• Staurothele hymenogonia (Nyl.) Th.Fr.
Staurothele hymenogonia
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This is a lichen of scattered limestone fragments and pebbles. Although the thallus is hidden below the surface (endolithic), the spherical discs (perithecia), which are strengthened by a black, thickened outer shell called an involucrellum, are only shallowly immersed in pits in the rock, so can easily be seen as cone-like projections. Spores are colourless, 2529m and eight-spored in the ascus. The algal cells present in the discs are ellipsoid and therefore, longer (37.5m) than in S. caesia. In Ireland, the species is rare.

Key characteristics

  • Thallus endolithic; discs not deeply immersed in pits, disc with involucrellum
  • Spores eight/ascus, colourless; ellipsoid, shaped like elongated bricks.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Staurothele hymenogonia (Nyl.) Th.Fr.. [In] LichenIreland. Accessed on 2018-08-16.