Agonimia tristicula Incertae sedis
Agonimia tristicula

Growth type squamulose
Chemical results negative

Overgrows moss on mortared walls and calcareous soils, occasional on bark of base-rich trees.

Thallus of tiny, flattened green squamules, greyish-brown when dry, with minute papillae on upper surface. Very small, black, barrel-shaped apothecia are often half-hidden amongst the squamules. Asci 1-2 spored, the spores colourless becoming pale yellow-brown, muriform 70-120 x 25-50 Ám. Microscope photograph below.

Similar: A. octospora. Corticolous, less flattened squamules. Asci 8-spored

Agonimia tristicula

Agonimia tristicula

Microscope photograph
Agonimia tristicula, spores
Agonimia tristicula
Wool, Pamphill and Wareham, Dorset. February 2013, November and December 2016

All images used are copyright. Please contact me if you find errors.