Summary:
Features include 1) resupinate growth on wood, 2) a fruitbody that is whitish, somewhat waxy, and firmly attached, with spines about 0.15cm long, the margin finely fibrillose to fringed, sometimes forming runners or rhizomorphs, 3) spores that are elliptic to short-cylindric, smooth, and colorless, 4) cystidia arising from the trama, projecting, evenly distributed over the spine, encrusted, cylindric to somewhat fusiform in distal part, 5) a dimitic hyphal system, the hyphae with clamp connections.
Steccherinum ciliolatum has been found in BC, AB, NB, ON, PE, PQ, AZ, CO, IA, MA, MD, MI, MN, MT, NC, NM, NY, and SC, (Ginns), as well as Europe (Maas Geesteranus).
Fruiting body:
effused [spread out], eventually covering an area of several square centimeters, inseparable from substrate without damage, spore-bearing surface at first minutely porous, becoming subceraceous [somewhat waxy] to ceraceous; milk-white to pale cream; finally areolately cracked; spines up to about 0.15cm long, 0.01-0.02cm wide, moderately crowded to subdistant, subulate [awl-shaped], terete [round in cross-section] to more or less flattened, straight, simple or connate, rarely furcate [forked], pulverulent [powdery] or pubescent [downy] to almost hispid [bristly], cream in younger parts of fruitbody, pale ochraceous in center, tip fimbriate [fringed] to lacerate, white; flesh "very thin, soft, whitish"; margin finely fibrillose to fimbriate, sometimes forming runners or rhizomorphs, whitish, (Maas Geesteranus), annual, less than 0.1cm thick, toothed surface "light buff" to "ochraceous-buff", the teeth appearing somewhat farinaceous [mealy], cylindric, tapering to the tip, 0.02-0.05cm long, the apices finely fimbriate; "margin finely fimbriate, fertile to the edge"; "subiculum pale buff, very thin", (Gilbertson)
Microscopic:
SPORES 4.5-5.4 x 1.8-2.7 microns, elliptic to somewhat elongate, adaxially flattened, smooth, colorless, with small oblique apiculus; BASIDIA 4-spored, 18-22 x 4.5-6 microns, clavate, with basal clamp connection, sterigmata 2.7-3.6 microns long; CYSTIDIA 3.5-8 microns wide, "of tramal origin, evenly distributed over length of spine, numerous to abundant", more or less projecting, encrusted, cylindric to somewhat fusiform in distal part, with obtuse or more acute tip; HYPHAE dimitic, CONTEXT consisting of generative and skeletal hyphae, generative hyphae up to 5.4 microns wide, not inflating, branched, thin-walled to moderately thick-walled, septate with clamp connections, skeletal hyphae 2.7-5.4 microns wide, thick-walled to solid, context of spines similar, skeletal hyphae usually somewhat narrower, (Maas Geesteranus), SPORES 4-4.5 x 2-2.5 microns, short-cylindric, smooth, colorless; BASIDIA 4-spored, 4-5 microns wide, clavate; CYSTIDIA 6-8 microns wide, completely imbedded or projecting up to 30 microns, "abundant, sometimes projecting in clusters, scattered along sides of teeth and at apices", thick-walled, heavily encrusted; SUBICULAR HYPHAE closely interwoven, of 2 types: 1) 3-3.5 microns wide, "thin-walled, often branched, with frequent clamp connections", 2) 3-4 microns wide, thick-walled, aseptate, often encrusted, rarely branched, apparently ending in encrusted cystidia, (Gilbertson), SPORES 3.5-5 x 2-2.5 microns, (Martin)
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