• Calicium viride Pers.
Calicium viride
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One of the largest of the ‘pin-head lichen’ tribe, C. viride is known by its thick, bright green, scurfy-granular thallus. The discs (heads – in Calicium speak) sit at the end of black stalks (pins). These can be up to 2mm high with a distinct brown, lower-surface colouring. It grows on the dry, acid bark of trees in woodland, oak especially. It is pollution tolerant. Frequent in the east of Ireland.

Key characteristics

  • Tall pins to 2mm high, heads brown below
  • Thallus bright-green, granular.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Calicium viride Pers.. [In] LichenIreland. Accessed on 2018-07-19.