Incertae sedis Bilimbia sabuletorum Growth type crustose Chemical results negative. Upper part of hypothecium K+ reddish or purple On plant debris or over-growing moss on calcareous rocks, turf or mortared walls and on the shaded trunks of old trees. White or pale grey, coarse or scurfy granular thallus, sometimes evanescent. Convex, +/- rounded apothecia, very variable in colour; discs can be pinkish-brown, brown to dark brown or black. Spores 3-7 septate, 18-40 x 5-8 µm, perispore often finely-warted. Micro photograph below. Similar: Bilimbia lobulata is +/- squamulose with shorter spores. Bacidia bagliettoana. Darker discs, narrower acicular spores, 2-3 µm wide

Microscope photograph

Bilimbia sabuletorum
Lychett Matravers and Studland, Dorset. January 2014