Order: Peltigerales       Family: Collemataceae Species: Lathagrium auriforme (Collema auriforme) Growth type foliose. 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