Agaricales » Cystostereaceae


Effusomyces Yue Li, Nakasone & S.H. He 2022, in Li, et al., Journal of Fungi, 8, 1229 (2022)

Etymology: refers to the broadly effused fruitbody

Diagnosis: Basidiomes annual, resupinate, effused, adnate, membranaceous. Hymenial surface smooth, pale yellow to greyish yellow, unchanged in KOH. Hyphal system monomitic; generative hyphae clamped. Subiculum thin; hyphae slightly thick-walled, colorless, smooth. Subhymenium indistinct. Hyphidia rare. Cystidia or gloeocystidia absent. Basidia clavate to subcylindrical, thin-walled, with four sterigmata and a basal clamp connection. Basidiospores ellipsoid, thin-walled, colorless, smooth, IKI, CB–. Associated with a white rot of dead hardwood branches and bamboo.

Index Fungorum Number: IF844194

Type species: Effusomyces thailandicus Yue Li, Nakasone & S.H. He 2022, in Li, et al., Journal of Fungi, 8, 1229 (2022)

Notes: Effusomyces are characterized by thin, membranous basidiomes, a smooth hymenophore, a monomitic hyphal system with clamped generative hyphae, and a lack of cystidia or gloeocystidia. Although lacking distinctive morphological features, Effusomyces are nested within the Cystostereaceae and are sister to Crustomyces. Crustomyces (Rigidotubus) tephroleucus also is monomitic and lacks cystidia and gloeocystidia but has a tough, thick (up to 0.5 mm) basidiome and poroid hymenophore. Within the family, monomitic hyphal systems with clamped generative hyphae are also reported in Parvobasidium, Parvodontia, and some species of Crustomyes and Cystostereum. Still, these taxa also have cystidia, gloeocystidia, or thick-walled basidiospores.


Effusomyces thailandicus Yue Li, Nakasone & S.H. He 2022


Li, Y., Nakasone, K. K., Chen, C. C., Zhao, C. L., Cao, T., Yuan, H. S., & He, S. H. (2022). Taxonomy and Phylogeny of Cystostereaceae (Agaricales, Basidiomycota): A New Genus, Five New Species, and Three New Combinations. Journal of Fungi, 8, 1229.


About Basidiomycota

The webpage Basidiomycota provides an up-to-date classification and account of all genera of the phylum Basidiomycota.


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Thailand Science Research and Innovation (TSRI)

project entitled:

"Macrofungi diversity research from the Lancang-Mekong Watershed and surrounding areas"

(Grant No. DBG6280009)


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