Irish lichens

Verrucaria halizoa

Order: Verrucariales       Family: Verrucariaceae

Species: Verrucaria halizoa

Growth type crustose
Photos: Coastal rocks, Allihies, Co. Cork, SW Ireland.
Identification confirmed by John Douglass

Small patches of smooth, thin, olive-greenish (occasionally brown) thallus that becomes translucent when wet, occasionally with a thin black prothallus. The perithecia are +/- hemispherical, spores 8-11 x 3.5-5Ám. Pycnidia are rare. Microscope photograph below.

Coastal in sheltered crevices and on shady rocks in the mid-littoral (barnacle) zone, often found among Verrucaria mucosa and Verrucaria striatula

Verrucaria halizoa

Microscope photograph
Verrucaria halizoa
Verrucaria halizoa . March 2012

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