Question

anatomical peculiarities of cordaitean stem​

Answer 1

Answer:

The internal structure of stem in cordaites showed a combination of cycas and conifers characters. Pith, like cycads layer but discoid in form, it was in form of plates at intervats.

Explanation:

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Answer 2

Systematic position of Cordaitales:

Division. Gymnospermae

Class. Coniferopsida

Order. Cordaitales

Family. Cordaitaceae

Genus. Cordaites.

Introduction to Cordaitales:

• The Cordaitales is every other fossil organization which lived aspect via side with the Cycadofilicales in Palaeozoic instances. Both the corporations were very common, the Cordaitales being then the winning gymnospermous wooded area plant life.

• The group extends from Devonian thru Carboniferous upto the Permian instances, and in India they were located even within the lower Mesozoic, i.E., in Lower Gondwana strata of India. The vegetation of this institution have been bushes a few even greater than 90 ft in peak and 3 ft in diameter.

• The plant branched at only tips and bore normally slim and simple leaves in clusters at pinnacle.

According to Scott, the order can be divided into 3 organizations:

1. Poroxyleae.

2. Pityeae and

3. Cordaiteae.