• Haematomma ochroleucum (Neck.) J.R.Laundon [17]
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Haematomma ochroleucum
© Mike Simms
Haematomma ochroleucum
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(Map updated: 11 August 2009)

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 characteristics

  • 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

 Simms, M. J., (2016). Haematomma ochroleucum (Neck.) J.R.Laundon [17]. [In] LichenIreland. Accessed on 2020-07-06.