Species: Collema auriforme
Photos: On limestone rock and urban walls. Ireland.
Dark greenish-brown, smooth, erect lobes with patches of coarse globular isidia. Lobes are swollen and jelly-like when wet, becoming black and shrivelled when dry. Apothecia rare, margins isidiate.
Common on moist, shaded mortared walls, tombstones and mossy calcareous rocks. Chemical reactions negative.
Similar: Collema fuscovirens and Leptogium plicatile
Collema auriforme. December 2008 and April 2009