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This species is different from D. difforme chiefly in the rougher and somewhat banded epispore.

Very distinct from P. newtoni in color, form, habit, epispore, etc.

Differs from D. squamulosum in the reticulate epispore.

Sporangia gregarious, upon a common hypothallus, erect, small, cylindric, stipitate; stipe black, extremely short, about half a millimetre; columella reaching the apex; capillitium violet-black, darker near the surface, forming a complete superficial net at the lower part of the sporangium only, elsewhere irregular or vanishing; spore-mass nearly black; single spores violet-black under the lens, the epispore spinulose and reticulate, about 8 �.

The markings on the epispore are sufficient to identify it.