E-Flora BC: Electronic Atlas of the Flora of British Columbia

Dermea tetrasperma A. Funk
no common name
Dermateaceae

Species account author: Ian Gibson.
Extracted from Matchmaker: Mushrooms of the Pacific Northwest.

Introduction to the Macrofungi
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Distribution of Dermea tetrasperma
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Species Information

Summary:
Features include tiny, elliptic or circular, black fruitbodies with the spore-bearing surface flat, leathery consistency, absent stem, erumpent growth on Douglas-fir stem, and microscopic characters including 4-spored asci.

It is found in BC (Funk).
Upper surface:
apothecia [sexual fruitbodies] 0.05-0.15cm in diameter, ellipsoid to suborbicular [nearly circular], black, spore-bearing surface flat, without margin, black; conidial fruitbody erumpent, black, 0.03-0.1cm in diameter, irregular, becoming shallow cup-shaped or disc-shaped
Flesh:
consistency coriaceous [leathery]
Underside:
black
Stem:
sessile [without a stem]
Microscopic:
spores 14-17 x 4-6 microns, elliptic, colorless, continuous [aseptate], with 2 droplets; asci 4-spored, 78-95 x 8-10 microns, clavate; paraphyses "longer than the asci and agglutinated at the tips to form an epithecium", filiform [thread-like], colorless, septate, branched; conidia 15-22 x 5-6 microns, falcate [sickle-shaped], continuous, colorless; conidiophores 10-30 x 2-3 microns, "simple, cylindric, phialidic"

Habitat / Range

erumpent, single, gregarious, on stem of Pseudotsuga menziesii (Douglas-fir), the conidial state first described from a blister rust canker of Pinus monticola (Western White Pine); "associated with die-back in semimature trees and also with small cankers in young trees", one collection "found on callus growth around a graft"

Synonyms and Alternate Names

Daedalea confragosa Bolton: Fr.

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