Abstract
A new species,
Rhexoxylon piatnitzkyi
is described and illustrated. It is a small stem showing the primary organization of the vascular cylinder and has enabled the authors to present a new interpretation of the development of the complex mature stem structure of
Rhexoxylon
. Together with further specimens of larger stems described provisionally as
Rhexoxylon
sp.A the material has revealed new anatomical details. The diagnosis of
Rhexoxylon
and of
R. tetrapteridoides
Walton are emended.
R. waltonii
Kräusel is reduced to a synonym of
R. africanum
Bancroft.
R. priestleyi
(Seward) Walton is restored to
Antartic-oxylon
Seward because of differences judged to be of generic value. The affinities of
Rhexoxylon
are discussed. The present record from Triassic strata in north-west Argentina is the first occurrence of
Rhexoxylon
outside Africa and supports a stratigraphical correlation of the beds (Ischigualasto Formation) with the Stormberg Series of South Africa.
Subject
Industrial and Manufacturing Engineering,General Agricultural and Biological Sciences,General Business, Management and Accounting,Materials Science (miscellaneous),Business and International Management
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