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Pannaria rubiginosa (Thunb.) Bory


Thallus foliose, to squamulose in the centre, with small, brown to blue-grey, often imbricate (overlapping) lobes, margins thicker and paler, lacking granules and often with a blue-black fibrous hypothallus extending from the underside; commonly fertile, apothecia with red-brown discs and whitish, crenulate margins. On mossy, nutrient-rich bark, commonly with Lobaria and Degelia species, in sheltered, humid, old woodland in the north and west, now largely confined to western Scotland.

Refs: Smith et al. (2009), 651; Purvis et al. (1992), 421; Dobson (2005), 297-8 (photo); Dobson (2011), 300 (photo); Jahns (1983), 232-3 (photo); Whelan (2011), 120 (photo); Nordic Lichen Flora (2007) 3: 106, 191 (photo); Holien & Tønsberg (2008), 109 (photo); Arup et al. (1997), 228 (photo); Thor & Arvidsson (1999), 297 (photo), 393; Valcárcel et al. (2003), 264-5 (photo); Valcárcel et al. (2003), 264-5 (photo); Hinds & Hinds (2007), 333-4 (photo); Brodo et al. (2001), 478 (photo); McCune & Geiser (2009), 219 (photo); Lichen Atlas of the British Isles 4: 980 (1999).

Can be confused with Degelia plumbea, which has a similar, fringing hypothallus, but is larger and has apothecia that have pale 'proper' margins, not truly thalline, and also with Protopannaria pezizoides, which has very similar apothecia and appearance, especially when wet, but a thallus of small squamules.

Pannaria rubiginosa
Pannaria rubiginosa, enlarged view
On mossy branch of Sycamore (Acer pseudoplatanus), Isle of Muck (BLS meeting), June 2012
 
Pannaria rubiginosa (wet)
Wet material on mossy branch of Hazel (Corylus avellana), Logie Woods, Morayshire (BLS meeting), August 2010
 
Pannaria rubiginosa
Rather dry material on Ash (Fraxinus excelsior) trunk, Ballygrant, Islay (BLS meeting), May 2011


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