Lichenothelia scopularia (Nyl.) D. Hawkw.

     Thallus black, at first split in the form of dotted lines or large short filaments, then more homogeneous and bordered with slightly domed areoles arranged radially towards the margin, 0.5-2 cm in diameter. This thallus typically forms black spots with a very distinct margin (as if made with a punch), very visible on the thallus of the host. Perithecia black, few, more or less immerged, 0.1-0.3 mm in diameter with a very large and very open ostiole. Spores brownish when mature, long ovoid, 1-septate, 12-21 x 5-11 µm. Species parasitizing in the few places where it is present and apparently without apparent specificity, the thalli of many crustose lichens of siliceous rocks in well-exposed, hot and dry places.

N.B. This species has been reported, but rarely, in a "free" state and not appearing to parasitize any crustose lichen present in the vicinity.