Red-Staining Polypore (Amauroderma rude
Red-Staining Polypore (Amauroderma rude)
Red-Staining Polypore (Amauroderma rude) is a hard, stalked polypore native to tropical forests of Australia and Southeast Asia, identified by the blood-red stain its pore surface produces when touched. ouched. It decomposes buried dead wood as a saprotrophic fungus — not a parasite of living trees. It has attracted serious scientific attention for having the highest measured ergosterol content among five major medicinal mushrooms in a direct comparison study.
Sanguinoderma rude (Berk.) Y.F. Sun, D.H. Costa & B.K. Cui — Ganodermataceae — Polyporales
Red-Staining Polypore (Amauroderma rude) is one of those species that stops experienced mycologists in their tracks. Touch the white underside of the cap and it bleeds crimson — immediately, dramatically, and for no biochemically explained reason. The genus name Sanguinoderma, formally adopted in 2020, means "blood-skin" in Latin, a name earned by this very species. Beyond the spectacle, the scientific literature reveals something more surprising: crude extracts of this fungus outperformed Ganoderma lucidum across eleven cancer cell lines in a 2013 screening study, and its ergosterol content was measured higher than that of five major medicinal mushrooms tested side-by-side. The species is cultivable on prepared substrate, requires no living tree host, and is available as a liquid culture for those who want to work with it directly.
What Is the Red-Staining Polypore (Amauroderma rude)?
Red-Staining Polypore (Amauroderma rude) is a hard, woody-textured bracket fungus that grows on a central stalk — an unusual form among polypores, most of which grow directly from wood without a stipe. The cap reaches 3–10 cm across, is dark grayish-brown to nearly black at maturity, and has a non-glossy, velvety surface covered in fine radial wrinkles. It is not a gilled mushroom and is not fleshy in any culinary sense: the flesh is corky and resinous, more like a dried bracket than anything edible.
The species belongs to the family Ganodermataceae — the same family as the well-known reishi mushroom (Ganoderma lucidum) — but it lacks the lacquered, glossy surface that makes Ganoderma species so visually distinct. Amauroderma rude is dull-surfaced and brown, looking in the field like nothing particularly special, until the pore surface is disturbed.
That bruising reaction — white pore surface becoming blood-red within seconds of mechanical damage — is the defining field character not just for this species but for the entire genus Sanguinoderma, which was formally separated from Amauroderma in 2020 on the basis of molecular phylogenetic evidence. All 18+ species in Sanguinoderma share this red-bruising trait at the genus level. What makes Amauroderma rude specifically significant is that it is the type species for that genus — the biological reference point by which all other Sanguinoderma species are defined and compared.
Interested in this species? Out-Grow carries a liquid culture.
Red-Staining Polypore (Amauroderma rude) Liquid CultureHow Is Red-Staining Polypore (Amauroderma rude) Classified?
The taxonomy of Amauroderma rude is more complicated than a simple species entry suggests. The organism has three valid scientific names across its history, and understanding that history clarifies why different sources — scientific papers, databases, field guides — use different names for the same fungus.
| Rank | Name |
|---|---|
| Kingdom | Fungi |
| Division | Basidiomycota (spore-bearing fungi) |
| Class | Agaricomycetes |
| Order | Polyporales (bracket and polypore fungi) |
| Family | Ganodermataceae |
| Genus | Sanguinoderma Y.F. Sun, D.H. Costa & B.K. Cui (2020) |
| Species | Sanguinoderma rude (Berk.) Y.F. Sun, D.H. Costa & B.K. Cui |
The species was first described by Miles Joseph Berkeley in 1839, from a type specimen collected in Tasmania, Australia. Berkeley placed it in the catch-all genus Polyporus as Polyporus rudis — the basionym, or original name, that all subsequent combinations must acknowledge. Around 1900, Patouillard recombined it into the newly established genus Amauroderma, giving the name most familiar in the scientific literature: Amauroderma rude (Berk.) Pat.
That name dominated pharmacological and biochemical research from the 1990s through 2019. Virtually every published paper studying this species' anti-cancer or immunomodulatory properties uses Amauroderma rude. In 2020, a multi-gene phylogenetic study by Sun et al. published in the journal Persoonia demonstrated that Old World species with the blood-red bruising character form a distinct, monophyletic clade (evolutionary lineage) separate from the Neotropical Amauroderma sensu stricto. This justified erecting the new genus Sanguinoderma, with Amauroderma rude as its type species — becoming Sanguinoderma rude (MycoBank MB 828446) under the new combination.
| Name | Authority | Note |
|---|---|---|
| Polyporus rudis Berk. | Berkeley, 1839 | Basionym; type from Tasmania |
| Amauroderma rude (Berk.) Pat. | Patouillard, ~1900 | Name in virtually all pre-2020 research papers |
| Sanguinoderma rude (Berk.) Y.F. Sun et al. | Sun et al., 2020 | Current accepted name; type species of genus |
How Do You Identify Red-Staining Polypore (Amauroderma rude)?
In the field, Red-Staining Polypore (Amauroderma rude) presents as a dark brown, non-glossy, centrally stalked polypore growing at ground level, often appearing to emerge from soil but always arising from buried dead wood or root debris. The bruising test on the pore surface is the most useful identification character, but it is important to understand what it tells you and what it does not.
Young specimens are particularly distinctive: the growing margin of the cap is pale white or cream, and the pore surface is freshly white and quick to bleed red. As specimens age and dry, the cap darkens to near-black and the pore surface loses the vivid red response, turning brownish rather than blood-red when disturbed.
Lookalike Species
Sanguinoderma rugosum
The most frequently confused congener. Also bruises red. Distinguished by deeper concentric furrows on the cap (giving it its "rugosum" — wrinkled — name), clavate (club-shaped) cystidioles under the microscope, and slightly larger basidiospores (9.5–11.6 × 8–9.5 μm). More broadly distributed across Southeast Asia and Malaysia. Requires multi-gene molecular analysis to confirm in ambiguous specimens.
Sanguinoderma perplexum
Woodier and harder than S. rude; smaller and more densely packed pores (5–6 per mm vs. 3–4); spore surface has a distinctive vermiculate (worm-like) to semi-reticulate wall ornamentation with thick endospore spinules. Distinguishable by careful microscopy.
Ganoderma spp.
Superficially similar as woody, stalked or bracket polypores in the same family. Distinguished by the lacquered, high-gloss surface (laccate pileus) characteristic of Ganoderma, which Amauroderma rude entirely lacks. Ganoderma species also have truncate basidiospores with an apical pore and do not produce the red bruising reaction.
Amauroderma intermedium
Critical differentiator: the pore surface of A. intermedium does NOT change color when bruised. This is the single most reliable field character separating it from S. rude. Also restricted to Neotropical distribution, so geographic range alone is usually sufficient to exclude it outside South America.
Where Does Red-Staining Polypore (Amauroderma rude) Grow?
Red-Staining Polypore (Amauroderma rude) is a white rot saprotroph — a fungus that decomposes dead wood by enzymatically breaking down both lignin and cellulose, leaving behind bleached, soft, fibrous material. This is a critically important point for understanding the species: it requires no living tree partner. It grows entirely on dead, buried, or highly decayed wood, often appearing to emerge directly from soil when in fact its mycelium is attached to buried root fragments or stumps underground.
The species occupies tropical to subtropical regions of the Paleotropics and Oceania — the precise geographic pattern that distinguished the Sanguinoderma clade from its Neotropical Amauroderma relatives in the 2020 molecular phylogeny. In Australia, the Queensland Mycologist newsletter documents fruiting during warm, humid conditions. In tropical Asian settings, fruiting likely peaks during the wet season.
In China, wild populations have been reportedly depleted by overcollection for medicinal use. No formal IUCN conservation assessment has been conducted for this species, representing a gap in documented conservation status despite the ecological and pharmacological significance of the organism.
Can You Cultivate Red-Staining Polypore (Amauroderma rude)?
Red-Staining Polypore (Amauroderma rude) is cultivable on prepared substrate. Fruiting body production has been documented, patented, and implemented at commercial scale in China. Because the species is a white rot saprotroph — not mycorrhizal — there is no fundamental biological barrier to cultivation on dead lignocellulosic substrate. The full protocol is documented in Chinese patent CN103749151A (Guangdong Yuewei Edible Mushroom Technology Co. Ltd. / Guangdong Institute of Microbiology, 2013). The cultivation data below is derived from that patent and should be understood as patent-reported data, not independently peer-reviewed cultivation science.
The central challenge is patience. This species takes 105–115 days from inoculation to first harvest — far slower than oyster mushrooms (10–15 days spawn run) or even Ganoderma lucidum. The slow colonisation timeline extends the window of contamination vulnerability. However, the biology is straightforward: the mycelium colonises hardwood-based substrate, requires no symbiotic partner, and follows the well-understood Ganodermataceae fruiting pattern of CO₂-driven stipe elongation followed by cap development when CO₂ is reduced.
Cultivation Parameters
Mother Culture (PDA Slants)
Modified PDA: Potato 200 g/L, agar 20 g, glucose 20 g, KH₂PO₄ 3 g, MgSO₄ 1.5 g. Sterilise at 121°C / 20 min. Incubate at 25°C in darkness until mycelium covers slant (~7 days).
Original Seed Bags
78% sorghum + 20% millet + 2% CaCO₃; 60% water content; 13×25 cm PP bags (~300 g dry). Inoculate from mother culture. Incubate 25°C, dark, ~20 days to full colonisation.
Production Seed Bags
89% cottonseed hulls + 10% wheat bran + 1% CaCO₃; 55% water; 15×30 cm bags. Or: 45–55% cottonseed hulls + 25–35% sawdust + 15–20% wheat bran + 1–2% CaCO₃. Incubate 25°C, dark.
Fruiting Bags
30% cottonseed hulls + 58% sawdust + 10% wheat bran + 2% CaCO₃; 60% water; 17×35 cm bags. Full colonisation takes 30–35 days. Post-ripening rest: 15 days before fruiting trigger.
Primordia Initiation
25°C ± 1; 85–90% RH; 100–200 lux light; 2000–3000 ppm CO₂. High CO₂ drives stipe elongation (etiolation) — the same CO₂ response seen in Reishi cultivation.
Cap Development & Harvest
Drop CO₂ to 300–1200 ppm. Maintain 90–95% RH; 200–300 lux; 25°C. Harvest when white growing margin at cap edge turns fully gray-black. First harvest ~105–115 days post-inoculation.
| Parameter | Value | Source |
|---|---|---|
| Optimal temp (all stages) | 25°C (77°F) | Patent CN103749151A |
| Spawn run humidity | 60–70% RH | Patent CN103749151A |
| Fruiting humidity | 85–95% RH | Patent CN103749151A |
| Primordia CO₂ | 2000–3000 ppm | Patent CN103749151A |
| Cap growth CO₂ | 300–1200 ppm | Patent CN103749151A |
| Total cycle time | 105–115 days | Patent CN103749151A |
| Yield per bag (fresh) | 30–40 g | Patent CN103749151A |
| Biological efficiency | ~10–20% | Patent CN103749151A |
| pH optimum | 5.0–5.6 (weakly acidic) | Substrate formulation data |
| Agar growth rate | ~0.432 cm/day (RFC strain) | Patent CN112673900A |
Working with Amauroderma rude Liquid Culture
Out-Grow's 12cc liquid culture syringe contains viable Amauroderma rude mycelium ready for transfer to PDA agar or sterilized grain spawn. Liquid culture is the starting point for the full cultivation protocol: use it to inoculate mother culture slants or seed bags directly, bypassing the need for agar transfers if working at scale. On agar, expect cream-colored mycelium that gradually develops tan and brown tones as the colony matures — consistent with other Ganodermataceae on culture media. The culture also serves as a preserved research strain for laboratory study of the species' bioactive chemistry, hyphal morphology, or bruising reaction mechanism.
View Liquid Culture →What Bioactive Compounds Does Red-Staining Polypore (Amauroderma rude) Contain?
Red-Staining Polypore (Amauroderma rude) has been the subject of a focused cluster of pharmacological research, primarily from the Guangdong Institute of Microbiology between 2013 and 2015. Three compound classes have been studied, with a fourth identified structurally but not yet tested for biological activity. All current evidence is pre-clinical — in vitro (cell culture) or animal model only. There are no human clinical trials for any compound from this species.
Ergosterol
In Vitro + AnimalIsolated from 10 kg dry fruiting bodies via ethanol extraction and silica gel chromatography. Amauroderma rude contained 2.58 mg/g dry weight — the highest of five medicinal mushrooms tested directly side-by-side (G. sinense, G. lucidum, G. tsugae, Coriolus versicolor). In vitro: dose-dependent death in five breast cancer cell lines at 50–100 μM; little cytotoxicity in normal fibroblasts at the same doses. In vivo B16 melanoma mouse model (IP injection): ergosterol group mean survival 10.9 weeks vs. control 5.3 weeks (log-rank p<0.01). Mechanism: Foxo3 upregulation activating both intrinsic (mitochondrial) and extrinsic (death receptor) apoptotic pathways.
Polysaccharide F212
In Vitro + AnimalLow-molecular-weight heteropolysaccharide (Mw ~5.9 kDa) purified from hot water extract of fruiting bodies. Monosaccharide composition includes glucose, galactose, mannose, arabinose, xylose, rhamnose, and ribose. In vitro: stimulates macrophage proliferation; increases NK cell killing of breast cancer cells; upregulates IL-2 and TNF-α. In vivo 4T1 tumor model: fraction F0.5 significantly inhibited tumor growth from Day 20 onward. Acute mouse LD50: >15,000 mg/kg (essentially non-toxic at tested doses). Mechanism is immunomodulatory (indirect), complementary to ergosterol's direct cytotoxicity.
c-Myc Suppression (Crude Extract)
In Vitro + AnimalThe 2013 Jiao et al. screening study (PLoS ONE, PMCID PMC3688780) found crude water/ethanol extracts of A. rude showed the highest anti-cancer activity of 13 medicinal mushrooms tested across 11 cancer cell lines — outperforming Ganoderma lucidum at equivalent concentrations. Mechanism: suppression of the c-Myc oncogene (a protein that drives cancer cell proliferation). Animal model: reduced tumor size and increased apoptosis in athymic nude mice bearing MDA-MB-231 xenografts. The active compound responsible for direct cytotoxicity was subsequently identified as ergosterol.
Amaurolignan A
Structural OnlyA new pericarbonyl lignan (a class of plant and fungal phenolic compounds) isolated from 40 kg dry fruiting bodies collected in Yunnan, China, 2017. Named amaurolignan A — the first compound described as novel to this species. Structure confirmed by NMR and MS. No bioactivity data has been published. Two co-isolated known lignans were also identified. The biological significance of amaurolignan A is entirely unknown and represents the most tractable open chemistry question about this species.
Is Red-Staining Polypore (Amauroderma rude) Safe?
Red-Staining Polypore (Amauroderma rude) is not a food mushroom. The fruiting body is corky, woody, and not consumed fresh. It has been used historically in Chinese traditional medicine as a decoction or dried extract — consumed by boiling and straining, not by eating the tissue directly. It is described in classical TCM references as "ping (neutral), gan (sweet), non-toxic," used for applications including reducing blood stasis and promoting urination.
No peer-reviewed case reports of human toxicity or poisoning attributed to this species have been published. The crude extract acute mouse LD50 is reported at over 15,000 mg/kg — placing it in the "practically non-toxic" category under standard toxicological classification at the tested doses. However, this single data point represents the entire formal human-safety evidence base. There have been no human clinical trials, dose-escalation studies, drug interaction studies, or long-term safety assessments for this species in any form.
What Makes Red-Staining Polypore (Amauroderma rude) Remarkable?
Several features of Red-Staining Polypore (Amauroderma rude) stand out even within the notably interesting family Ganodermataceae. Most are not widely known outside specialist mycology.
Type Species of a Newly Named Genus
Sanguinoderma rude is the type species for the genus Sanguinoderma — the reference specimen by which the genus is formally defined. Every new species described in Sanguinoderma (and three were described in 2025) is compared to this species as the biological anchor. This nomenclatural significance is not shared by any of its 18+ congeners.
Highest Ergosterol Content Among Medicinal Mushrooms
At 2.58 mg/g dry weight, the ergosterol content measured in A. rude fruiting bodies exceeded that of Ganoderma sinense, G. lucidum, G. tsugae, and Coriolus versicolor in a direct comparison. Ergosterol is a precursor to vitamin D₂ and has intrinsic biological activity beyond its membrane role. If this measurement is reproducible across strains and growing conditions — which has not yet been independently confirmed — it would represent a genuine distinguishing biochemical character for this species.
Outperformed Reishi in Anti-Cancer Screening
The 2013 Jiao et al. study (PLoS ONE) screened 13 medicinal mushrooms across 11 cancer cell lines. Crude A. rude extract showed higher cytotoxicity than Ganoderma lucidum at equivalent concentrations — a striking result given that reishi is one of the most studied medicinal fungi on Earth. This finding has not been independently replicated and comes from a single research group. Whether it reflects genuinely superior bioactivity or differences in extract preparation methodology remains open.
The Blood-Red Bruising Chromophore Is Unidentified
The most visually spectacular feature of the species — the instant blood-red bruising of the pore surface — has no confirmed biochemical explanation as of 2026. No published study has identified the chromogenic compound or the enzyme responsible. Whether the red chromophore is the same molecule across all 18+ Sanguinoderma species or varies by species is entirely unknown. This is one of the most tractable and visually compelling open chemistry questions in mycology: a GC-MS or LC-MS study of fresh tissue before and after bruising could resolve it.
Tasmania to Tropical Asia: A Biogeographic Puzzle
The type specimen is from Tasmania (1839). The species is also distributed across tropical Southeast Asia and southern China. How the same organism occupies both temperate southern Australia and the humid tropics of Asia — separated by thousands of kilometers — has never been studied at the population genetics level. The Australian and Asian populations may represent the same species by morphological criteria while having diverged genetically in ways relevant to their pharmacological and cultivation characteristics.
Also available as a culture plate from Out-Grow.
Red-Staining Polypore (Amauroderma rude) Culture PlateFrequently Asked Questions About Red-Staining Polypore (Amauroderma rude)
What causes the red-staining reaction in Amauroderma rude?
The honest answer is that no one knows yet. The instant blood-red color that appears when the white pore surface is bruised or scratched is the defining character of the entire genus Sanguinoderma, but the specific chromogenic compound and the enzyme driving the reaction have not been identified in any published study. The reaction occurs within seconds, suggesting an enzymatic oxidation process — likely involving a phenolic substrate and a polyphenol oxidase or laccase — but this remains unconfirmed. It is one of the most visually striking open research questions in mycology.
Is Amauroderma rude the same as Sanguinoderma rude?
Yes — these are the same organism. A 2020 molecular phylogenetic revision by Sun et al. transferred the species from the genus Amauroderma to the newly established genus Sanguinoderma, making Sanguinoderma rude the current accepted name under Index Fungorum and MycoBank. However, virtually all pharmacological and biochemical research published before 2020 uses the older name Amauroderma rude, which is why it remains the more useful search term for finding scientific literature on this species.
Can you grow Red-Staining Polypore at home?
It is cultivable but demanding. The full cycle takes 105–115 days from inoculation to first harvest — much longer than common cultivated species. It requires a hardwood-based substrate (sawdust and cottonseed hulls), careful humidity management during fruiting (85–95% RH), and a specific CO₂ management protocol: high CO₂ (2000–3000 ppm) drives stipe elongation, then CO₂ must be reduced (300–1200 ppm) to trigger cap development. A liquid culture or culture plate is the starting point for any cultivation attempt.
Is Amauroderma rude edible?
No. The fruiting body is woody and corky in texture — not edible in any culinary sense. It is listed as "unknown or inedible" in mycological databases and is not consumed as fresh mushroom food anywhere. It has been used in Chinese traditional medicine as a dried extract or decoction (boiled and strained), described as neutral in character and non-toxic in traditional texts. However, there is no formal human safety or toxicology data beyond a single acute mouse LD50 value.
How does Amauroderma rude compare to Reishi (Ganoderma lucidum)?
Both belong to the family Ganodermataceae and both have been studied for anti-cancer properties, but they are distinct organisms with different morphology and research profiles. A 2013 screening study found crude A. rude extract outperformed G. lucidum across eleven cancer cell lines at equivalent concentrations — a result that has attracted scientific interest but has not been independently replicated. Amauroderma rude also measured higher in ergosterol content than G. lucidum in a direct comparison. Reishi has a much larger body of research and is far more widely cultivated; A. rude remains at the pre-clinical research stage.
What is the difference between Amauroderma rude and Amauroderma rugosum?
These are closely related but distinct species. Amauroderma rugosum (now Sanguinoderma rugosum) is the focus of Malaysian traditional medicine research on anti-epileptic effects — research that does not apply to A. rude, which has a different pharmacological profile. Morphologically, A. rugosum has more deeply wrinkled concentric furrows on the cap, slightly larger spores, and clavate cystidioles absent in A. rude. Both species share the blood-red bruising reaction. Reliable separation in ambiguous specimens requires microscopy and ideally molecular analysis.