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Images of British Lichens

Xanthoria ulophyllodes Räsänen

Description, based on tabulated characters in Kondratyuk (1997):
Foliose, orange (but evidently brighter yellow when wet), lobes spreading, very narrow, typically to 0.5mm in width (–1.5mm), tips budding rounded blastidia, 20–30 µm in diameter (microscope), some agglomerated into larger 'conblastidia', 40-60 µm diameter, rhizines present; apothecia laminal, spermatia (in orange, laminar pycnidia) narrowly cylindrical (bacilliform). Apparently uncommon and perhaps more in eastern Britain, on nutrient-enriched bark. Can be confused with Candelaria concolor but the latter does not test crimson-red with KOH.

Refs: Kondratyuk (1997); Smith et al. (2009), 971; Purvis et al. (1992), 646; Dobson (2005), 462; Dobson (2011), 472; Wirth (1995), 2: 973; Brodo et al. (2001), 748 (photo); Walewski (2007), 131 (photo, as X. "ulypholodes").

Xanthoria ulophyllodes
Xanthoria ulophyllodes, showing purple reaction with KOH
On Sycamore (Acer pseudoplatanus), Kindrogan, Perthshire, March 2008, wet material on morning after heavy dew.
Lower photograph shows positive (crimson) reaction with potassium hydroxide.

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© A.J. Silverside
Uploaded August 2008, last updated December 2011