Badhamia affinis

Badhamia affinis Rost. Monog. 143. 1874
Badhamia orbiculata Rex, Proc. Acad. Phila. 1893: 372. 1893.
Sporangia gregarious, often crowded or caespitose, subspherical to discoid, often depressed in the center and umbilicate below, sessile or short-stipitate, or plasmodiocarpous, 0.5-1 mm. broad, pale gray or whitish, usually with a darker base; peridium membranous, with flakelike, scanty or abundant incrustations of lime, sometimes rugulose; stalk when present short, dark, plicate, 0.1-0.7 mm. tall; capillitium scanty, often denser at the center, white, the nodes somewhat expanded; spores black in mass, deep violet-brown by transmitted light, closely and densely spinulose, (12-) 14-16 (-18) /u in diameter; Plasmodium creamywhite.
Type locality: Chile.
Habitat: Bark, often mossy, of living and dead trees.
Distribution: New York to Colorado, south to Panama; cosmopolitan.