Irish lichens

Acarospora smaragdula
Family: Acarosporaceae

Species: Myriospora smaragdula (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

All images used are copyright. Please contact me if you find errors.