Roccellaceae Dirina massiliensis f. massiliensis Growth type crustose Thallus K-, C+ red, KC+ red, P-, UV-. Medulla K-, C-, P-, UV+ pale yellow BLS conservation evaluation: NT NS This is the fertile form of Dirina massiliensis f. sorediata. The apothecia are +/- sessile, the discs white-grey to dark grey and white-pruinose. Asci are 8-spored, the spores 3-septate, 20-24 x 4-6 µm, fusiform and often curved. Microscope photograph below. Similar: Dirina fallax was only recently separated from Dirina massiliensis and only occurs on siliceous and acid rocks. It is thought to probably be widespread in western areas

Microscope photograph

Dirina massiliensis f massiliensis
On chert and limestone, Portland, Dorset. February 2016