Asteridiella solani is a species of fungus in the family Meliolaceae, first described by Daniel McAlpine in 1897,[1][2] who gave the following description: On upper and under surfaces of leaves, leaf-stalks and branches; forming densely crowded, minute, black, generally orbicular, often confluent, easily detachable, brittle crusts, with surface of leaf beneath of a pale brown or pale reddish colour.

Mycelium composed of an interosculating network of delicate, colourless, septate, luxuriantly branched hyphae, about 3 μ broad, and attached to matrix, gradually passing into the stouter coloured hyphae above it.

Perithecia seated on crust in clusters, depressedly globose, black, rough with warty spines, 130-330 μ, the latter being the average full-grown size.

Sporidia brown, oblong, 4-septate, slightly constricted at septa, rounded at both ends, 36-44 x 14-15 μ. Pycnidia globose, golden-brown, opening by circular mouth and wall composed of small polygonal cells 100-140 μ, along with perithecia.

The sporidia, which are at first colourless, then greenish and finally brown, often germinate even within the perithecium either from one or more segments.