Irish lichens

Verrucaria striatula
Order: Verrucariales       Family: Verrucariaceae

Species: Wahlenbergiella striatula (Verrucaria striatula)

Growth type crustose.
Photos: On maritime rock below HWM. Courtmacsherry, SW Ireland

Very variable. Grass-green to dark dull green, thin, uncracked thallus, translucent when wet. Usually with small black spots and shiny ridges (ridges sparse or absent in shade). The prominent perithecia are often irregular in shape.

Coastal on siliceous rocks between mid and high water mark. Most records from western Irish coasts. Chemical reactions negative.

Verrucaria striatula

Verrucaria striatula
Verrucaria striatula. March 2009

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