Polysporia doubingeri n.sp., un nouvel organe reproducteur de lycophyte du Stéphanien (Carbonifère supérieur) de Blanzy-Montceau (Massif Central, France) / Polysporia doubingeri n.sp., a new lycopod reproductive organ from the Stephanian (Upper Carboniferous) of Blanzy-Montceau (Massif Central, France)

In the rich macroflora from the Stephanian of the Blanzy-Montceau basin (Massif Central, France), several very large, heterosporous lycopod cones have been found whose microspores and megaspores correspond, respectively, to the well known sporne dispersae genera Endosporites Wilson & Сое and Valvisisporites (Ibrahim) Potonié & Kremp. The structure of these cones and the type of their spores, both micro-and megaspores, led us to assign these new fructifications to the genus Polysporia newberry and to create the new species, P. doubingeri. The combination Endosporites-Valvisisporites also proved to characterize other lycopods among which Chaloneria Pigg & Rothwell from the Pennsylvanian of North America which has been classified into the Chaloneriaceae within the Isoetales. However P. doubingeri n.sp. seems to differ very much from the fertile organs of C. cormosa and C. periodica which are only known as permineralized ones. Thus one can wonder whether the single similarity in the micro- and megaspores produced by these three species is enough to justify the assignment of P. doubingeri n.sp. in the Chaloneriaceae. However a large variety in growth habit seemed to characterize the plant genera which are included in this family.Dans l'abondante macroflore du Stéphanien du bassin houiller de Blanzy-Montceau (Massif Central, France) ont été trouvés plusieurs très grands cônes hétérosporés de lycophyte dont les microspores et les mégaspores correspondent, respectivement, aux genres Endosporites Wilson & Сое et Valvisisporites (Ibrahim) Potonié & Kremp. La structure de ces cônes et la nature de leurs spores nous ont conduit à les attribuer au genre Polysporia newberry et à créer la nouvelle espèce, P. doubingeri. L'association Endosporites-Valvisisporites existe aussi chez d'autres lycophytes, parmi lesquelles le genre Chaloneria Pigg & Rothwell du Pennsylvanien d'Amérique du Nord qui a été classé dans la famille des Chaloneriaceae (Isoétales). P. doubingeri n.sp. semble cependant très différent des fructifications de C. cormosa et C. periodica qui sont connues uniquement en structure. Aussi peut-on se demander si la seule similarité des microspores et des mégaspores produites par ces trois espèces peut suffire à justifier l'attribution de P. doubingeri n.sp. à la famille des Chaloneriaceae. Une grande variété d'aspect semblait caractériser les genres de plantes inclus dans cette famille.Grauvogel-Stamm Léa, Langiaux Jean. Polysporia doubingeri n.sp., un nouvel organe reproducteur de lycophyte du Stéphanien (Carbonifère supérieur) de Blanzy-Montceau (Massif Central, France) / Polysporia doubingeri n.sp., a new lycopod reproductive organ from the Stephanian (Upper Carboniferous) of Blanzy-Montceau (Massif Central, France). In: Sciences Géologiques. Bulletin, tome 48, n°1-3, 1995. Paléobotanique et palynologie du Permo-Carbonifère et du Trias / Palaeobotany and Palynology of the Permo-Carboniferous and the Triassic sous la direction de Raymond Rauscher . pp. 63-81

La flore fossile du bassin houiller de Saint-\uc9tienne

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First occurrence of the lungfish Sagenodus (Dipnoi, Sarcopterygii) from the Carboniferous Lagerstätte of Montceau-les-Mines, France

New material of the dipnoan genus Sagenodus is described from the Carboniferous of the Barrat quarry (Blanzy-Creuzot coal basin, Montceau-les-Mines, France). This is the first occurrence of this lungfish in France, which enlarges its distribution within Europe (Fritsch, 1888; Schultze, 1993; Watson and Gill, 1923). This material is Stephanian B in age, the previously established geological range of this Euramerican (Schultze and Chorn, 1997) genus. Remains consist of skull, lower jaw and shoulder girdle elements, closely set together with many ribs. This material, considered as belonging to a single disarticulated specimen, presents affinities with the material of Sagenodus sp. from Germany (Schultze, 1993) and appears significantly different to all other known Sagenodus species. However this new material can only be attributed to Sagenodus sp. because of its incompleteness. Montceau-les-Mines is interpreted as a freshwater environment deposit and the presence of Sagenodus in this locality confirms that most of the localities of Sagenodus are freshwater deposits. The strong affinities, existing between the material from France and Germany, indicate that there were solid hydrographic links between both basins during the Stephanian B–Upper Rotliegend period