Irish lichens
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Order: Incertae sedis Family: Hymeneliaceae
Species: Tremolecia atrata 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 µm. 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. September 2009