Irish lichens
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Order: Arthoniales Family: Roccellaceae
Species: Schismatomma umbrinum Photos: On rock. Killarney NP, Co. Kerry, SW Ireland. Thick, yellowish-brown thallus surrounded by a wide purplish-brown prothallus, mosaic-forming or in rosettes. Central parts of thallus become concolorously sorediate. Apothecia are rare, discs blackish-brown. Chemical reactions negative, medulla and abraded soralia UV+ ice-blue. Found on vertical sides and underhangs of sheltered siliceous rocks in old, humid woodlands. Rare, Irish records only from Co. Kerry. |
Schismatomma umbrinum. November 2010