Irish lichens

Opegrapha cesareensis

Order: Arthoniales       Family: Opegraphaceae

Species: Opegrapha cesareensis

Growth type crustose. Chemical reactions negative
Photos: On coastal rocks. Allihies, Co. Cork, SW Ireland.

The thallus is usually thin and smooth, whitish or pale grey and often tinged lilac with prominent scattered, simple lirellae (to 2mm long). A thin, dark prothallus is often present. Spores are 4-5(-6) septate, 13-24 x 4-5 Ám. Microscope photograph below.

Occurs on damp, shaded siliceous coastal rocks in gullies and crevices and below cliff overhangs

Similar: Opegrapha calcarea. Spores 3-septate

Opegrapha cesareensis

Opegrapha cesareensis

Microscope photograph
Opegrapha cesareensis
Opegrapha cesareensis. March 2012

All images used are copyright. Please contact me if you find errors.