LA FLORA TRIÁSICA DEL GRUPO EL TRANQUILO, PROVINCIA DE SANTA CRUZ (PATAGONIA). PARTE IV. PTERIDOSPERMAE

Silvia Gnaedinger, Rafael Herbst

Abstract


The pteridosperms of the El Tranquilo Group (Upper Triassic of Patagonia) are studied. Well known and widespread Gondwana species are only mentioned while less known taxa are described. The list of species comprises: Dicroidium crassum (Menéndez) Petriella, D. dubium (Feistmante) Gothan, D. lancifolium (Morris) Gothan, D. odontopteroides (Morris) Gothan, D. townrovii Retallack, Dicroidium sp. 1, Dicroidium sp. 2; Diplasiophyllum hughesi (Feistmantel) Frenguelli, Xylopteris argentina (Kurtz) Frenguelli, X. rigida (Dun) Jain y Delevoryas, X. spinifolia (Tenison-Woods) Frenguelli, Zuberia zuberi (Szajnocha) Frenguelli, Lepidopteris madagascariensis (Carpentier) Townrow, L. stormbergensis (Seward) Townrow; Scytophyllum neuburgianum Dobruskina. The taxonomic rank ofvariety in this group ofplants is not accepted as it can be shown that most ofthem are transitional forms within species polymorphism.

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