Order: Lecanorales Family: Parmeliaceae
Species: Parmelinopsis horrescens
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: P. minarum, laminal cilia absent, medulla C+ pink.
Parmotrema crinitum, larger thallus, medulla K+ yellow
Parmelinopsis horrescens. November 2010