The following points highlight the four families under which marattidae has been classified. The families are:- 1. Angiopteridaceae 2. Marattiaceae 3. Christenseniaceae 4. Danaeaceae. Family # 1. Angiopteridaceae: Sporangia almost free, arranged in two rows on two sides of vein forming linear sori near margin. Genera: Angiopteris (100 spp. from Polynesia to Madagascar and the Himalayas), Archangiopteris (4 spp. from [...]
In this article we will discuss about the four orders under which primofilicidae has been classified. The orders are:- 1. Protopteridales 2. Coenopteridales 3. Cladoxylales 4. Archaeopteridales. Order # 1. Protopteridales: Protopteridium (Fig. 595A & B) from the Middle and Upper Devonian of Eastern Canada, Scotland, Belgium, Bohemia and China almost approaches the Psilophytales in simplicity with fern-like vegetative characters. [...]
The following points highlight the two orders under which confieropsida has been classified. The orders are:- 1. Ginkgoales 2. Czekanowskilaes. Order # 1. Ginkgoales: The Ginkgoales are included within the Coniferopsida because of its coniferous type tree, wood and gametophytes. But, its distinctiveness has given rise to the argument as to whether it should better be placed in a separate [...]