Autun Basin Research Articles

Problems of cuticular analysis of pteridosperms

Some effects of preparation and examination methods and their implications for the interpretation of pteridosperm leaf cuticles are discussed on the basis of three examples of well-known taxa whose cuticles have often been misinterpreted, i.e. Autunia (al. Callipteris) conferta from the European Rotliegend (Lower Permian), Alethopteris zeilleri from the Stephanian B of the Autun Basin, and Karinopteris sp. from the Indiana Paper Shale (Pennsylvanian). Autunia confera has long been regarded as hypostomatic but it appears to be amphistomatic and the cuticles of the lower leaf surface have been confused with those of the upper leaf surface. The cuticles of the lower leaf surface of Alethopteris zeilleri, which are often lost during maceration, are described in detail. The cuticles of the lower leaf surface of Karinopteris sp. are described for the first time. This plant had hypostomatic leaves. The structures of the cuticles of the upper leaf surface and the axes, interpreted as stomata by some previous authors, appear to be hair bases. The new data on features which have previously been overlooked or misinterpreted can be essential for taxonomic and/or palaeoecological interpretations.

Sur une particularite anatomique de certains poissons du Permo-Carbonifere des bassins de Commentry et Autun

Abstract Paramblypterus decorus, a fossil fish occurring abundantly in the Stephanian (upper Carboniferous) of the Commentry basin near Montlucon in central France, differs from most palaeoniscids in having no teeth on the maxillary and the mandible. Instead, these are separated by a striated zone (five to six millimeters in a fish 30 centimeters long) bearing a line of extraordinarily small teeth each at the end of a small tube-like structure. These structures are known also in Aeduella, a genus of the middle Autunian (lower Permian). Specimens from the Autunian of the Autun basin northeast of the Commentry basin resemble those from Commentry, but their state of preservation does not permit more than tentative referral to P. decorus. These two probably identical forms from neighboring basins indicate no important stratigraphic break between the Stephanian and the Autunian in central France. Further investigation of the palaeoniscids is required to evaluate the relationship between P. decorus and the genus Aeduella, and to learn whether this unusual structure of the buccal region appeared before the Stephanian.

Structure of Pennsylvanian Plants from Illinois. I

Previous articleNext article FreeStructure of Pennsylvanian Plants from Illinois. IJ. Hobart HoskinsJ. Hobart Hoskins Search for more articles by this author PDFPDF PLUS Add to favoritesDownload CitationTrack CitationsPermissionsReprints Share onFacebookTwitterLinkedInRedditEmail SectionsMoreDetailsFiguresReferencesCited by Volume 82, Number 4Dec., 1926 Article DOIhttps://doi.org/10.1086/333677 Views: 7Total views on this site Citations: 5Citations are reported from Crossref Journal History This article was published in the Botanical Gazette (1876-1991), which is continued by International Journal of Plant Sciences (1992-present). PDF download Crossref reports the following articles citing this article:Jean Galtier, Ausonio Ronchi, Jean Broutin Early Permian silicified floras from the Perdasdefogu Basin (SE Sardinia): comparison and bio-chronostratigraphic correlation with the floras of the Autun Basin (Massif central, France), Geodiversitas 33, no.11 (Mar 2011): 43–69.https://doi.org/10.5252/g2011n1a4Jean Galtier Coal-ball floras of the Namurian-Westphalian of Europe, Review of Palaeobotany and Palynology 95, no.1-41-4 (Jan 1997): 51–72.https://doi.org/10.1016/S0034-6667(96)00027-9Henry N. Andrews American coal-ball floras, The Botanical Review 17, no.66 (Jun 1951): 431–469.https://doi.org/10.1007/BF02879039 Roy Graham Pennsylvanian Flora of Illinois as Revealed in Coal Balls. I, Botanical Gazette 95, no.33 (Sep 2015): 453–476.https://doi.org/10.1086/334401 Chester A. Arnold Cordaitean Wood from the Pennsylvanian of Michigan and Ohio, Botanical Gazette 91, no.11 (Oct 2015): 77–87.https://doi.org/10.1086/334127