Irish lichens

Acarospora smaragdula

Order: Acarosporales       Family: Acarosporaceae

Species: Acarospora smaragdula

Growth type crustose.
Photos: on upland rocks. Ballingeary area, Co. Cork, SW Ireland.

Variable. Thallus usually pale creamy brown but yellowish-green on copper-rich rocks. Scattered flat to convex areoles that can form continuous crust. There are usually 3-7 minute apothecia in each areole, red-brown to blackish, margins absent or well developed. Asci >100-spored, spores 2-5 x 1-2 Ám. Micro photo below.
K+ red, C-, KC+ red, P+ yellow. Rarely K- or KC-

Occurs on sheltered slightly base-rich siliceous rocks, sites rich in heavy metals and on sheltered stones below metal run-off.

Similar: A. fuscata. Brownish areoles, K-, C+ red, KC+ red


Acarospora smaragdula


Acarospora smaragdula

Microscope photograph
Acarospora smaragdula, ascus and spores
Acarospora smaragdula. November 2009 and April 2012

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