Summary:
Features include flat growth on conifer wood with the pore surface exposed, a soft light consistency, yellow-brown pores and margin, easy separability from wood, and microscopic characters including the absence of setae. The description is derived from Gilbertson(1).
Inonotopsis subiculosa has been found in BC, AB, NB, NS, ON, CO, MI, MT, NY, and WI, (Gilbertson). It is known from 2 collections on Douglas-fir at Prince George (Ginns(28)).
Cap:
growing flat on wood with pore surface exposed, spread out up to 10cm, "soft and cottony or felty, easily separable", margin yellowish-brown, soft, loosely matted, fimbriate (fringed), and up to 0.2cm wide
Flesh:
up to 0.2cm thick, very soft, cottony, not zoned; yellowish brown
Pores:
1-3 per mm, angular to sinuous, with thick walls that are tomentose at first, soon becoming torn and splitting so that the pores coalesce; yellowish brown; rough; tube layer up to 0.2cm thick, soft, paler yellowish brown than the flesh
Microscopic:
spores 6-8.5 x 4.5-5.5 microns, broadly elliptic to oval, smooth, inamyloid, colorless; basidia 4-spored, 14-20 x 6-8 microns, clavate, simple-septate at base; setae and other sterile hymenial elements absent; context hyphae "reddish brown to pale yellowish-brown in KOH, thin-walled, rarely to frequently branched, simple-septate, 4-9 microns in diam, also some thick-walled hyphae, often with light, scattered incrustation, tramal hyphae similar"
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