Haematommataceae Haematomma ochroleucum var. porphyrium Growth type crustose Chemical results: K+ pale yellow, C-, P+ pale yellow, UV-. Apothecia K+ purple Can form large patches on dry, siliceous or slightly calcareous walls, gravestones and rocks Whitish or grey-white thallus with a distinctive 'fringed' white prothallus. When present the scattered discs are red. Haematomma ochroleucum var. ochroleucum has a yellowish-grey thallus. Phlyctis argena is usually corticolous, K+ yellow > red

Haematomma ochroleucum var porphyrium
St. Huberts, Corfe Mullen, Dorset. January 2014