Irish lichens

Schismatomma umbrinum

Order: Arthoniales       Family: Roccellaceae

Species: Schismatomma umbrinum

Growth type crustose.
Photos: On rock. Killarney NP, Co. Kerry, SW Ireland.
Identified by John Douglass

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

Schismatomma umbrinum

Schismatomma umbrinum
Schismatomma umbrinum. November 2010

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