Irish lichens

Verrucaria

Order: Verrucariales       Family: Verrucariaceae

Species: Verrucaria internigrescens QQ

Growth type crustose
Photos: Above HWM, Allihies, Co. Cork, SW Ireland.
Correction: Photos shown are of Verrucaria viridula

Thallus superficial, whitish-grey or pale brown. Perithecia are not covered by thallus, 0.32-0.78 mm diam with a well developed involucrellum. Spores (15-)19.5-25(-30) x (7.5-)9-11.5(-13) Ám.
Chemical reactions negative

Coastal on damp siliceous rocks in the upper maritime zone.

Similar: Verrucaria muralis. Spores usually narrower.



Verrucaria March 2012

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