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Species Information
Summary: Features include 1) resupinate growth on conifer wood, 2) membranaceous to waxy fruitbodies that are cream-colored and smooth, the margin narrow and indistinct, 3) spores that are small, amyloid, broadly elliptic to nearly round, and verrucous to warted, 4) numerous gloeocystidia that are cylindric to sinuous, with granular, sulfo-positive contents, not noticeably projecting, and 5) a monomitic hyphal system, the hyphae without clamp connections.
Boidinia propinqua was originally described from BC, and it is known from 3 collections there and one in TN.
Fruiting body: 2-3cm across and 0.015-0.03cm thick, effused [spread out], fragile, membranaceous to ceraceous [waxy], "often erupting as small discontinuous patches"; whitish cream "light buff" to cream color "light ochraceous-buff" when dry; "smooth, not cracking to cracking sparingly"; "margin narrow, indistinct, pruinose to weakly fibrillose", colored as the rest of the spore-bearing surface, (Ginns(24)), "broadly effused, or in small irregular areas", 0.0125-0.02cm thick, adnate; creamy white; surface soft-membranous, becoming rimose [cracked], exposing substrate; margin abrupt, (Jackson)
Microscopic: SPORES 3.8-4.0(4.4) x 3.0-3.6 microns, broadly elliptic to nearly round, verrucose to warted, amyloid, thin-walled, with a large apiculus; BASIDIA 4-spored, 20-38 x 3.4-4.4 microns, cylindric to narrowly clavate, "sometimes with a median constriction and a ventricose base", sterigmata up to 4 microns long; GLOEOCYSTIDIA numerous, 40-200 x 5-11 microns, "cylindric to sinuous, often with a ventricose base and acuminate tip, thin-walled, adventitious septa common and sometimes numerous", the contents colorless to yellowish green in KOH under bright field, "granular, sulfo-positive"; HYPHAE monomitic, 2.0-3.6(4.8) microns wide, distinct, colorless, thin-walled, smooth, without clamp connections, "the hyphae forming a loosely arranged, distinct layer" about 50 microns thick next to and parallel with the substrate, "hyphae between the basal layer and the subhymenium compact but distinct", (Ginns(24)), SPORES 3.5-4 x 3-3.5 microns, nearly round, verrucose, strongly amyloid, thin-walled, with prominent peg-like apiculus; BASIDIA 4-spored, 20-25 x 4.5-5.5 microns, cylindric, ventricose or subventricose in lower part, sterigmata 4 microns long, nearly straight or slightly arcuate; GLOEOCYSTIDIA numerous, 50-90 x 6-8.5 microns, cylindric or subclavate, flexuous [wavy], often ventricose in lower part, "arising from the base of the subiculum or at various levels and extending to the surface of the hymenium, not noticeably projecting"; subiculum "with a few horizontal hyphae but for the most part with upright, thin-walled, mostly collapsed hyphae without clamps", (Jackson), GLOEOCYSTIDIA sulfo-positive, (Ginns(23))
Habitat / Range
on barkless, well rotted or rather firm wood of Pseudotsuga menziesii (Douglas-fir) and Thuja plicata (Western Red-cedar), (Ginns(24))
Similar Species
Boidinia furfuracea has spores 4.5-6 microns in diameter, sulfo-negative gloeocystidia, and clamp connections, (Ginns(23), but note that Eriksson(3) and Breitenbach(2) give gloeocystidia as sulfo-positive); Gloeocystidiellum porosum has clamp connections, (Jackson); Conferticium ravum has different gross characters of the fruitbody, different substrate, and larger, almost smooth spores, (Jackson)
Ginns(24) (colors in quotation marks from Ridgway), Jackson(1) (as Corticium propinquum), Ginns(5), Ginns(23), Breitenbach(2) (discussing Boidinia furfuracea), Eriksson(3) (discussing Gloeocystidiellum furfuraceum) References for the fungi
