Physarum murinum Lister 1894

Physarum murinum Lister, Mycet. 41. 1894
Physarum Braunianum sensu Lister, Jour. Bot. 29: 259. 1891. Not P. Braunianum De Bary 1875. Cytidium Ravenelii Morgan, Jour. Cine. Soc. Nat. Hist. 19: 10. 1896.
Physarum Ravenelii sensu Macbr. N. Am. Slime-Moulds 48. 1899. Not P. Ravenelii Massee, 1892. Physarum heterosporum Widder, Verh. Zool.-Bot. Ges. Wien 73: 159. 1923.
Sporangia stipitate, gregarious, globose, about 0.5 mm. in diameter, occasionally sessile or plasmodiocarpous, ashy-brown or drab; peridium membranous, encrusted with a rugose layer of lime; stalk cylindric, pale brown, furrowed, calcareous, brittle, usually equaling or exceeding the sporangium; hypothallus inconspicuous; columella short, hemispheric or bluntly conic; capillitium dense, hyaline, brownish or orange-brown, the nodes rounded or angular, usually small, brownish or orange; spores brown in mass, bright lilac by transmitted light, minutely warted, the warts somewhat clustered, 8-10 fx in diameter.
Type locality: Eastern United States.
Habitat: Dead wood and leaves.
Distribution: Eastern United States to Missouri and Kansas, and in Washington; Europe.