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This maritime species of damp siliceous rock has a pale brown to white superficial thallus with conspicuous perithecia (with involucrellum) and ellipsoid spores in the middle range for Verrucaria species (19–25 x 9–11.5µm). It is apt to be confused with V. muralis (see elsewhere) which, though lacking a superficial thallus on limestone pebbles, usually has one when growing on siliceous rocks; this however is often poorly developed by comparison and the spores narrower. The species is poorly known and consequently records are few.
Original text submitted by Vince J. Giavarini
|Simms, M. J., (2016). Verrucaria internigrescens (Nyl.) Erichsen. [In] LichenIreland. |
http://www.habitas.org.uk/lichenireland/species.asp?item=20689 Accessed on 2016-12-03.