Cordaitales


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Cordaitales

[‚kȯr·dā‚ī′tā·lēz]
(paleobotany)
An extensive natural grouping of forest trees of the late Paleozoic.

Cordaitales

 

an order of extinct gymnosperms. The parts of the members of the order are described by the various type genera: the leaves, by Cordaites and Rufloria; the strobile clusters, by Cordaianthus; the seeds, by Cardiocarpus; the wood, by Dadoxylon and Araucarioxylon; and the impressions, by Artisia. The Cordaitales were large trees. Their wood typically had tightly grouped, sealed pores on the walls of the tracheids. The leaves were 20–50 cm and more in length and lanceolate, linear, or scapular in shape, with a parallel or flabellate vein system. The reproductive organs, which looked like catkins, bore strobiles. Each strobile contained scales in a tight spiral around the axis that gave way on the upper side to ovules in the female and groups of microsporangia in the male.

Cordaitales evolved from plants of the progymnosperm type, and it is possible that they in turn were the ancestors of the conifers. In the Carboniferous period and at the beginning of the Permian, the Cordaitales grew in tropical Euramerican areas, in the nontropical Angara, or Tungus, region, and in the Gondwara; in the later Permian they could be found in large numbers only in the Angara region. The leaves of Cordaitales are important in stratigraphy.

REFERENCES

Meien, S. V. Kordaitovye verkhnego paleozoyia Severnoi Evrazii. In Trudy Geologicheskogo in-ta AN SSSR, 1966, issue 150.
Florin, R. “Evolution in Cordaites and Conifers.” Acta Horti Bergiani, 1951, vol. 15, no. 11.

V. A. VAKHRAMEEV

References in periodicals archive ?
The female reproductive structures of the Cordaitales were borne in lax clusters of strobili.
Some follow this idea fairly strictly but view the Lebachiaceae as closely related to the Cordaitales though not derived from it.
Untersuchongen zur Stammesgeschichte der Coniferales und Cordaitales.