• Arthopyrenia cinereopruinosa (Schaer.) A.Massal.
Arthopyrenia cinereopruinosa
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This ‘bark pimple’ species with an immersed thallus and spherical discs (perithecia) can be distinguished in the field by the glazed-over appearance of the discs caused by a thin cover of bark cells. Under the microscope the one-septate spores (14.5-22ųm long) are doubly constricted, giving the spore a twin-hourglass appearance. It grows chiefly on smooth bark, especially ash. Scattered but rare in east and midland Ireland.

Key characteristics

  • The small discs appear frosted; spores one-septate and doubly constricted
  • Only confused with A. analepta which lacks the disc frosting and doubly constricted spores and has larger discs.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Arthopyrenia cinereopruinosa (Schaer.) A.Massal.. [In] LichenIreland. Accessed on 2019-01-20.