Kuorivitinen

Didymium crustaceum Fries, Syst. Myc. 3: 124. 1829
Didymium confiuens Rost. Monog. 164. 1874.
Sporangia short-stalked or sessile, closely aggregated, globose or deformed by pressure, 0.7-2 mm. in diameter, pure white; peridium double, the outer wall limy, fragile, distant, sometimes forming a continuous crust over all or part of the cluster, the inner wall membranous, transparent, scantily clothed with large stellate crystals; stalk when present pale buff, weak, 0.2-0.4 mm. high, often concealed by the outer crust; columella small, white or pale buff, sometimes nearly obsolete; hypothallus membranous, often more or less limy, not prominent; capillitium rather rigid, sparsely branched, except at the tips, and with few anastomoses, pallid or purplish; spores black in mass, dark violet-brown by transmitted light, strongly warted, 10-14 (-16) y. in diameter; Plasmodium white. Type locality: Europe.
Habitat: Dead wood, twigs and leaves.
Distribution: Pennsylvania and southern Canada to Washington, south to North Carolina and Colorado; South America; Europe; Japan; Hawaii.