Irish lichens

Tremolecia atrata

Order: Incertaeásedis       Family: Hymeneliaceae

Species: Tremolecia atrata

Growth type crustose.
Photos: On upland rock. Gougane Barra, Co. Cork, SW Ireland.

Distinctive rust-coloured, cracked-areolate thallus, sometimes appearing +/- black in very exposed, well-lit locations. Numerous smooth, immersed black apothecia, discs slightly concave.
Asci 8-spored. Spores simple, colourless, 10-16 x 5-9 Ám.

Can be locally common in upland areas on hard siliceous, iron-rich rocks. Chemical reactions negative.

Similar: Rhizocarpon oederi. Gyrose, knot-like apothecia.


Tremolecia atrata


Tremolecia atrata
Tremolecia atrata. September 2009

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