Summary:
Features include a disc-like fruitbody that is brown to brownish black, sometimes with an olive tinge, thin brittle brownish flesh, absent or almost absent stem, growth on damp soil, and microscopic characters.
Peziza brunneoatra is found at least in WA, OR, ID, CA, and CO, (Larsen), and NY, IA, and Europe, (Seaver), including France (Dennis). Collections from BC were deposited at the University of British Columbia determined by B.J. Macdonald and by V.J. Krajina.
Upper surface:
0.5-2.5cm across, cup-shaped becoming flattened when old; spore-bearing upper surface brown to brownish black, sometimes with olive tinge, smooth, (Arora), expanding and when mature becoming scutellate to disc-shaped, not usually exceeding 1-2cm across; spore-bearing upper surface at first concave, becoming flat, finally a little convex, often umbilicate, brownish black with a slight green tinge, (Seaver), up to 1cm across, disc soon flat, with slightly raised even margin; spore-bearing upper surface blackish brown, (Dennis)
Flesh:
thin, brittle; brownish, (Arora), rather thick; reddish brown, (Dennis), thin, fragile; brown, (Schalkwijk-Barendsen)
Underside:
colored as upper surface or slightly paler or redder (red-brown), (Arora), dark brown, almost smooth, (Dennis)
Stem:
absent or present only as a very short narrowed base, (Arora), without stem (Seaver, Dennis)
Microscopic:
spores 16-22 x 8-12 microns, elliptic, smooth becoming roughened (warty) or partially reticulate when mature, with 1 or 2 oil droplets, (Arora), spores 20-22 x 10-11 microns, at first smooth, developing rather conspicuous warts about 2 microns in diameter, very faintly yellowish or olive, with 2 conspicuous oil droplets or more rarely 1, uniseriate or occasionally crowded, parallel with ascus or oblique; asci 8-spored, reaching a length of 300-350 microns and a width of 15-17 microns, cylindric in upper part, tapering rather abruptly in lower part into stem-like base; paraphyses rather strongly widened in upper part, reaching width of 7-8 microns at tip, yellowish brown, (Seaver), spores 14-18 x 9-11 microns, elliptic, finely warted, packed with numerous small oil droplets; asci up to 300 x 17 microns; paraphyses slender, slightly widened in upper part, with oily contents, (Dennis)
|
