• Japewiella tavaresiana (H.Magn.) Printzen
Japewiella tavaresiana
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(Map updated: 11 August 2009)

This not uncommon, crustose epiphyte has a rather distinctive habitat: the small twig and branch nodes of willow trees in sallow swamp or ‘carr’. While it also grows on other hosts, sallow is the host to target. This species has a thin, whitish, generally insignificant thallus with a prominent cluster of reddish-brown to dark brown, almost black, discs (0.2-0.5mm diam.). It is scattered in Ireland but is more frequent around the loughs of the north and west.

Key characteristics

  • The habitat and clustered, dark brown to almost black fruits on twigs, often associated with Lecanora jamesii serve to suggest this species
  • It can be confirmed with certainty by microscopic analysis: spores simple, ellipsoid, thick-walled (17 x 9 µm).

Original text submitted by Simon Davey

 Simms, M. J., (2016). Japewiella tavaresiana (H.Magn.) Printzen. [In] LichenIreland. Accessed on 2020-07-06.