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Species Information
Summary: Features include 1) resupinate growth on foliage and branches near the ground at high elevations, especially near snowbanks, 2) a skin-like spore-bearing surface that is pale tan to darker brown, and wrinkled to smooth, with a narrow, white to pallid margin, 3) a thin, soft, white, floccose to arachnoid, underlying subiculum from which the spore bearing surface is easily separated, 4) spores measuring (8.5)9.9-12.0(13) x (5.0)6.3-7.7(8.8) microns, broadly elliptic, smooth, inamyloid, weakly cyanophilic, and colorless or slightly yellowish in KOH when mature, 5) cystidia that are broadly clavate, projecting slightly or embedded, and 6) a monomitic hyphal system, the hyphae with clamp connections. It is a common snowbank fungus at high elevations in western North America (Gilbertson).
Cylindrobasidium corrugum has been found in BC, WA, OR, ID, AB, AK, AZ, CA, CO, NM, UT, and WY, (Ginns(5)).
Fruiting body: resupinate, small, 3cm x 1cm, to medium, 10cm x 3cm, up to 0.05cm thick, fragile, spore-bearing surface readily separating from subiculum even in dried specimens; when dry pale yellow, pale brown, yellow brown, brown, to chestnut; even to wrinkled, "typically smooth in herbarium specimens", "granulose to somewhat waxy"; margin "white to pallid, cottony or cobwebby, sometimes extensively developed", usually 0.1-0.3cm wide; context thin, cottony, homogeneous, white to pallid, (Ginns(21)), resupinate, widely effused [spread out], easily separated; pale tan to darker brown; merulioid to smooth; spore-bearing area compact and pelliculose [skin-like] on "a thin, soft, white, floccose to arachnoid subiculum which extends beyond the hymenial layer at the margin", (Gilbertson)
Microscopic: SPORES (8.5)9.9-12(13) x (5)6.3-7.7(8.8) microns, "mostly broadly ellipsoid or broadly obovoid, somewhat flattened on the adaxial surface, with a broad (1.1 micron wide), truncated apiculus", smooth, inamyloid, colorless, weakly cyanophilous, thin-walled, most collections lack spores and mature basidia; BASIDIA 4-spored, (32)40-55(68) x (7)9-11(13) microns, clavate, when mature the basidia projecting up to 16 microns (including sterigmata up to 8 microns) above general level of hymenium; scattered CYSTIDIA present in some specimens, arising in the subhymenium and not projecting, 55 x 14-19 microns, broadly clavate, the walls thin, colorless but sometimes 0.5 microns thick and pale yellow; HYPHAE monomitic: context hyphae 3.2-7(9) microns wide, loosely woven, "branched, sometimes with some segments crystalline encrusted, with single clamp connections and a few simple septa", the walls colorless, smooth, thin to 0.8 microns thick, (Ginns(21)), SPORES 7-10 x 5-7 microns, broadly elliptic, inamyloid, colorless or slightly yellowish in KOH when mature; BASIDIA 4-spored, up to 60 microns long and 8-12 microns wide, clavate, with basal clamp connection; CYSTIDIA projecting slightly or embedded, 40-45 microns long and up to 18 microns wide at apex, "broadly clavate with a greatly expanded apex with distinctly thickened wall", colorless; HYPHAE monomitic, SUBICULAR HYPHAE 4-6 microns wide, thin-walled, some encrusted with crystalline material, "with occasional branching, with abundant clamp connections and also simple septa", (Gilbertson), SPORES (8.5)9.9-12.0(13) x (5.0)6.3-7.7(8.8) microns, (Ginns(23))
Habitat / Range
"on living foliage and branches near the ground and on fallen stems and branches of a variety of conifers and occasionally on other hosts", at altitudes between 1700 and 4000 meters, usually June to August but occasionally at late as November, (Ginns(21)), perhaps psychrophilic [growing at cold temperatures], on live foliage, branches near ground, logs, stones and litter after melting of snowpack, (Ginns(5)), "commonly develops profusely in snow over the surfaces of living plants and foliage of fallen conifers as well as on dead branches and other dead wood on the ground", (Gilbertson)
Similar Species
Cylindrobasidium laeve has spores 7-12 x 4.5-6.0 microns, (Ginns(23)). Cylindrobasidium torrendii has spores 4-6 x 2.5-3 microns, (Ginns(23)).
