Gyalectaceae Belonia nidarosiensis Growth type crustose Thallus: chemical reactions negative. Hymenium I+ blue > red-brown Often over-looked on mortar and limestone on dry, shaded, vertical surfaces sheltered from direct rainfall. Favours north and east church walls. Thin, finely powdery-granular, pinkish-orange or reddish thallus. Apothecia rare, orange-red, widely scattered in thalline warts. Spores muriform tapering to thin tail. Can be very difficult to separate from free-living Trentepohlia (algae) Similar: Opegrapha gyrocarpa. On siliceous rocks, soralia C+ red

Trentepohlia (algae)

Belonia nidarosiensis
Lychett Matravers, Dorset. January 2014