• Collema undulatum Laurer ex Flot.
Collema undulatum
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(Map updated: 11 August 2009)

C. undulatum is a rare ‘jelly’ lichen of exposed limestone rocks. In general appearance it resembles C. cristatum (large, dark thallus and channelled lobes with wavy margins). Discs are numerous often crowded with exciple, level with, or lower than, that of the disc. The spores are three-septate and fusiform-ellipsoid. Forms with globose or granular isidia belong to the var. granulosum. In Ireland, it is only known from the Burren, though there are earlier records from stone walls in Connemara, County Galway.

Key characteristics

  • Like C. cristatum (described elsewhere) but with three-septate spores, concave lobes and exciple never above the level of the disc
  • On the hard limestones of exposed ridges.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Collema undulatum Laurer ex Flot.. [In] LichenIreland. Accessed on 2019-01-23.