• Parmotrema reticulatum (Taylor) M.Choisy
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Parmotrema reticulatum
© Robert Thompson
Parmotrema reticulatum
© Robert Thompson
Parmotrema reticulatum
© Mike Simms
Parmotrema reticulatum
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On first sight this large foliose lichen is not dissimilar to Parmotrema perlatum (described elsewhere). However, in P. reticulatum the lobes will be seen to be minutely cracked to form a net of tiny lines across the surface of the cortex. Some lobes are more intricately netted than others. A dusting of soredia is usually present on the ends of the turned-down lobe tips. The medulla (layer below the outer cortex), if exposed, should react K + yellow to red, Pd-. This species is frequent in Ireland, especially on isolated and wayside trees in the low-lying coastal areas and along the principal river valleys further inland.

Key characteristics

  • It is very similar to Parmotrema perlatum from which it is readily separated by the many distinctive hairline cracks that cross its surface
  • The medulla of P. perlatum reacts K + yellowy-orange only; Pd + orange.

Original text submitted by Simon Davey

 Simms, M. J., (2016). Parmotrema reticulatum (Taylor) M.Choisy. [In] LichenIreland. Accessed on 2018-07-16.