• Verrucaria macrostoma forma furfuracea de Lesd.
Verrucaria macrostoma  forma furfuracea
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This form has all the features of V. macrostoma (described elsewhere) but differs in the absence of spherical discs (perithecia), and in the presence of sorediate or isidia-like structures (blastidia) growing along the edges of the areoles (cracked pieces of the thallus).

Key characteristics

  • Thallus immersed, discs and dots (pycnidia) visible at the surface, speckled with fragments of grey or brown from below
  • Discs with distinct sunken apex; hard limestone.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Verrucaria macrostoma forma furfuracea de Lesd.. [In] LichenIreland. Accessed on 2018-08-14.