• Placynthium dolichoterum (Nyl.) Trevis.
Placynthium dolichoterum
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This lichen is identical in almost every respect to the common calcicole species P. nigrum. It is distinguished under the microscope by the three- to five-septate, fusiform, worm-like spores. It has a montane limestone habitat. In Ireland, the species is very rare.

Key characteristics

  • Spores three- to five-septate (one- to three-septate in P. nigrum)
  • Montane habitat.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Placynthium dolichoterum (Nyl.) Trevis.. [In] LichenIreland. Accessed on 2018-07-19.