• Merismatium nigritellum (Nyl.) Vouaux

There are no records for this species at present.

Known only from County Fermanagh, this rare species grows on the thallus of Placidium lachneum (syn. Catapyrenium lachneum). Like M. discrepans (described elsewhere) the spores lack a perispore. In M. nigritellum the spores are muriform and far larger (1525m long), with between 8 and 24 cells.

Key characteristics

  • Grows on the thallus of Placidium lachneum, rare
  • Spores muriform with 824 cells; perispore absent.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Merismatium nigritellum (Nyl.) Vouaux. [In] LichenIreland. Accessed on 2019-08-25.