On the Permian permineralized woods of the "Fossil Flora of the Coal Measures of Brazil" (D. White, 1908): taxonomic re-evaluation

Abstract

White published, in 1908, the “Report on the Fossil Flora of the Coal Measures of Brazil”, an important work that became a reference for the study of fossil plants collected mainly from Early Permian sediments of the Paraná Basin. In this work, the author described for the first time a large number of plant fossils collected in the states of Santa Catarina and Rio Grande do Sul, including a few pieces of permineralized wood. This paper presents the first taxonomic reevaluation of the permineralized woods described by D. White, using the samples on which he based his descriptions. Sigillaria (?) muralis White is transferred to the genus Scalaroxylon, due to presence of scalariform pitting on the radial walls of the tracheids, thus forming a new combination Scalaroxylon muralis (White); Araucarioxylon nummularium (White) Maheshwari is transferred to the genus Brachyoxylon, because of the araucarioid character of its radial- wall pits and cross- fields, thus forming a new combination Brachyoxylon nummularium (White); Araucarioxylon meridionale (White) Maheshwari is considered as an dubios taxon due to non- preservation of its cross- field pits. The re-evaluation of the fossils described by White enabled a better understanding of the botanical affinities of the Glossopteris flora from southern Brazil. For the first time, the genus Scaraloxylon is recorded in the Permian; until now it had only been found in the Triassic and Cretaceous of Gondwana.