• Staurothele caesia (Arnold) Arnold
Staurothele caesia
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(Map updated: 11 August 2009)

This lichen produces its spherical discs (perithecia) in pits in hard limestone which therefore need to be dug out with the tip of a probe or razorblade before examining under the microscope. S. caesia has discs with eight-spored asci when fully developed. The spores are colourless, 3545m long. It is important to note the appearance of the algae within the disc which, in this species, are very slightly longer than they are wide; on well-lit limestone. In west Ireland mainly.

Key characteristics

  • Thallus endolithic (out of sight buried in the thallus); discs in deep pits
  • Discs with eight-spored asci and colourless spores; algae shaped like slightly elongated cubes or short bricks (35m); well-illuminated limestone.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Staurothele caesia (Arnold) Arnold. [In] LichenIreland. Accessed on 2019-05-21.