Physarum confertum

Physarum confertum Macbr. N. Am. Slime-Moulds
ed. 2. 64. 1922.
Physarum atrum sensu Morgan, Jour. Cine. Soc. Nat. Hist. 19 : 27. 1896. Not P. atrum Schw. 1832 .
Sporangiate, subglobose, or somewhat elongate, sessile, small, 0.2-0.4 mm. in diameter, closely gregarious, often confluent or heaped, rarely plasmodiocarpous, dull violaceous-brown; peridium thin, more or less transparent, nearly limeless or sprinkled or reticulated with lime; capillitium scanty, the nodes small, elongate, rounded, white; columella none; spores violetbrown, minutely warted, 1 1-13 m in diameter; Plasmodium white or yellowish.
Typk locality: North Carolina.
Habitat: Pine needles, moss, twigs, and dead wood; often in Sphagnum bogs. Distribution: Nova Scotia to Ontario, south to North Carolina and Mississippi; Europe.