Irish lichens

Parmelinopsis horrescens

Order: Lecanorales       Family: Parmeliaceae

Species: Parmelinopsis horrescens (Hypotrachyna 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: P. minarum, laminal cilia absent, medulla C+ pink.

Parmelinopsis horrescens

Parmelinopsis horrescens. November 2010

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