• Megalospora tuberculosa (Fée) Sipman
Megalospora tuberculosa
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Often confused in the past with Megalaria pulverea, M. tuberculosa has a thick, soft, pale green or grey finely granular thallus disintegrating to form yellow-grey or blue-grey soralia. Spot tests K+ pale yellow, Pd-. Discs are unknown from Irish material. Most lookalike species test Pd+ red. It grows on oak and ash, especially in sheltered, long-established, well-illuminated woodland sites.

Key characteristics

  • Thallus thick, soft, finely green-grey granular, eroding to form soralia blue-grey or yellow-grey in colour
  • Forming distinct patches; K+ pale yellow, Pd-.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Megalospora tuberculosa (Fée) Sipman. [In] LichenIreland. Accessed on 2018-08-16.