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Species Information
Summary: Features include tiny, circular, dark reddish brown to black, slightly furfuraceous fruitbodies with the spore-bearing surface black and flat to convex, the margin at first raised; consistency leathery to horny (fleshy-leathery when moist); erumpent growth on spruce; and microscopic characters.
Dermea grovesii was described from ON. There are 2 collections from BC at the Pacific Forestry Centre determined by A. Funk.
Upper surface: apothecia [sexual fruitbodies] 0.03-0.1cm across, 0.04-0.12cm high, "circular to slightly undulate"; spore-bearing upper surface black, flat to becoming convex; "at first with a thick, raised margin which later disappears"; conidial fruitbodies 0.02-0.045cm in diameter at their base, 0.1-0.2cm high, "cylindric to cylindric-conic or subulate to frequently slightly swollen at their tips", brown to black, bald, consistency "hard, horny, brittle, becoming more fleshy-leathery when moist"
Flesh: consistency hard, leathery to horny, becoming more fleshy-leathery when moist
Underside: dark reddish brown to black; slightly furfuraceous
Microscopic: spores 16.5-21.5 x 6-8 microns, elliptic, straight to somewhat curved, colorless, but containing a yellowish-brown pigment in the droplets, 0-2-septate but mainly with one median septum, not constricted; asci 8-spored, 65-120 x 13-15 microns, cylindric-clavate, tapering in lower part into a short stem; paraphyses filiform, colorless, "septate, simple or branched, slightly swollen and glued together at their tips through gelatinization"; conidia 60-95 x 6.5-8 microns, "straight to usually curved, falcate", at first colorless and continuous [aseptate], becoming yellowish brown and 6-septate to 10-septate; phialides 33-55 x 2.5-4 microns, "with a minute collar, simple, cylindric, with 1 or 2 septa", colorless to nearly colorless at their base; microconidia not seen
Habitat / Range
"erumpent, scattered to gregarious, separate or sometimes two to four in a cluster" on Picea glauca (White Spruce); conidial fruitbodies "erumpent, scattered, single, or clustered in groups of two to five and then united at their base", arising from a spherical to irregularly shaped basal stroma, (Reid, J.), BC specimens were also on Picea glauca
Similar Species
Dermea piceina Groves, described from Ontario on spruce, has slightly longer asci and slightly shorter spores, but the most significant difference is that the conidial fruitbodies of D. piceina are almost spherical and 0.01-0.03cm in diameter and the conidiophores lining the cavity are simple to branched and produce 1-celled to 4-spored conidia only 22-40 x 3-5 microns, (Reid, J.). See also SIMILAR section of Dermea balsamea and Dermea pseudotsugae.
