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

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