Tyromyces chioneus

Tyromyces chioneus

''Tyromyces chioneus'', commonly known as the white cheese polypore, is a species of polypore fungus. A widely distributed fungus, it has a circumpolar distribution, in temperate boreal pine forests, of Asia, Europe, and North America, causes white rot in dead hardwood trees, especially birch
White cheese polypore These really do feel like soft cheese.  Geotagged,Summer,Tyromyces chioneus,United States

Appearance

The fruit bodies are semicircular to fan-shaped brackets that measure up to 8 cm broad by 10 cm wide, with a thickness of 0.5–2 cm . The upper surface is initially white before aging to yellowish or grayish, and has a texture ranging from smooth to tomentose. The undersurface features white to cream-colored, round to angular pores measuring 3–4 per millimeter. The flesh is soft and fleshy when young, but becomes hard and brittle in age or when dry. It has a mild or indistinct taste, and a pleasant odor.

It has a white spore print, and the spores are smooth, cylindrical, hyaline , with dimensions of 4–5 by 1.5–2 µm. The basidia are club-shaped, four-spored, and measure 10–15 by 4–5 µm; they have a clamp at their base. The hyphal system is dimitic, consisting of generative and skeletal hyphae. The generative hyphae have clamps and are intricately branched. The skeletal hyphae, in contrast, are thick-walled, rarely branched, and measure 2–4.5 µm in diameter. Although cystidia are absent from the hymenium, there are fused cystidioles measuring 15–20 by 4–5 µm.
Tyromyces chioneus The fruiting bodies were soft and smooth, fan-shaped, and whitish.  The undersurface had white pores.  

Habitat: Growing on fallen, yellow birch
https://www.jungledragon.com/image/76193/polyporales.html Fall,Geotagged,Tyromyces chioneus,United States,White cheese polypore,polyporales,polypore

Distribution

''Tyromyces chioneus'' causes white rot in dead hardwood trees. Its most common host is birch. The species has a circumpolar distribution, in temperate boreal pine forests, including Asia, Europe, and North America. In Greenland, it is common on ''Betula pubescens''.
Tyromyces chioneus The fruiting bodies were soft and smooth, fan-shaped, and whitish. The undersurface had white pores. 

Habitat: Growing on fallen, yellow birch
https://www.jungledragon.com/image/76191/polyporales.html Fall,Geotagged,Tyromyces chioneus,United States,White cheese polypore

Habitat

''Tyromyces chioneus'' causes white rot in dead hardwood trees. Its most common host is birch. The species has a circumpolar distribution, in temperate boreal pine forests, including Asia, Europe, and North America. In Greenland, it is common on ''Betula pubescens''.

References:

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Taxonomy
KingdomFungi
DivisionBasidiomycota
ClassAgaricomycetes
OrderPolyporales
FamilyPolyporaceae
GenusTyromyces
SpeciesT. chioneus