"It is distinguished from the other known species of Physarum by the strongly reticulated spores. Its nearest ally is perhaps P. psittacinum which it resembles in having orange-red lime-knots and in the sporangium-wall being studded with orange crystalline disks." Lister.

Reported collected once only; New Zealand.

Physarum straminipes List.

Plasmodium white; sporangia greyish-white, obovoid or wedge-shaped, .7 mm. in diameter, clustered or scattered, stipitate or sessile, when stipitate stalks long, weak; peridium membranous, pale purple; capillitium a persistent rigid net, the nodules white, rounded, sometimes aggregate as a pseudo-columella; spores purple-brown, 10–11 µ, warted, the papillae in definite patches.

Related to P. compressum.

Reported from England; Germany.

Physarum crateriforme Petch.

Sporangia gregarious, globose, clavate or crateriform, sessile or stipitate, white; stalk when present opaque conical, black below, white above, in crateriform sporangia entering and developed as a columella; capillitium various, strongly calcareous, the nodules either grouped in a pseudo-columella, or in globose sporangia, rod-like, ascending; spores closely spinulose, 11–15 µ.