Cudonia circinans

Cudonia circinans

Cudonia is one of several remote ascomycete genera with needly spores, and my find fit the description of Cudonia circinans, which grows under conifers and has a pale yellow to brownish cap, with a somewhat darker brown stem. Cudonia lutea, by contrast, is brighter yellow, grows under hardwoods, and has a stem colored like the cap. The definitive feature separating the two species, however, is spore size (over 50 µm long for Cudonia lutea and under 40 µm long for Cudonia circinans).
Cudonia circinans  Cudonia circinans,Fall,Geotagged,United States

Appearance

Cap: 10–20 mm across; cushion-shaped to irregularly convex, with the margin curled under; upper surface bald, sometimes a little wrinkled; dry; creamy to pale pinkish tan; undersurface similar to upper surface.

Stem: 15–30 mm long; 2–5 mm thick; dry; bald or very finely fuzzy near the base; often with longitudinal grooves or ridges which may extend onto the undersurface of the cap; brown to purplish tan; attached to copious underground, sulphur yellow mycelium.

Flesh: Thin; insubstantial; not gelatinous.

Odor: Not distinctive.

Chemical Reactions: KOH negative on cap surface.

Microscopic Features: Spores 35–40 x 1.5–2.5 µm; cylindric with one aciculate end and one end merely rounded; often a little curved; smooth; hyaline and multiguttulate in KOH. Asci 75–125 x 8–11 µm; fusiform, with subacute apices; hyaline in KOH. Paraphyses 75–150 x 2–3 µm; filiform; often exceeding the asci and curving or looping; apices varying from subacute to subclavate or merely rounded; smooth; hyaline in KOH.
Cudonia circinans  Cudonia circinans,Geotagged,United States,Winter

Distribution

widely distributed in northern and montane North America

Habitat

Presumably saprobic; growing scattered to gregariously or in clusters on the duff of spruces and other conifers, and occasionally on well-rotted wood; late summer and fall

References:

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http://www.mushroomexpert.com/cudonia_circinans.html
Taxonomy
KingdomFungi
DivisionAscomycota
ClassLeotiomycetes
OrderHelotiales
FamilyCudoniaceae
GenusCudonia
SpeciesCudonia circinans