Summary: Features include 1) resupinate growth on wood, 2) fruitbodies that are waxy becoming hard, creamish pale to honey-colored becoming ochraceous, and smooth becoming tuberculate and cracked, the margin abrupt to slightly pruinose, and the fruitbodies typically layered, 3) spores that are elliptic, smooth, and amyloid, 4) gloeocystidia that are numerous to rare, cylindric to clavate, colorless to yellowish, and sulfo-negative, and 5) a monomitic hyphal system, the hyphae densely arranged, and lacking clamp connections. Ginns(23) and Ginns(24) accept this species in Conferticium as Conferticium ochraceum (Fr.) Hallenb., but Stalpers(3) uses the name Gloeocystidiellum ochraceum.
Microscopic: SPORES 3.5-5.5 x 2.0-3.0 microns, elliptic, adaxially slightly concave, smooth, amyloid, acyanophilic, thin-walled, "with a small, rounded, indistinct apiculus", (the two Washington collections with larger and somewhat differently shaped spores, compared with the others); BASIDIA 4-spored, 17.5-28.0 x 4.0-5.0 microns, clavate to cylindric, sterigmata 4-5 microns long; GLOEOCYSTIDIA numerous to rare, 35-120 x 4-8 microns, cylindric to clavate, contents colorless to yellowish in KOH, granular, sulfo-negative; HYPHAE monomitic; subiculum weakly amyloid in some collections; hyphae 2.0-4.0 microns wide, "compact, indistinct, pseudoparenchymatous", lacking clamp connections, typically stratose, encrusted with scattered crystals near the substrate, the walls thin to 1.2 microns thick, acyanophilic; hymenium and subhymenium weakly dextrinoid in some collections, (Ginns(24)), SPORES 4.5-6 x 3-3.5 microns, elliptic to somewhat oval, smooth, amyloid, thin-walled; BASIDIA 4-spored, 20-30 x 4-5 microns, subclavate, without clamp connections; GLOEOCYSTIDIA (= pseudocystidia) 40-60 x 4-5 microns, thin-walled, "filled with oily, granular, yellowish contents (in KOH)", best seen in young fruitbodies, in which they may be numerous; HYPHAE monomitic: hyphae 2-3.5 microns wide, thin-walled to somewhat thick-walled, cyanophilic, without clamp connections, "in a very dense parenchymatous context", with a thin layer of horizontal hyphae next to substrate, otherwise "of vertical, parallel, densely united hyphae", in perennial strata, (Eriksson)
Notes: Collections were examined from BC, WA, OR, ID, NS, PQ, CA, 14 collections found from North America, reported also from NT, AK, MA, NC, PA, (Ginns(24)). It also occurs in Europe including Finland, Norway, and Sweden, (Eriksson).
Habitat and Range
SIMILAR SPECIES
Corticium ravum (Gloeocystidiellum karstenii) has ornamented spores but the ornamentation is hard to see (best seen in empty spore coats stained with Melzer''s), and generally grows on hardwoods (Eriksson), but is recorded on Pseudotsuga menziesii [Douglas-fir], (Ginns(5)). Gloeocystidiellum luridum, G. leucoxanthum, G. porosum, and G. clavuligerum have clamp connections, (Eriksson). Gloiothele lactescens has longer gloeocystidia (Eriksson).
Habitat
fruiting on the bark of dead saplings, and the underside of fallen, rotted limbs of conifers and hardwoods in a variety of genera, Abies balsamea (Balsam Fir), Alnus sp. (alder), Betula alleghaniensis (Yellow Birch), Picea engelmannii (Engelmann Spruce), P. glauca (White Spruce), P. sitchensis (Sitka Spruce), Pinus resinosa (Red Pine), Pseudotsuga menziesii (Douglas-fir), Quercus chrysolepis (Canyon Live Oak), Quercus garryana (Oregon White Oak), Tsuga heterophylla (Western Hemlock), (Ginns(24)), on barkless wood, moss-covered cut wood; butt, (Ginns(5)), on conifer wood, producing an intense fibrous and lamellate decay, (Eriksson)