Description: 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 Identification Features:

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

Original text submitted by Vince J. Giavarini

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

iNaturalist: Placynthium dolichoterum at iNaturalist World Species Observations database.