Physarum robustum

On decaying wood or plant debris, with sessile or shortly stalked sporocarps up to 1.5 mm in total height, with subglobose sporothecae 0.5 to 1 mm in diameter, greyish white; stipe (when present) very short, only up to 0.3 or 0.4 mm, ochre with a darker base, and dark brown spore mass.

Peridium single, covered with lime scales, white to brown at the base where it persists as a collar, with irregular dehiscence.

Columella absent.

Capillitium abundant, formed by hyaline filaments radiating from the center of the sporotheca, with sparse white lime nodes.

Spores globose to subglobose, pale violaceous brown under the microscope, 11 to 13 µm in diameter, with an apparently thick and slightly verrucose wall, ornamented with irregular darker warts.

Herbarium material available: JTP2432/25.