Jamesoniella undulifolia (Nees) K. Muell. Status: Vulnerable (VU) A1ac ———————————————————————————————————————— Class: Hepaticae Order: Family:

Description and Biology: This reddish brown-tinged and medium-sized leafy hepatic is forming mats or scattered are intermixed with other bryophytes. The rounded leaves are entire and obliquely inserted on the stem. J. undulifolia is likely to be confused with J. autumnalis but is it is distinct in habitat, has larger undula te leaves with larger cells and has smaller teeths at the perianth mouth. The is very rarely fertile.

Distribution and Habitat: This species has a temperate to arctic distribution and is confined to Europe, , eastern Canada and Russian part of Asia. In Europe it has an apparent western distribution but is absent from the Mediterranean region. It reaches East to northern Bohemia, South to and North to Scandinavia. It has also recently been found in North . J. undulifolia grows among and over Sphagnum in mires, where it seems to prefer more or less level ground. Most sites are in minerotrophic mires, but the species may also occur in ombrotrophic bogs. In Russia and Greenland it seems to be associated with e.g. Lophozia binsteadii and Sphagnum spp.

History and Outlook: J. undulifolia has decreased dramatically in many countries. In Great Britain recently 3 new localities have been discovered, one in Cornwall (bringing total in Cornwall to 3), a small population in Shropshire and small population in Cumbria. This means that there are 6 extant localities in Britain, with the Argyll site in Scotland holding the strongest population. Also in France new localities have been found. In Bohemia () four localities are known but not found after 1907 and here probably extinct (Vana, pers. comm.). In it has been recorded from eight sites but remains on none of these. The situation is similar in and . The main threats are drainage and other habitat damages, including burning at one site. One of the British sites was lost due to the creation of a reservoir, and two other sites have been lost due to conifer planting or to deterioration of the habitat such as eutrophication and poaching. All remaining sites need protection from habitat damage, and should be notified.

References: Grolle, R. 1971. und Verwandte. Feddes Repertorium 82: 1--99.Berlin. Schuster, R.M. & Konstantinova, N.A. 1996. Studies on the distribution of critical arctic/subarctic Hepaticae with special reference to taxa found in Russia. Lindbergia 21: 26--48. Schuster, R.M. The Hepaticae of South Greenland. Beiheft zur Nova Hedwigia Hft 92. J. Cramer. Berlin-Stuttgart. Sofronova, 2000. Arctoa 9: 13--20. Szweykowski, J. 1971. H. 156, Jamesoniella undulifolia in: Atlas of geographical distribution of spore-plants in . (eds. J. Szweykowski and T. Wojterski). Poznan. MAP.

Red data sheet authors : Tomas Hallingbäck, Swedish University of Agricultural Sciences, Threatened Species Unit, P O Box 7007, SE-75007 Uppsala, SWEDEN. ———————————————————————————————————————— Last updated: January 2005