Irish lichens

Enterographa crassa
Order: Arthoniales       Family: Roccellaceae

Species: Enterographa crassa

Growth type crustose.
Photos: The Burren, Co. Clare and Co. Cork, Ireland

Grey, brown or olive-greenish thallus with black prothallus. Thallus can be smooth or lumpy, often forming mosaics. The minute dark-brown, embedded, apothecia (0.1-0.3mm) form dots or thread-like lines. The asci are 8-spored, spores 5-7 septate, 28-38 x 4-6 Ám. Microscope photographs below.
Chemical reactions negative.

Common on shaded trees, occasional on damp, sheltered rocks.

Similar: E. hutchinsiae. Usually on rock, apothecia 0.3-1mm long.


Enterographa crassa


Enterographa crassa


Enterographa crassa


Enterographa crassa

Microscope photographs
Enterographa crassa, ascus and spores


Enterographa crassa, ascus and spores


Enterographa crassa, microscope photo
Enterographa crassa

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