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Images of British Lichens

Mycomicrothelia confusa D.Hawksw.

Thallus thin, creamy white, sometimes delimited with a purplish-black margin, forming a lichen with the orange-coloured alga Trentepohlia but perhaps not always so; perithecia numerous, black, ± globose, covered by a shiny, dark brown to black involucrellum (see FAQ) that intermeshes with bark cells at its margin to form a minute fringe around the perithecium, pycnidia absent, ascospores brown when mature, 1-septate, constricted at the septum to produce two unequally sized cells. On smooth-barked trees, generally in shade, in humid and oceanic woodland in western Britain, a species of the 'Celtic Rainforest'.

Refs: Smith et al. (2009), 620; Purvis et al. (1992), 394; Orange (2013).

Mycomicrothelia confusa
Mycomicrothelia confusa
On Rowan (Sorbus aucuparia) bark, with some free Trentepohlia (orange alga) on the thallus surface, Ardilistry, Islay, May 2011 (BLS meeting)

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Uploaded March 2014