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Images of British Lichens

Phaeocalicium populneum (Brond. ex Duby) A.F.W. Schmidt

A 'pin' lichen, with tiny, black, stalked, ± globose apothecia less than 1 mm in height, differing from many other pin lichens by not breaking down to a powdery mass of spores, thallus not visible, immersed in the substrate surface; ascospores 1-septate, with dark, smooth walls. Very local and scarce on old twigs and branches of Poplar (Populus) species.

Refs: Smith et al. (2009), 690; Purvis et al. (1992), 460; Wirth, Hauck & Schulz (2013), 2: 857 (photo); Nordic Lichen Flora (1999) 1: 60, 89 (photo); Thor & Arvidsson (1999), 303 (photo), 411.

Phaeocalicium populneum
Phaeocalicium populneum
On Balsam Poplar hybrid, probably P. x jackii, Kindrogan, Perthshire, April 2008. (Note that the yellow thallus is Xanthoria.)

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Uploaded September 2010, last updated September 2013