Order: Peltigerales       Family: Collemataceae Species: Leptogium cochleatum Growth type foliose. Photos: On hazel. Cathair Chomáin, the Burren, W Ireland. BLS Burren meeting 2009 Large greyish-green thallus with wavy, convoluted, fine-ridged lobes. Sessile red-brown apothecia are usually present but isidia are absent. The spores are muriform, 20-35 x 12-16 µm. Occurs mainly on trunks of Ash and Hazel in damp, shady woodland, also found on mossy rocks. Rare, most Irish records are from the Burren, Co. Clare. Chemical reactions negative.

Leptogium cochleatum. BLS Burren meeting, April 2009