Arcyria occidentalis

Arcyria occidentalis (Macbr.) G. Lister in Lister,
Mycet. ed. 2. 245. 1911.
Lachnobolus occidentalis Macbr. N. Am. Slime-Moulds 188. 1899.
Sporangia ovate to subcylindric, short-stipitate or sessile on a constricted base, at first rosy, then brown or ochraceous, closely gregarious or crowded and often distorted by pressure but rarely heaped; peridium thin, metallic, persistent or somewhat fugacious above, the sides persisting as lobes; calyculus scarcely differentiated, irregular, more or less ribbed or fluted; stalk, when present, up to 1.5 mm. long, concolorous or darker, hollow, filled with sporelike cells; capillitium a loose, inelastic net, sometimes scanty, with many free ends and inflations, the threads mostlv 3-4 a wide, marked with warts and low transverse cogs often simulating spirals ;
spores very minutely spinu white, then rosy.
Type locality: Iowa. Habitat: Dead wood. Distribution: Maine to