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Leptogium gelatinosum (With.) J.R.Laundon


Thallus variable, gelatinous, papery when dry, lobes reddish to dark brown, smooth to irregularly wrinckled, lacking isidia, margin smooth to uneven or somewhat ragged, not fimbriate; apothecia frequent, smooth, coloured as the lobes or somewhat more orange on darker lobes. Widespread and locally frequent amongst mosses on rocks, walls, soil and sometimes tree-bases, in calcareous situations.

Refs: Smith et al. (2009), 546; Purvis et al. (1992), 354 (in major part); Dobson (2011), 254 (photo only); Whelan (2011), 109 (in major part) (photo); Nordic Lichen Flora (2007) 3: 35, 185 (photo); van Herk & Aptroot (2004, 2013), 238-9 (photo); Aptroot et al. (2011), 130 (photos); Wirth (1995), 2: 548-9 (photo); Wirth, Hauck & Schulz (2013), 2: 690, 694 (photo); Holien & Tønsberg (2008), 130 (photo); Arup et al. (1997), 184 (photo); Valcárcel et al. (2003), 236-7 (photo); Brodo et al. (2001), 405 (photo).

The similar lichen with fimbriate lobe-margins, previously confused with L. lichenoides, is now separated as L. pulvinatum.

 
Leptogium gelatinosum
Leptogium gelatinosum, close-up
Thallus lobes with more or less entire margins, Kindrogan, Perthshire, March 2008
 
Leptogium gelatinosum with apothecia, close-up
Close-up of thallus with apothecia, Glen Tilt, Perthshire, April 2008


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Uploaded September 2008, last updated January 2014