Microscopic: spores 60-105 x 7-9 microns, the majority 75-95 microns, in parallel fascicle in ascus, clavate; dark-fuliginous, 7-septate, usually slightly curved; asci 8-spored, rather stout, up to 170-200 microns long and diameter of 20-22 microns; paraphyses slightly longer than asci, about 3 microns thick in lower part, 5-9 microns thick in upper part; typically clavate in distal third, closely septated into cells rarely more than twice as long as broad, usually constricted at the septa and the cells often swollen so as to give a moniliform appearance, brown in upper part, straight, or curved; with septate hairs up to 100 microns long, septate, single or agglutinated into groups, (Seaver), spores (45)55-78(90) x 6-8 microns, straight or somewhat curved, dark brown; asci 8-spored, 150-190 x 20 microns, clavate; paraphyses "exceeding asci, straight or somewhat curved, above, hyaline or light brown below, light to dark brown and closely septate above, the upper cells various enlarged" in the different varieties (see NOTES), (Mains)
Habitat and Range
SIMILAR SPECIES
Geoglossum nigritum (here considered Geoglossum umbratile) has paraphyses that are remotely septate, scarcely moniliform, the thickening confined to the terminal cell. Geoglossum fallax is brown, rarely black, and has different paraphyses. Glutinoglossum glutinosum is viscid-gelatinous. Trichoglossum hirsutum and Trichoglossum velutipes are hirsute from setae. There are four BC collections at the University of British Columbia of Geoglossum simile, which has also been known as a variety of Geoglossum glabrum.
Habitat
single or rarely clustered, gregarious, on very rotten wood, logs, stumps, or rich humus, rarely on soil, (Seaver), scattered to crowded, on soil or in the case of var. inflatum also in sphagnum or other mosses, (Mains)