Summary:
Features include 1) resupinate growth on wood, 2) a fruitbody that is thin, flat, cottony, and whitish, 3) spores that are elliptic to slightly navicular, 4) 6-spored basidia, and 5) a monomitic hyphal system, all septa with clamp connections, the basal hyphae wide and thick-walled.
Botryobasidium subcoronatum has been found in BC, WA, OR, ID, MB, NS, NT, ON, PQ, AZ, CA, CO, CT, LA, MA, MD, MI, MN, MO, MT, NC, NH, NJ, NM, NY, PA, RI, TN, VT, and WI, (Ginns), Europe including Switzerland, Asia, (Breitenbach), and Denmark, Norway, Sweden, and Finland, (Eriksson).
Fruiting body:
resupinate, appressed tightly, cottony and soft in consistency, "open-tomentose when young, later almost membranous patches several centimeters in extent"; "whitish when young, cream-colored to yellow-ocherish when older"; smooth, dull, tomentose; margin thin, (Breitenbach), thin, at first reticulate [netted] to hypochnoid [with dry rather loosely intertwined hyphae arranged flat on substrate], when old a more or less continuous subpellicular layer; at first whitish, then yellowish or ochraceous, (Eriksson), spore deposit white (Buczacki)
Microscopic:
SPORES 6-9 x 3-3.5 microns, elliptic to slightly navicular [boat-shaped], smooth, inamyloid, colorless, cyanophilic; BASIDIA 6-spored, 15-25 x 6-10 microns, cylindric, with basal clamp connection; CYSTIDIA not seen; HYPHAE monomitic 5-10(12) microns wide, thin-walled to thick-walled, all septa with clamp connections, (Breitenbach), SPORES 6-7.5 x 2.5-3 microns, navicular with distinct apiculus, smooth; BASIDIA mostly 6-spored, 20-25(30) x 7-9 microns, "at first rounded or ellipsoid, then longer and more subcylindrical, more or less constricted"; HYPHAE monomitic: hyphae loosely interwoven, clamped, BASAL HYPHAE 7-10 microns wide, thick-walled, colorless, richly branched, (Eriksson)
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