Order: Verrucariales       Family: Verrucariaceae Species: Dermatocarpon leptophyllodes Growth type squamulose to foliose. Photos: On lakeside rocks. Gougane Barra and Inchigeela, Cork, SW Ireland. Specimen left and immediately below confirmed by John Douglass Very small and tightly crowded, greyish-brown thallii 2-7mm, each with a central holdfast. The lobes are sometimes pruinose. Immersed perithecia with clearly visible ostioles. Can form large, dense colonies sometimes resembling a cracked areolate crust. Occurs on flat-topped siliceous rocks in and beside streams, rivers and upland loughs. SW Ireland. Chemical reactions negative. Similar: Dermatocarpon meiophyllizum

Dermatocarpon leptophyllodes. August 2009