Physarum leucopus

Fungus / parasite
colony of Verticillium anamorph of Verticillium rexianum parasitises sporangium of Physarum leucopus

Physarum leucopus Link, Ges. Nat. Freunde Berlin
Mag. 3:27. 1809.
Physarum bullatum Link, Ges. Nat. Freunde Berlin Mag. 3: 27. 1809. Didymium leucopus Fries, Syst. Myc. 3: 121. 1829.
Sporangia gregarious, stipitate, globose, white, about 0.5 mm. in diameter; peridium calcareous, the lime in small, frosty particles, suggesting Didymium; stalk white, calcareous, sulcate, brittle, tapering upward, about equal to the sporangium, sometimes very short; columella none; capillitium rather lax, the nodes large, angular, white, connected by long, hyaline threads; spores black in mass, pale violet-brown by trnasmitted light, distinctly warted, 8-10 p in diameter; Plasmodium white, often tinted with blue, green, or yellow.
Typb locality: Germany.
Habitat: Dead leaves and wood.
Distribution: Maine to Ontario and Oregon, south to Panama; cosmopolitan.