Irish lichens

Japewiella tavaresiana

Order: Lecanorales       Family: Bacidiaceae

Species: Japewiella tavaresiana

Growth type crustose.
Photos: On Willow. Gougane Barra, Cork, SW Ireland.
Identified by John Douglass

Immersed or thin white thallus, usually with a thin, dark prothallus. Reddish-brown discs darkening to dark brown or black. The ascus is 8-spored with simple spores 13-18 x 8-10 Ám. Micro photo below.

On bark and twigs of smooth barked trees, most frequent on Salix in damp woods and willow carr. Often with Lecanora jamesii.
Chemical reactions usually negative, very rarely K+ pale yellow.

Japewiella tavaresiana

Japewiella tavaresiana

Microscope photograph
Japewiella tavaresiana, spores
Japewiella tavaresiana. August 2009 and January 2012

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