Physarum citrinum Schumach. 1803

Physarum citrinum Schum. Enum. PI. Saell. 2: 201. 1803
Physarum compactum Ehrenb. Sylvae Myc. Berol. 26. 1818.
Physarum Schumacheri Spreng. Syst. 4 1 : 528. 1827.
Diderma citrinum Fries, Syst. Myc. 3: 100. 1829.
Physarum aureum var. E. chrysopus Lev. Ann. Sci. Nat. III. 5: 166. 1846.
Cytidium citrinum Morgan, Jour. Cine. Soc. Nat. Hist. 19: 9. 1896.
Sporangia gregarious or scattered, subglobose, somewhat flattened below, 0.4-0.7 mm. in diameter, bright to pale yellow, stipitate or rarely sessile, peridium thin, almost completely covered with small, calcareous scales; stalk stout, erect, furrowed, tapering upward, calcareous, yellow, opaque, very short to more than half the total height, arising from a small hypothallus ; columella small, conic, yellow; capillitium dense, delicate, the nodes numerous, small, rounded, yellow, the connecting threads hyaline, rigid; spores black in mass, violaceous under the lens, minutely punctate, 8-10 p. in diameter; Plasmodium yellow.
Type locality: Germany.
Habitat: Dead wood and moss.
Distribution: New England to Washington (state), south to Tennessee and Colorado; cosmopolitan.