Fungi Outer Hebrides

Family: Collemataceae

Collema tenax (Sw.) Ach.

Type: Foliose

Variable, rosette forming, dark greenish thallus. Very swollen when wet. Numerous red-brown apothecia often obscure the lobes of the thallus. Common on mortar in walls

Christine Johnson

Smith et al. editors (2009) The Lichens of Great Britain and Ireland
Dobson (2018) Lichens: an Illustrated Guide to the British and Irish Species
Ahti et al. editors (2012) Nordic Lichen Flora. Volume 3: Cyanolichens