Summary: Features include 1) a minute, disc-shaped fruiting body with a mealy brown covering and a flat, yellowish to brownish black upper spore-bearing surface, 2) growth on dogwood (Cornus), and 3) microscopic characters. Seaver''s illustrations appear to show 1-septate and 3-septate mature spores, and the granular coating on the upper surface.
Microscopic: spores 28-34 x 10-13 microns, elliptic, irregularly crowded in the ascus; asci 8-spored, reaching a length of 120 microns and a width of 27 microns, clavate; paraphyses filiform [thread-like], slightly enlarged in upper part; accompanied by a Myxosporium that appears to be its conidial stage, the pycnospores 33-36 x 13-15 microns, elliptic and densely filled with granules, (Seaver)
Notes: Pezicula corni is found in ID, CA to OR and ON, (Seaver). Collections from BC were deposited at Pacific Forestry Centre (determined by J. Groves).
Habitat and Range
Habitat
single or cespitose, on Cornus alternifolia (alternate-leaf dogwood), Cornus stolonifera (red-osier dogwood), and unnamed species of Cornus, (Seaver)
Synonyms
Synonyms and Alternate Names: Discina apiculata McKnight Discina olympiana Kanouse