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Hugonnot V.,Conservatoire Botanique National du Massif Central
Flora Mediterranea | Year: 2014

The bryoflora of the Gorges de l'Ardèche has been bryoflostically investigated. The previously published records, corresponding to 27 taxa, have been taken into account. Today, 216 bryophyte taxa are confidently recorded in the Gorges de l'Ardèche site. It is considered as a local hot-spot of bryological diversity in a south-eastern France context. Several genera are of special ecological interest: Didymodon, Orthotrichum, Bryum, Fissidens and Riccia. More than 20 remarkable species are additionally recorded: Acaulon triquetrum, Aleniella besseri, Barbula bolleana, Bryum canariense, Cheilothela chloropus, Cinclidotus danubicus, Didymodon nicholsonii, Ephemerum recurvifolium, Fissidens fontanus, Grimmia tergestina, Homalia lusitanica, Homalothecium aureum, Mannia californica, Marchantia paleacea, Orthotrichum philibertii, Orthotrichum sprucei, R. trabutiana, Radula lindenbergiana, Riccia cavernosa, Scorpiurium sendtneri, Timmiella anomala and Tortella inflexa. A significant number of species is largely dependant upon the natural functioning of the Ardèche river, with an intense alluvial activity and remodelling of river banks. Most forest stands are young ones, originating from forest recolonization of ancient pastoral areas. The conservation of the bryophyte communities is very simple and shall be based upon the principle of minimum intervention. An improvement of the waste water disposal systems of many campsites is needed.

Hugonnot V.,Conservatoire Botanique National du Massif Central | Chavoutier L.,Les Hesperides
Cryptogamie, Bryologie | Year: 2015

Aloina bifrons (De Not.) Delgad. is recorded for the first time in France in the Limagne, Puy-de-Dôme department, Auvergne region. This is a significant northward extension of the species' known range. It grows there on sunny marlaceous lime with gypsum traces on a south-facing steep slope. The French habitat differs significantly from the situation recorded in other parts of the Mediterranean and Irano-Turanic areas, where Aloina bifrons is a typical inhabitant of gypsum soils with a rich assemblage of Xeropottioid elements. © 2015 Adac. Tous droits réservés.

Philippe M.,9 boulevard Joffre | Hugonnot V.,Conservatoire Botanique National du Massif Central
Bulletin Mensuel de la Societe Linneenne de Lyon | Year: 2016

Two moss species are reported for the first time for the Ain department, north-eastern France, Seligeria patula (Lindb.) Lindb. and Seligeria carniolica (Breidl. & Beck) Nyholm. The latter, a European endemic moss, rare at continental scale, was represented by what might be the largest known population. Both species having been observed on marly limestone, the peculiarities of this substrate are briefly discussed.

Hugonnot V.,Conservatoire Botanique National du Massif Central | Celle J.,Conservatoire Botanique National du Massif Central
Nova Hedwigia | Year: 2015

Helodium blandowii is reported as new to France in the oriental part of the Pyrenean range and the Massif Central. The plant communities are described and associated bryophytes are listed. Issues relating to conservation are discussed. © 2015 J. Cramer in Gebr. Borntraeger Verlagsbuchhandlung, Stuttgart, Germany.

Hugonnot V.,Conservatoire Botanique National du Massif Central | Hedenas L.,Swedish Museum of Natural History
Journal of Bryology | Year: 2015

Arvernella microclada Hugonnot & Hedenäs is described from several localities in the Massif Central of France (Auvergne). This diminutive, autoicous, pleurocarpous moss has strongly prorate distal ends of the leaf lamina cells and straight and erect inner perichaetial leaves. It bears a superficial resemblance to small Heterocladium Bruch & Schimp. species, especially H. flaccidum (Schimp.) A.J.E.Sm. or weak phenotypes of H. wulfsbergii I.Hagen. Other small confervoid species, like Platydictya jungermannioides (Brid.) H.A.Crum or Serpoleskea confervoides (Brid.) Loeske differ in several respects, most notably in the absence of abaxial leaf lamina cell prorations, but also in rhizoid topography (Platydictya) and leaf orientation and leaf margin denticulation (Serpoleskea). Arvernella microclada grows in subalpine tall-herb communities and Fagus sylvatica L. mountain woods on small lava blocks on cold, unstable, and steep scree slopes. The restricted known geographical distribution may be of conservation concern. © British Bryological Society 2015.

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