Summary:
Features include 1) resupinate growth on wood, 2) a cobwebby to hypochnoid fruitbody with whitish to buff color, 3) great variation in spore size and shape in single specimens, the spores smooth, inamyloid, and colorless, 4) spherical young basidia, 5) wide subicular hyphae that branch at wide angles, and 6) the absence of clamp connections. The description is derived from Lentz(1).
Botryobasidium croceum has been found in SK and MS, (Ginns(5)). J. Ginns (pers. comm.) collected this species from Vancouver Island in BC.
Fruiting body:
thin, spread out on wood, loosely and delicately arachnoid [cobwebby], ranging to moderately thin and densely hypochnoid [with dry rather loosely intertwined hyphae arranged flat on substrate]; thinner areas sordid whitish, thicker areas intermediate between "light buff" and "pinkish buff"
Microscopic:
SPORES (6)7.5-12.5(15) x 3.5-4.5(6) microns, "showing extreme variability of shape, from naviculate or subfusiform to obliquely and narrowly ovoid or oblong-ellipsoid, apically rounded or tapered, broadly rounded basally or tapering obliquely, smooth, thin walled, colorless, nonamyloid"; BASIDIA 2-6-spored, 12.5-17.5 x 8.5-12.5 microns, initially more or less spherical, but flattened at base, becoming ovoid or obpyriform, thin-walled; hyphae bearing the basidia up to 12.5 microns wide, "forming numerous short branches, more or less closely septate, with some sub-basidial cells appearing inflated between the septa, lacking clamp-connections, thin walled, colorless"; SUBICULAR HYPHAE about 7.5-11 microns wide, "branching at wide angles, with numerous H-branches, septate, not constricted at the septa, lacking clamp-connections, moderately thin walled, colorless or yellowish, or more deeply colored near the substratum"
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