Description: Identical in all but colour to H. ochroleucum var. porphyrium (described elsewhere) in the leprose- or floury-sorediate thallus surrounded by a broad white cottony margin. In var. ochroleucum the thallus has a distinctive pale yellow-green hue compared with the grey-white tones of var. porphyrium. They retain this distinction even where growing together on the same wall. Dry sheltered sandstone walls (for example, sides of church buildings) are especially favourable. Both varieties are frequent in Ireland.

Key Identification Features:

• Thallus densely leprose or sorediate, pale yellow-green, spreading like a felty layer sometimes covering metres of exposed wall stone
• Thallus K+ pale-yellow with a white cottony border.

Original text submitted by Vince J. Giavarini

Distribution Map from NBN: Haematomma ochroleucum at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Haematomma ochroleucum at iNaturalist World Species Observations database.