Physarum nucleatum
Rex 1891
SPORANGIA: Total height 1 to 2 mm. Sporangia gregarious, rarely clustered, globose, about 0.5 mm. diam., stalked, erect or inclined, white.

STALK: Subulate or nearly cylindrical, 0.5 to 1.5 mm. long, wrinkled, pale buff or yellow, rarely reddish yellow or streaked with red, translucent above, without lime, and enclosing refuse matter at the base.

PERIDIUM: Rarely iridescent from absence of lime; sporangial wall membranous, with scattered in cluded clusters of white lime-granules.

CAPILLITIUM: a close, persistent network of very slender, colorless threads with minute, scattered, rounded, white lime-knots; in the center of the capillitium is usually a white, calcareous ball, 0.1 to 0.15 mm. diam., sometimes replaced by a cluster of irregular limeknots, occasionally absent entirely.

SPORES: Pale brownish lilac, minutely spinulose, 6-7 µm diam.


HABITAT: On dead wood and leaves.

Macro images:
Physarum nucleatum
Scale bar
Scale= 0.6 mm.
Hidden Forest
Slime Moulds