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Images of British Lichens

Protopannaria pezizoides (Weber) P.M.Jørg. & S.Ekman
(= Pannaria pezizoides (Weber) Trevis.)

Thallus a crust of minute, brown to grey squamules, grey-blue when wet; usually abundantly fertile, apothecia with orange-brown discs and conspicuous, whitish, granular margins, underside lacking hairs (compare Psoroma hypnorum). A local and generally upland species on peat, damp rocks and mossy trunks in the north and west.

Refs: Smith et al. (2009), 752; Purvis et al. (1992), 420 (as Pannaria); Dobson (2005), 365 (photo); Dobson (2011), 368-9 (photo); Jahns (1983), 232-3 (photo, as Pannaria); Whelan (2011), 135 (photo); Puntillo (1996), plate 28 (photo, as Pannaria); Wirth (1995), 2: 634, 635 (photo, as Pannaria); Wirth, Hauck & Schulz (2013), 2: 800, 932 (photo); Moberg & Holmåson (1984), 166 (photo, as Pannaria); Holien & Tønsberg (2008), 111 (photo); Nordic Lichen Flora (2007) 3: 109, 203 (photo); Hansen & Andersen (1995), 105 (photo, as Pannaria); Stenroos et al. (2011), 378 (photo); Brodo et al. (2001), 477-8 (photo, as Pannaria); Lichen Atlas of the British Isles 4: 979 (1999).

In addition to potential confusion with its close look-alike, Psoroma hypnorum, P. pezizoides is also closely resembled by Moelleropsis_nebulosa, which has a thallus of granules rather than minute, flattened squamules and generally smaller apothecia. Under wet, sodden conditions, confusion with Pannaria rubiginosa is also possible.

Protopannaria pezizoides
Protopannaria pezizoides, enlarged view
On degraded, montane peat, Glen Shee, Aberdeenshire, August 2008
Protopannaria pezizoides (wet)
Protopannaria pezizoides (wet)
Protopannaria pezizoides (colony on tree)
On Sycamore (Acer pseudoplatanus), Muirshiel, Renfrewshire, October 2010 (thalli wet)

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© A.J. Silverside
Uploaded January 2012, last updated September 2013