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Species Information
Summary: Features include a tiny dark brown fruitbody on cork ridges of Subalpine Fir trees with cork bark disease, a brownish color change in the liquid when mounted in dilute KOH, and microscopic characters. Dermea rhytidiformans causes cork-bark disease of Subalpine Fir.
It was described from BC.
Upper surface: apothecia [sexual fruitbodies] 0.08-0.1cm across, up to 0.1cm high, "round or slightly undulate", dark brown; spore-bearing surface flat, marginate, dark brown; conidial fruitbodies 0.02-0.06cm across, 0.05-0.07cm high, "columnar to conicotruncate" to nearly spherical, "involuted on the top", dark brown, furfuraceous
Underside: dark brown; furfuraceous
Stem: present
Chemical Reactions: apothecia "mounted in dilute KOH produce a brownish discoloration in the liquid"
Microscopic: spores 18-28 x 8-11 microns, elliptic to oval or irregular, light brown, aseptate; asci 8-spored, 130-155 x 14-17 microns, cylindric-clavate, short-stemmed, pore not staining blue in iodine; paraphyses "slightly longer than asci, forming an epithecium strongly encrusted with brown granules", filiform [thread-like], branching; macroconidia 25-65 x 3.5-5.5 microns, "sickle-shaped to almost fusoid", colorless to light brown, 0-3-septate, "frequently with one or two swollen cells"; microconidia 10-22 x 1.5 microns, "filiform, strongly curved at one end", colorless, 1-celled
Habitat / Range
superficial on the cork ridges of cork bark of Abies lasiocarpa (Subalpine Fir), fruiting perennially from the sides of the ridges: the fruitbodies are "at first slightly erumpent through the outer cork cells, but then appearing superficial, though sometimes slightly hidden in small cracks"; apothecia aggregated or single, superficial, "appear to be prime in late summer and autumn and occur intermixed with the conidial state"; conidial fruitbodies "single or aggregated, superficial on cork ridges or erumpent through smooth bark in early infections", "usually very abundant and present throughout the year"
