Order: Lecanorales       Family: Parmeliaceae Species: Parmotrema crinitum Growth type foliose. Photos: On Alder trunks. Glengarrif woods, Cork, SW Ireland. Loosely attached pale-grey thallus. Incised, over-lapping lobes with distinctive mix of black cilia and coralloid isidia on margins and surface. Underside black with rhizines in centre and brown, bare margins. Apothecia very rare, brown discs with isidiate margins. Medulla: K+ yellow, P+ yellow-orange, UV- An 'Old forest' indicator species, found on well-lit mossy rocks and tree trunks. Most frequent in the west of Ireland. Similar: Parmotrema perlatum is sorediate, isidia are absent. Parmelinopsis horrescens has smaller thallus, medulla K-

Parmotrema crinitum. Glengarriff woods, Co.Cork. January 2009 and April 2010