Summary:
Features include a small cup with yellow brown to orange brown to red-brown interior, its margin white-scalloped or white-toothed, the exterior colored more or less as the interior, sometimes lighter toward margin and dusted with white, a stem up to 1.4cm long when present, and growth on burnt ground or burnt wood. In the Pacific Northwest, Geopyxis collections may be determined with confidence as Geopyxis carbonaria if long-stemmed and on burned areas. PNW collections may be determined with confidence as Geopyxis deceptiva group if without a stem and off burned areas, or even (as is more common) on burned areas if stem is absent and spores mostly average about 16.7 microns long. Placement of the genus in Pyronemataceae is not certain.

Odor:
none or fetid (Wang, X.-H.), sometimes smells a little like sulphur (M. Beug, pers. comm.)

Microscopic:
spores 12.0-13.5-16.5-18.0 x 6.5-7.4-9.6-11.0 microns (the middle two values being the lowest and highest mean value for the measured collections), "subfusiform to fusiform", rarely elliptic with round ends, "smooth, rarely finely warted (seen on surface using x1000 bright field and DIC), with aggregated granules, slightly to moderately refractive"; asci 190-230(250) x 9-13 microns, presumably 8-spored; paraphyses 1.5-3 microns wide at the basal and middle parts, 2.5-5(6) microns wide at apices, "of equal width or slightly enlarged toward apices, some subclavate", "straight, rarely slightly bending, rarely with a small knob near the apex, with small guttules and granules in the whole length or middle-upper portion, mostly strongly refractive, rarely slightly refractive with sparse contents, when fresh with scattered yellowish brown granules and droplets", dissolving or becoming colorless to pale yellow in Melzer''s reagent, (Wang, X.-H.), spores (11)12-15(17) x 6.5-8(9) microns, elliptic to slightly fusiform, smooth, colorless, without droplets; asci 8-spored, 180-210(250) x 10-11 microns; inamyloid; paraphyses slender, cylindric, "septate, forked toward the base, tips with slight clavate thickenings, sometimes rather lobed with gnarled outgrowths", (Breitenbach who illustrates the paraphyses forking upwards from near the base), spores 13-16 x 6-8 microns, narrowly elliptic, rather pointed at each end, smooth, without oil droplets; asci up to 200 x 10 microns; paraphyses slender, slightly clavate, (Dennis), spores 11-18 x 6-9 microns, do not contain prominent oil droplets, (Trudell)

Notes:
Collections were examined from OR, AK, CA, CO, QC, Czech Republic, Denmark, Finland, Norway, Poland, Sweden, India, and Japan, (Wang, X.-H.). It has been found in BC, WA, OR, ID, and also AB, CA, CO, MT, and UT, (Larsen).

Synonyms and Alternate Names:
Flagelloscypha eruciformis (P. Micheli ex Batsch) Singer
Lachnella eruciformis (P. Micheli ex Batsch) W.B. Cooke