Opegrapha herbarum Roccellaceae
Opegrapha herbarum

Growth type crustose
Chemical reactions negative

Found on acidic to basic, smooth, often shady bark, also sometimes on plant stems (especially brambles) and sandstone.

Thin or inconspicuous pale grey, brownish or olive-green thallus. Lirellae usually simple, less frequently branched, the discs becoming fully open, rarely pruinose. Pycnidia are very rare. Spores 3-septate, 18-25 x 5-7 Ám with a thin perispore. Microscope photograph below.

Similar: Non-pruinose forms of Opegrapha ochrocheila have smaller spores without a perispore, 3-septate


Opegrapha herbarum

Opegrapha herbarum

Opegrapha herbarum

Microscope photograph
Opegrapha herbarum, spores
Opegrapha herbarum
Arne and Badbury Rings, Dorset. February 2014, January 2017

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