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Plantae |
Department of Botany, Imperial College of Science and Technology, Prince Consort Road, London S W 7
Department of Botany, The University, Reading, Berkshire
Department of Botany, The University, Reading, Berkshire
Department of Geology, Sedgwick Museum, Downing Street, Cambridge
Geology Department, The University, St. George’s Square, Sheffield 1
Department of Botany, The University, Leeds 2
The classification of this division is still evolving from the traditional framework of extant higher taxa to one in which the many extinctions of the Mesozoic will be made clear by groupings based on the fossils alone. New discoveries have made the relationships of Upper Palaeozoic families both more interesting and much less certain; the order of their arrangement here is therefore of necessity arbitrary. Some fossils from some of the new groups of the Angara flora (Permian) are little known as yet and their inclusion has not been attempted. No attmept has been made to keep the level of taxa recorded consistent throughout this chapter.
Gymnosperm family names have been under consideration by the Section of Nomenclature of the Tenth International Botanical Congress (1964), and a provisional list with authorities and dates for the extant families has been published by (BUCHHEIM, G. 1966. Nomina Familiarum Conservanda Proposita: Gymnospermae. Taxon, 15, 219–220). [N.F.H.]
Class PROGYMNOSPERMOPSIDA Beck 1960
First, Dev Givet: Aneurophyton germanicum, Honseler-schichten, Elbefeld, Germany (Kräusel & Weyland 1929); also A. hallei and Eospermatopteris, New York.
Last, Carb Tourn: Callixylon arnoldii, Falling Run member, Sanderson Fm, New Albany Sh, Kentucky. (Beck 1962).
Constituent orders: Aneurophytales Beck, Givet-Frasn; Callixylales (Archaeopteris, Callixylon), Frasn-Tourn; Protopityales Nemejc, Tourn. [P.D.W.B.]
Comment: The Order Archaeopteridales is recorded separately below.
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This 250-word extract was created in the absence of an abstract.
