Fungi Outer Hebrides

Family: Collemataceae

Collema fuscovirens (With.) J.R. Laundon

Type: Foliose

One of the "jelly lichens" with a deep-lobed thallus, dark olive-green to blackish and paler below. Slightly translucent when wet. The minute, crowded isidia give the thallus a scabrid, matt appearance when dry. Found on well-lit, wet (often running water) limestone. Uncommon in the islands where the rocks are predominantly siliceous.

Rebecca Yahr

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