LichenIreland
  • Polyblastia albida Arnold
Polyblastia albida
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Like some members of Verrucaria, for example, V. baldensis, this species forms ‘burrows’ or pits in limestone. The lichen hunter is compelled to dig them out with the edge of a razor blade and squash the contents between a cover slip placed on a microscope slide. The thallus is barely visible as a stain. The spherical discs (perithecia) immersed in the rock have their tops freed from the side of the pit by a narrow crack (hand lens). The disc is not reinforced above by a thick outer layer (involucrellum). The spores are muriform and colourless 25-50 x 12-25ųm, 8/ascus). On hard, well-lit limestone, or damp walls. Northern and western Ireland.

Key characteristics

  • Dots the surface of hard limestone with pits so must be dug out
  • Spores muriform, with 10-36 cells present.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Polyblastia albida Arnold. [In] LichenIreland.
http://www.habitas.org.uk/lichenireland/species.asp?item=20617 Accessed on 2017-12-13.