Cotylidia diaphana

Cotylidia diaphana

small to moderately sized, white, stalked, fan-shaped to funnel-shaped fruit bodies with a smooth to wrinkled hymenium, tissues composed of monomitic hyphae, basidia producing smooth, nonamyloid spores, the absence of clamp connections, and bearing projecting cylindrical, thin-walled, hymenial cystidia.
Cotylidia diaphana  Cotylidia diaphana,Geotagged,Summer,United States

Appearance

small to moderately sized, white, stalked, fan-shaped to funnel-shaped fruit bodies with a smooth to wrinkled hymenium, tissues composed of monomitic hyphae, basidia producing smooth, nonamyloid spores, the absence of clamp connections, and bearing projecting cylindrical, thin-walled, hymenial cystidia.

References:

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https://en.wikipedia.org/wiki/Cotylidia
Taxonomy
KingdomFungi
DivisionBasidiomycota
ClassAgaricomycetes
OrderHymenochaetales
FamilyRepetobasidiaceae
GenusCotylidia
SpeciesCotylidia diaphana