Order: Lecanorales       Family: Parmeliaceae Hypotrachyna horrescens (Parmelinopsis horrescens) Growth type foliose. Identified by John Douglass Photos: On Oak. Glengarriff woods, Co. Cork, SW Ireland. Tightly adpressed thallus with small, crowded, grey to grey-green lobes often forming rosettes to 4cm diam. Coralloid isidia, cylindrical or +/- flattened are mixed with black cilia and can spread to cover most of the thallus. Apothecia are very rare, discs reddish-brown with ciliate-isidiate margins. Pycnidia absent. Cortex K+ yellow. Medulla K-, C-, KC+ rose-red, P-, UV- 'Old forest' indicator species, found on neutral to acid-barked old trees and rocks in humid, long-established woodlands. In Ireland only recorded from Killarney, Co. Kerry, and Glengarriff, Co. Cork. Similar: Parmotrema crinitum, larger thallus, medulla K+ yellow

Hypotrachyna horrescens (Parmelinopsis horrescens). November 2010