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Species Information
Summary: Features include 1) growth on wood, 2) fruitbodies that are pellicular, cream color at first, developing interrupted randomly arranged folds and wrinkles, the surface somewhat waxy when old, the margin mycelioid to membranous, the subiculum soft, loose, and white, and rhizomorphs often present, 3) spores that are cylindric, smooth, inamyloid, and colorless, with a prominent apiculus, and 4) a monomitic hyphal system, the hyphae with clamp connections.
Ceraceomyces borealis has been reported from BC, WA, ID, AB, ON, PQ, AL, CO, ME, MI, MN, NC, NY, and TN, (Ginns(5)), and Czechoslovakia, Finland, Sweden, USSR (European part), Russia (Siberia), and Morocco, (Ginns(12)).
Fruiting body: resupinate, up to 13cm x 6cm, and averaging 0.08cm thick; separable; cream when fresh, "drying ochraceous to brownish or rarely darker"; "frequently mottled, shiny or somewhat pruinose, translucent near the margin, often fissured, crust-like, rugose to gyrose-plicate", the folds when present about 0.05cm wide and 0.07cm deep, "interrupted, randomly arranged, not forming pits"; margin 0.2(0.4)cm wide, "mycelioid to membranous, thin, loosely attached", white when fresh, white or pallid when dry; hyphal strands present in some specimens up to 0.05cm wide; flesh about 0.07cm thick, homogeneous, white to pallid, (Ginns), large, often several decimeters in extent, loosely attached to wood, pellicular, at first thin and soft, when old developing a thickened somewhat ceraceous [waxy] spore-bearing surface; white becoming yellowish or even pale ochraceous; "at first smooth but soon much folded and wrinkled"; subiculum soft, loose, and white, rhizomorphs often present, (Eriksson), spore deposit white (Buczacki)
Microscopic: SPORES 4.5-7(8.5) x 1.5-2(2.5) microns, subfusiform to cylindric, in side view "adaxially concave or basally bent", "with prominent, broad, blunt apiculus", spore iodine negative, colorless in KOH, often adhering in groups of 2-4; BASIDIA 20-33 x 4-5.5 microns, narrowly clavate; CYSTIDIA absent; HYPHAE monomitic: context hyphae 2-7.5(9) microns wide, loosely woven, colorless, "exterior sparsely crystalline-incrusted, with prominent clamps", thin-walled or occasionally rather thick-walled, often collapsed when dried; "subhymenial detail often obscure because of dense, granular deposits, generally showing thickening, hyphae closely packed", (Ginns(12)), SPORES 6-8 x 1.8-2 microns, cylindric, with oblique apiculus, smooth, thin-walled; BASIDIA 4-spored, 16-22 x 4-5 microns, clavate, with basal clamp connection; CYSTIDIA none; HYPHAE monomitic: SUBICULAR HYPHAE 4-7 microns wide, thin-walled, or somewhat thick-walled, loosely interwoven, SUBHYMENIAL HYPHAE 2-3 microns wide, richly branched and densely interwoven, clamp connections on all septa, hyphal branches originating at clamp cells or between septa, (Eriksson)
Habitat / Range
saprophytic on hardwoods and conifers, especially Betula [birch], Populus, Quercus [oak], Abies [fir], Picea [spruce], and Pinus [pine]; associated with a brown rot, mainly in August and September, but recorded as early as July and as late as December, (Ginns(12)), associated with a brown rot or a white rot, (Ginns(5)), summer, fall, (Buczacki)
