Summary:
Features include flat growth on wood with the white pore surface exposed, soft cottony white flesh, small pores, and microscopic characters including lunate to allantoid spores. The description is derived from Gilbertson(1).
Sidera lenis has been found in BC, WA, OR, ID, AB, NF, AK, AZ, CA, CO, FL, GA, MA, MT, NC, NM, NY, PA, TN, TX, UT, WY, and circumglobally in the conifer zone [so presumably in Europe and Asia], (Gilbertson).
Cap:
growing flat on wood with pore surface exposed, up to 0.4cm thick, soft, separable, light in consistency, margin narrow and white
Flesh:
0.1-0.3cm thick, soft, cottony to fibrous; white
Pores:
5-7 per mm, somewhat sinuous when old; white, cream to pale buff; tube layer up to 0.3cm thick, white
Microscopic:
spores 3.5-4.5 x 1-1.5 microns, lunate [crescent-shaped] to allantoid [curved sausage-shaped], smooth, inamyloid, colorless; basidia 8-12 x 3-5 microns, clavate, with basal clamp; cystidia none, but "scattered, non-projecting fusoid cystidioles variably present in the hymenium, 15-20 x 3-4 microns"; hyphal system dimitic: generative hyphae 2-4 microns wide, thin-walled, with clamp connections, skeletal hyphae 2-5 microns wide, thick-walled, unbranched and straight to sinuous, "in old specimens often with a light incrustation and resembling small cystidia, in some specimens all skeletal hyphae smooth"
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