Collemataceae Lathagrium auriforme (Collema auriforme) Growth type foliose. Chemical results: Negative Very common on mossy calcareous rocks and on moist, shaded, mortared walls and tombstones. Thallus swollen and jelly-like when wet, black and shrivelled when dry. Dark green-brown, +/- erect lobes with coarse globular isidia. Apothecia rare, with isidiate margins. Spores sub-muriform, 26-36 x 8-13 µm. Pycnidia marginal or laminal, conidia colourless. Micro photograph of pycnidia and conidia below Similar: Collema fuscovirens and Leptogium plicatile

Microscope photograph

Collema auriforme
Dorset. January 2014, December 2016