LichenIreland
  • Schismatomma cretaceum (Hue) J.R.Laundon
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Schismatomma cretaceum
© Robert Thompson
Schismatomma cretaceum
© Mike Simms
Schismatomma cretaceum
© Mike Simms
Schismatomma cretaceum
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(Map updated: 11 August 2009)
Schismatomma cretaceum
© Mike Simms
 

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This chalky-white, crustose epiphyte forms extensive, thick, powdery patches towards the base of large, mature trees. Sometimes it can give the impression that the trees have been whitewashed. It is virtually unmistakable; it contains Trentepohlia as the algal partner, so will scratch golden with a fingernail. A dab of Potassium hydroxide (K) turns it pale-lemon yellow. It is relatively common in suitable habitats throughout Ireland.

Key characteristics

  • The massive, chalk-white stains on trees, golden scratch test, and K reaction will distinguish it
  • Mature, well-grown trees are favoured, for example, former parklands, golf courses, etc.

Original text submitted by Simon Davey

 Simms, M. J., (2016). Schismatomma cretaceum (Hue) J.R.Laundon. [In] LichenIreland.
http://www.habitas.org.uk/lichenireland/species.asp?item=19242 Accessed on 2017-12-15.