Irish lichens
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Order: Arthoniales Family: Roccellaceae
Species: Cresponea premnea Photos: Killarney National Park, Co. Kerry, SW Ireland. Identified by John Douglass Thallus evanescent or thin and greyish-green. Apothecia with large black discs, +/- green-pruinose, margins persistent, +/- crenate. Pycnidia occasional, usually in groups or lines. Asci 8-spored, spores 5-septate, 18-25 x 5-7 µm, usually curved and pointed. Chemical reactions negative. Found on well-lit, dry, rough bark of mature Oak, Yew and Beech in old woods and parks. Most Irish records are from the SE. Sometimes found with Lecanographa lyncea |
Cresponea premnea November 2009