Brat Oyster Mushroom (Pleurotus ostreatus)
Brat Oyster Mushroom (Pleurotus ostreatus)
Brat Oyster Mushroom (Pleurotus ostreatus) is a wood-decomposing fungus native to temperate forests worldwide. It is the second most commercially cultivated mushroom on Earth, prized for its meaty texture, mild flavor, and one of the most studied chemistry profiles in the edible mushroom world. Beneath the culinary reputation lies genuinely remarkable biology: this mushroom is also a carnivore, a potent environmental remediator, and the subject of active human clinical trials.
Pleurotus ostreatus (Jacq.) P. Kumm. — Pleurotaceae — Agaricales
Brat Oyster Mushroom (Pleurotus ostreatus) is arguably the most accessible of all cultivated fungi: fast-growing, substrate-tolerant, cold-adapted, and capable of converting straw, cardboard, or spent coffee grounds into abundant flushes of edible fruiting bodies. First formally described by botanist Nikolaus Jacquin in 1774 and placed in its current genus by German mycologist Paul Kummer in 1871, this species has since become the cornerstone of mushroom cultivation in China, Europe, and North America — accounting for millions of metric tons of annual production worldwide.
Interested in this species? Out-Grow carries a liquid culture.
Brat Oyster Mushroom (Pleurotus ostreatus) Liquid CultureWhat Is the Brat Oyster Mushroom (Pleurotus ostreatus)?
The Brat Oyster Mushroom (Pleurotus ostreatus) gets its common name from the shape of its cap — broadly fan-shaped or semicircular, resembling the shell of an oyster — and from its slightly slippery surface texture. The Latin epithet ostreatus means "of an oyster," while pleurotus means "side-ear," referencing how the cap attaches laterally to wood rather than on a central stem like a button mushroom.
What makes this species biologically extraordinary is its trophic versatility. The Brat Oyster Mushroom (Pleurotus ostreatus) decomposes dead hardwood through a sophisticated enzyme arsenal — laccases, manganese peroxidase, and lignin peroxidase — that dismantles both lignin and cellulose simultaneously. This "white rot" mechanism is precisely what enables it to grow on nearly any lignocellulosic (wood-fiber-based) substrate without a living host, a soil amendment, or any symbiotic partner species.
Beyond decomposition, the Brat Oyster Mushroom (Pleurotus ostreatus) is one of the few verified carnivorous fungi on Earth — a fact confirmed at the mechanistic level only in 2023. Its hyphae develop specialized toxin-loaded structures that paralyze and kill soil nematodes (microscopic roundworms), extracting nitrogen from the dead animals to supplement what wood alone cannot provide. The same volatile compound responsible for this predatory behavior also contributes to the mushroom's fresh aroma.
The Brat Oyster Mushroom (Pleurotus ostreatus) also presents a taxonomic complexity rarely communicated to general audiences: what we commonly call the "oyster mushroom" is in fact a species complex — a cluster of genetically distinct but morphologically similar lineages. A landmark 2020 molecular study identified 20 phylogenetic species within the complex, at least 7 of which remain formally unnamed. This matters for pharmaceutical research, where compound profiles may differ between lineages, but rarely for cultivation or culinary use.
How Is Brat Oyster Mushroom (Pleurotus ostreatus) Classified?
| Rank | Name |
|---|---|
| Kingdom | Fungi |
| Phylum | Basidiomycota |
| Class | Agaricomycetes |
| Order | Agaricales |
| Family | Pleurotaceae |
| Genus | Pleurotus |
| Species | Pleurotus ostreatus (Jacq.) P. Kumm. |
| MycoBank / NCBI ID | NCBI Taxonomy ID: 5322 · MeSH: D020076 |
The Brat Oyster Mushroom (Pleurotus ostreatus) was first described as Agaricus ostreatus by Jacquin in 1774 — at that time, Agaricus was used as a catch-all genus for virtually all gilled fungi. In 1871, Paul Kummer erected the genus Pleurotus and transferred the species to its accepted name. The most closely related genus is Hohenbuehelia, a small group of pleurotoid fungi that together with Pleurotus form the core of family Pleurotaceae.
Notable synonyms include Agaricus ostreatus Jacq. (the basionym), Pleurotus columbinus Quél. (the cold-temperature blue-gray form once treated as a separate species), and Pleurotus salignus (the willow-substrate form). All are now treated as phenotypic variants of a single species. The degree of morphological plasticity — cap color shifting from near-white to deep blue-gray based on temperature — is precisely what led 19th-century taxonomists to describe the same fungus multiple times.
How Do You Identify Brat Oyster Mushroom (Pleurotus ostreatus)?
Key Morphological Features
The Brat Oyster Mushroom (Pleurotus ostreatus) grows in overlapping shelf clusters on wood — a habit that is in itself a strong identification cue. No ring (annulus) or cup (volva) is present. The spore print is white to lilac-gray; viewing it on dark paper reveals the pale lavender tint that is absent in many lookalikes. The odor is typically described as faintly pleasant — primarily driven by C8 volatile compounds including 1-octen-3-ol (the characteristic "mushroom" scent) — rather than the "bitter almond" scent sometimes attributed to it in popular literature (see Chemistry section).
Lookalike Species
Pleurotus pulmonarius — Phoenix Oyster
Edible and closely related. Cap pale to white-beige, rarely darkening. Appears in warmer weather (spring–fall). KOH on cap surface turns orangish — a useful field test. Spores slightly narrower (7–11 × 2–3 µm). Cannot be reliably separated by ITS DNA barcoding alone.
Pleurotus populinus — Aspen Oyster
Edible. Nearly identical macroscopically. Grows almost exclusively on Populus species (aspen, cottonwood). Substrate is the primary separator in the field. Spring through fall.
Hohenbuehelia petaloides
Edible but worthless for eating. Much smaller (1–5 cm), single caps rather than clustered, with remnants of a gelatinous partial veil. Not growing in shelf clusters.
Phyllotopsis nidulans — Hairy-Capped Oyster
Inedible. Yellow-orange cap and gills; strongly fetid odor. Cannot be confused with a fresh oyster mushroom by anyone who has smelled both.
Omphalotus nidiformis — Ghost Fungus
Toxic. Australia and parts of Asia only — not present in Europe or North America. Orange-yellow tones; gills run further down stem; bioluminescent in complete darkness. European equivalent of concern is Omphalotus olearius (olive jack-o'-lantern), but P. ostreatus does not grow on olive stumps.
Pleurocybella porrigens — Angel Wings
Possibly toxic. Pure white, grows on dead conifer wood (especially hemlock), no stipe, very thin flesh. Cluster habit similar but wood substrate is diagnostic — oyster mushrooms strongly prefer hardwoods.
Where Does Brat Oyster Mushroom (Pleurotus ostreatus) Grow?
The Brat Oyster Mushroom (Pleurotus ostreatus) is a saprotrophic (decomposing) white-rot fungus that colonizes dead or damaged hardwood. It shows strong preference for beech (Fagus sylvatica) in European contexts, and grows on birch, elm, oak, willow, maple, aspen, and poplar throughout its range. It occasionally colonizes conifers but with reduced productivity. It is also a facultative wound parasite — capable of colonizing living trees through bark injuries and causing slow progressive decay of the sapwood, though this rarely kills the host tree.
| Region | Season | Notes |
|---|---|---|
| Temperate Europe | October–March | Frost-triggered; one of the few fungi fruiting in winter; beech the primary host |
| United Kingdom | November–March | Peak after first frosts; old beech woodland most productive |
| North America (eastern) | Spring–Fall | Often P. pulmonarius or P. populinus; complex not fully sorted biogeographically |
| California coast | Year-round, seasonal peak | "Fog flora" component; associated with coastal conditions |
| East Asia (China, Japan) | Autumn–winter | Primary commercial producer globally; widespread in temperate forests |
| Africa / South America | Variable | Present; complex biogeographic origin involving multiple dispersal events from East Asian ancestors ~39 million years ago |
The Brat Oyster Mushroom (Pleurotus ostreatus) plays a critical ecological role as a primary wood decomposer in temperate forests — converting lignin (one of the most chemically resistant biopolymers on Earth) back into plant-available carbon and CO₂. No conservation concern: the species is widespread, abundant, and not formally assessed by the IUCN but considered Least Concern by all accounts. It is not listed as invasive in any jurisdiction.
Can You Cultivate Brat Oyster Mushroom (Pleurotus ostreatus)?
Yes — emphatically. The Brat Oyster Mushroom (Pleurotus ostreatus) is one of the most cultivatable fungi known to science. Its saprotrophic lifestyle means it requires no living host, no soil, no mycorrhizal partner tree, and no specialized chamber. It grows on virtually any lignocellulosic (wood-fiber-based) waste material, colonizes rapidly, and produces multiple flushes. China alone accounts for more than 85% of global oyster mushroom production, with the species ranking second only to the button mushroom (Agaricus bisporus) by volume worldwide.
Substrate and Biological Efficiency
Biological efficiency (BE) expresses yield as a percentage of substrate dry weight. A 100% BE means 1 kg of fresh mushroom per 1 kg of dry substrate — a useful benchmark for comparing substrates.
| Substrate | Biological Efficiency | Notes |
|---|---|---|
| Wheat straw | ~91–119% | Baseline commercial substrate; widely used globally |
| Wheat straw + spent brewery grains (70:30) | Highest in comparative studies | Best balance of yield, colonization speed, and cost |
| Mixed agricultural residues (tef/barley/wheat straw + legume husks) | Up to 238% | Highest documented BE; mixed waste streams |
| Cotton seed hulls / corn straw / sugarcane bagasse | 70–140% | Widely used in Asian commercial production |
| Hardwood sawdust | Moderate to high | Longer colonization; hardwood preferred over softwood |
| Coffee grounds | Moderate | Popular in hobbyist cultivation; readily available |
| Cardboard | Low but viable | Slow; effective for experimental and urban cultivation |
Substrate moisture content should be adjusted to approximately 60–70% after pasteurization — the "field capacity" point where water drips briefly when a handful is squeezed but stops quickly. The optimal C:N (carbon-to-nitrogen) ratio is 40–60:1. Nitrogen supplementation with wheat bran, rice bran, or soybean hulls substantially improves yields but increases contamination risk from competing organisms.
Spawn Run Conditions
Fruiting Conditions
Temperature Drop
Reduce temperature 5–10°C below spawn run temp. Cold-adapted strains pin best at 15–18°C; warm strains at 20–24°C. This temperature drop mimics the autumn shift that triggers fruiting in the wild.
Fresh Air Exchange (FAE)
Reduce CO₂ to below 1,000 ppm (ideally 500–800 ppm). Increasing FAE (fresh air exchange) is the single most important environmental change for pin initiation. Without it, mycelium may remain stalled post-colonization.
High Humidity
Maintain 90–95% relative humidity during fruiting. Critical for pin formation and cap development. Drying conditions cause aborted pins and thin, wavy caps.
Directional Light
800–1,500 lux of diffuse light helps guide cap orientation and development. Light is not required for pinning itself but improves cap formation quality.
Harvest Timing
Harvest before cap margins fully flatten — caps curl upward slightly when overripe and spore release begins. Heavy sporulation in enclosed spaces is an occupational health concern.
Multiple Flushes
Oyster mushrooms typically yield 2–4 commercial flushes per block. Rest periods of 5–10 days between flushes allow the substrate to recover. First and second flushes account for the majority of total yield.
Contamination: The Primary Risk
Trichoderma spp. (green mold) — specifically T. pleuroticola and T. harzianum — represent the primary contamination threat in oyster mushroom cultivation, capable of causing up to 70% yield loss when present. Paradoxically, hot-water pasteurization at 60–80°C for 30 minutes is preferred over full autoclave sterilization at 121°C for most substrate types: the sterilization process eliminates beneficial bacteria that naturally suppress Trichoderma, making sterilized substrate more vulnerable, not less.
Agar and Liquid Culture Performance
On potato dextrose agar (PDA), the Brat Oyster Mushroom (Pleurotus ostreatus) produces white, cottony to densely rhizomorphic colonies growing at 9–15 mm/day depending on strain (up to ~19 mm/day in some studies). PDA is the optimal solid medium for most strains; malt extract agar (MEA) performs adequately; MEA is typically the worst performer. Optimal agar temperature is 25–28°C. Significant strain-to-strain variation exists — the best practice is to record which medium and temperature combination yields the fastest, cleanest linear growth for your specific isolate.
What Out-Grow's Liquid Culture Contains
Out-Grow's Brat Brat Oyster Mushroom (Pleurotus ostreatus) liquid culture is an actively growing suspension of mycelium in sterile nutrient solution — ready to inoculate grain spawn, sterilized hardwood sawdust blocks, straw-based substrates, or fresh agar plates.
Liquid spawn advantages over agar transfers include faster and more homogeneous substrate colonization, lower contamination risk when produced under aseptic conditions, and compatibility with automated or high-volume inoculation workflows. The Brat strain produces bright white, cottony to highly rhizomorphic mycelium with fast, radial growth on MEA, typically colonizing a 100mm plate in 4–7 days at optimal temperature.
Use within the recommended window from production and store at refrigerator temperature until use. Inoculate sterilized grain at approximately 10 mL per 4 lb bag for best results.
What Bioactive Compounds Does Brat Oyster Mushroom (Pleurotus ostreatus) Contain?
The Brat Oyster Mushroom (Pleurotus ostreatus) has one of the more thoroughly characterized compound profiles among edible fungi, though significant gaps and methodological controversies remain. The chemistry is distributed across the fruiting body, mycelium, and culture filtrate — and compound concentrations vary substantially with strain, substrate, developmental stage, and analytical method.
β-(1→3/1→6)-D-Glucan (Pleuran)
The most pharmacologically characterized compound from this species. Insoluble β-glucan isolated from fruiting body and mycelium (~23.9% dry matter in raw fruiting body). The specific pleuran fraction is the active ingredient in several respiratory immune supplements with randomized controlled trial evidence in children and athletes.
Lovastatin (Mevinolin)
HMG-CoA reductase inhibitor also found in red yeast rice and Aspergillus terreus. Reported in P. ostreatus at levels from undetectable (HPLC, one study) to 600+ µg/g (other studies). The enormous range reflects strain, substrate, developmental stage, and analytical method differences. Should not be presented as consistently present at pharmacologically relevant doses.
Phenolic Compounds
Total polyphenols: ~487 mg GAE/100g dry matter in fruiting body (Folin-Ciocalteu). Specific compounds identified include gallic acid, protocatechuic acid, chlorogenic acid, naringenin, hesperetin, and biochanin-A. Mycelial ethanol extracts show DPPH free-radical inhibition of 31–61% (strain-dependent).
Ergothioneine
Naturally occurring thio-imidazole amino acid found specifically in fungi, with antioxidant, antidiabetic, and neuroprotective properties under investigation. P. ostreatus is particularly ergothioneine-rich. The OYSCOG trial (NCT06846827) is currently evaluating cognitive outcomes in adults 60+ consuming oyster mushrooms 4× per week for 12 weeks.
3-Octanone (Nematicidal Volatile)
The primary toxin stored in hyphal toxocysts. Disrupts nematode cell membrane integrity by triggering extracellular calcium influx, causing neuronal cell death within minutes. Also one of the main fresh aroma compounds. In vitro nematode mortality exceeds 88% at 48 hours and 95% at 72 hours at documented concentrations.
Triterpenoids (Ergostane-Type)
Multiple tetracyclic triterpenoids isolated from fruiting body, mycelium, and culture broth, including ergost-2,5,7,9(11),22-pentaene and astragaloside (0.13% content). Structurally distinct from Ganoderma ganoderic acids. Specific bioactivities in P. ostreatus less well-characterized than the polysaccharide fraction.
Antimicrobial Volatiles (1-Octen-3-ol, C8 Complex)
Mixed VOC fraction shows complete inhibition of 8 bacterial test strains in culture broth assays. The primary aroma constituent 1-octen-3-ol (produced via the lipoxygenase pathway) is both the characteristic mushroom scent compound and an antimicrobial agent — an in vitro result with no demonstrated clinical pathway.
Lectins
Immunomodulatory lectins that interact with cell-surface glycoproteins through different mechanisms than β-glucans. Characterized as distinct from the polysaccharide fraction and operating via different immune pathways. Characterization lags significantly behind the β-glucan and phenolic compound research.
Is Brat Oyster Mushroom (Pleurotus ostreatus) Safe to Eat?
The Brat Oyster Mushroom (Pleurotus ostreatus) is among the safest edible fungi known, with no intrinsic toxic compounds and a consumption record spanning centuries across Europe, Asia, and North America. No toxic poisoning from properly identified specimens has been documented in the literature. Given that this species is consumed hundreds of millions of times globally each year in commercial settings, the absence of toxicity reports constitutes meaningful safety evidence — not simply an absence of data.
However, the Brat Oyster Mushroom (Pleurotus ostreatus) is an established allergen in specific exposure contexts:
Spore inhalation (occupational risk): Indoor cultivators face genuine risk of hypersensitivity pneumonitis (extrinsic allergic alveolitis) from sustained exposure to oyster mushroom spores. A 1988 study documented four mushroom workers developing this condition, with symptom reproduction on controlled spore challenge. A separate case report describes full anaphylaxis in a farm worker after 30-minute packing exposure. The allergen "Pleo," found on spore surfaces, is described as potent. Grow room ventilation and air filtration during fruiting and harvest are practical mitigations.
Ingestion allergy (rare): A 2023 case report — described by its authors as the first confirmed oral food challenge-verified case — documents a 12-year-old patient developing urticaria, angioedema, and anaphylaxis from oyster mushroom soup. Trehalose phosphorylase was identified as a novel potential allergen. Cross-reactivity with shiitake and enoki mushrooms was also observed. This remains an isolated documented case; general population ingestion allergy appears extremely rare.
Drug interaction note: The theoretical concern about lovastatin content interacting with pharmaceutical statins exists but is substantially mitigated by the highly inconsistent presence of lovastatin across strains. Patients on statin medications consuming large quantities of oyster mushroom supplements should consult a physician as a precaution.
What Makes Brat Oyster Mushroom (Pleurotus ostreatus) Remarkable?
A Mushroom That Hunts
The Brat Oyster Mushroom (Pleurotus ostreatus) is a verified carnivorous fungus — one of the very few organisms outside the plant kingdom known to actively trap and consume animals. Wood is nitrogen-poor, and the species supplements its diet by paralysing and killing soil nematodes (microscopic roundworms). The mechanism, fully characterized in a landmark 2023 Science Advances study, is described by the researchers as a "nerve gas in a lollipop" strategy: fungal hyphae develop specialized structures called toxocysts — tiny, lollipop-shaped cells attached by a narrow stalk — loaded with concentrated 3-octanone. When a nematode makes contact, the toxocyst ruptures and releases 3-octanone as a gas in close proximity to the animal's body. The compound disrupts cell membrane integrity, triggering rapid calcium influx that causes neuronal cell death throughout the nematode's body within minutes. The paralyzed worm is then colonized by the fungal hyphae, which extract nitrogen-rich nutrients from the dead animal. This behavior likely evolved as a nitrogen-acquisition adaptation in wood substrates where nitrogen is scarce. It also has practical implications: P. ostreatus shows in vitro mortality rates above 88% against root-knot nematodes (Meloidogyne spp.) at 48 hours — suggesting potential as a biological control agent for one of agriculture's most destructive soil pests.
A 634-Enzyme Wood-Dismantling Machine
The Brat Oyster Mushroom (Pleurotus ostreatus) harbors 634 carbohydrate-active enzyme (CAZyme) genes — one of the most expansive enzyme arsenals of any studied mushroom, confirmed in the most recent 2025 chromosome-level genome assembly. Unlike brown-rot fungi, which skip lignin and only degrade cellulose, P. ostreatus degrades both lignin and cellulose simultaneously through laccases, manganese peroxidase, and lignin peroxidase, leaving a characteristically white, fibrous residue. This enzymatic breadth makes it the most studied white-rot organism for mycoremediation — the use of fungi to clean contaminated environments. Documented applications include 55% reduction of total petroleum hydrocarbons in contaminated soil over 30 days, biosorption of lead (9–189 mg/g) and cadmium (1–21 mg/g), and effective treatment of industrial food-processing wastewater.
Ancient Origin, Intercontinental Journey
Molecular clock analyses place the origin of the P. ostreatus species complex at approximately 39 million years ago in East Asia (late Eocene epoch). From there, the complex dispersed globally through multiple independent events across the Bering and North Atlantic land bridges and by long-distance wind dispersal — arriving independently in Europe, North America, Africa, and South America at different geological moments. This ancient East Asian origin explains the concentration of genetic diversity in wild Asian populations and the relatively narrower genetic base of European and North American cultivation stocks. The related king oyster mushroom group (P. eryngii) diverged from the ostreatus lineage as recently as 6 million years ago, when some populations transitioned from wood decomposition to Apiaceae herb specialization — explaining why both cultivate on similar substrates despite fruiting on entirely different wild hosts.
A Species Complex Hidden in Plain Sight
What the world calls "oyster mushroom" is not a single species in any rigorous genomic sense. A 2020 multilocus study using 40 nuclear single-copy orthologous genes from globally sampled specimens identified 20 phylogenetically distinct species within the P. ostreatus complex — at least 7 of which remain formally unnamed and undescribed. The ITS DNA barcode used in most identification databases has insufficient resolution to distinguish between lineages: intra-isolate ITS variation within P. ostreatus can reach 1.35%, and 22 distinct ITS types exist within a single study's sample. For cultivation and culinary use, this makes essentially no difference. For pharmaceutical research quantifying compound profiles — particularly β-glucan fractions or lovastatin content — the lineage matters considerably, since bioactive compound production may differ systematically between what appear to be identical specimens.
Frequently Asked Questions About Brat Oyster Mushroom (Pleurotus ostreatus)
What substrate is best for growing Brat Oyster Mushroom (Pleurotus ostreatus)?
Wheat straw is the most widely used commercial substrate, typically delivering 91–119% biological efficiency. Mixing wheat straw with spent brewery grains (70:30 ratio) consistently produces the highest yields in comparative studies, combining good colonization speed with nitrogen enrichment. For hobbyist cultivation, pasteurized straw, hardwood sawdust, or spent coffee grounds all work well. The key parameters are moisture content at 60–70%, C:N ratio around 40–60:1, and pasteurization rather than sterilization for most substrate types.
How do you trigger pinning in Brat Oyster Mushroom (Pleurotus ostreatus)?
The two primary triggers are a temperature drop of 5–10°C below spawn run temperature and a dramatic increase in fresh air exchange (FAE) to reduce CO₂ from spawn run levels (~10,000–20,000 ppm) to below 1,000 ppm. High relative humidity (90–95%) must be maintained throughout fruiting. These conditions mimic the natural autumn environmental shift that triggers wild fruiting in temperate regions. Without adequate FAE, colonized blocks may remain stalled even at correct temperature.
Is Brat Oyster Mushroom (Pleurotus ostreatus) the same as the "grey oyster" or "pearl oyster"?
"Grey oyster mushroom" and "pearl oyster mushroom" are common names for P. ostreatus, used particularly in commercial contexts and British English. All three names refer to the same species. Cap color in P. ostreatus ranges from cream-white (warm conditions) to deep blue-gray (cold conditions) — a temperature-dependent color response within a single species, not different varieties requiring different cultivation approaches.
What is the difference between Brat Oyster Mushroom (Pleurotus ostreatus) and Pleurotus pulmonarius?
Pleurotus pulmonarius (Phoenix oyster or summer oyster) is a close sister species that cannot be reliably distinguished from P. ostreatus by appearance alone. Key practical differences: P. ostreatus is cold-adapted and prefers autumn–winter conditions; P. pulmonarius is warm-adapted and fruits in warmer weather. The cap of P. pulmonarius rarely darkens to the blue-gray typical of cold-grown P. ostreatus. A KOH reaction on the cap surface (orangish in P. pulmonarius) helps in the field. DNA barcoding with ITS alone cannot reliably separate them — RPB2 must be added.
What health benefits does Brat Oyster Mushroom (Pleurotus ostreatus) have?
The strongest documented evidence involves the β-glucan fraction (pleuran): randomized controlled trials in children show reduced frequency of respiratory tract infections with pleuran supplementation; similar trials in athletes show improved cellular immune parameters. Multiple human trials suggest possible cholesterol and triglyceride reduction, though all are rated low quality by systematic reviewers due to methodological limitations. Ergothioneine content is under investigation for cognitive and metabolic benefits in an ongoing 2025 clinical trial. The distinction between in vitro, animal, and human evidence matters: most compound-specific claims for P. ostreatus remain at the in vitro level.
What is a liquid culture used for in Brat Oyster Mushroom (Pleurotus ostreatus) cultivation?
Liquid culture provides a suspension of actively growing mycelium in sterile nutrient solution, used primarily as spawn to inoculate grain bags, straw columns, or sawdust blocks. Advantages over agar-wedge transfers include faster and more uniform substrate colonization, lower contamination risk when produced under aseptic conditions, and straightforward scaling for larger production runs. Liquid spawn is not a fruiting substrate — it transfers viable mycelium to the substrate where fruiting will occur.
Also available as a culture plate from Out-Grow.
Brat Oyster Mushroom (Pleurotus ostreatus) Culture Plate