In this article we will discuss about the affinities of ginkgo which belong to the family of class ginkgopsida. A. Relation to Ferns: The similarities between Ginkgo and ferns are: i. The leaves of Ginkgo shows striking similarity with Adiantum (maiden hair fern) in form, shape and venation and hence the name maiden hair tree for Ginkgo tree. ii. The [...]
In this article we will discuss about the affinities of Cycadeoids which belong to the family of Class Cycadopsida. A. Relation to Ferns: Cycadeoids resemble ferns in the following characteristics: 1. The abundance of multicellular rementa on the plant body. 2. The presence of scalariform tracheids, large pith and direct leaf traces. 3. The pinnatified microsporophyll with lateral rows of [...]
In this article we will discuss about the common parts of callistophyton plants. Stem: T.S. of Callistophyton stem shows a central angular parenchymatous pith surrounded by eustele. The stele is composed of a ring of 5 to 13 axial bundles (sympodia) forming leaf traces in 2/5 arrangement. Both mesarch and exarch primary bundles are reported, which are surrounded by thick [...]