Physarum megalosporum T. Macbr. 1922

Physarum megalosporum Macbr. N. Am. Slime-Moulds
ed. 2. 63. 1922.
Physarum melanospermum Sturgis, Mycologia 9: 323. 1917. Not P. melanospermum Pers. 1794.
Sporangia gregarious, short-stipitate or sessile, depressed-annulate or umbilicate above, rugulose, white above or rarely touched with rose, darker below, 0.4-0.7 mm. in diameter; stalk, when present, thick, black, rough; hypothallus black, inconspicuous; columella none; capillitium strongly calcareous, the nodes white, irregular, sometimes massed toward the center, the connecting threads short, hyaline ; spores black in mass, dark purplish-brown by transmitted light, with a paler area of dehiscence, densely spiny, 12.5-16 fi in diameter.
Type locality: Colorado. Habitat: Dead leaves and wood. Distribution: Iowa, Kansas, Colorado.

Physarum megalosporum Macbr. N. Am. Slime-Moulds
ed. 2. 63. 1922.
Physarum melanospermum Sturgis, Mycologia 9: 323. 1917. Not P. melanospermum Pers. 1794.
Sporangia gregarious, short-stipitate or sessile, depressed-annulate or umbilicate above, rugulose, white above or rarely touched with rose, darker below, 0.4-0.7 mm. in diameter; stalk, when present, thick, black, rough; hypothallus black, inconspicuous; columella none; capillitium strongly calcareous, the nodes white, irregular, sometimes massed toward the center, the connecting threads short, hyaline; spores black in mass, dark purplish-brown by transmitted light, with a paler area of dehiscence, densely spiny, 12.5-16 y. in diameter.
Type locality: Colorado. Habitat: Dead leaves and wood. Distribution: Iowa, Kansas, Colorado.