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. [...]
In this article we will discuss about the classification of ophioglosside:- 1. Genus Ophioglossum of Ophioglosside 2. Sporophyte of Ophioglosside 3. Gametophytic Generation 4. New Sporophyte 5. Genus Botrychium 6. Genus Helminthostachys. Genus Ophioglossum of Ophioglosside: Ophioglossum (sometimes called 'Adder's Tongue') is taken up first as it is the commonest, although it is possibly more advanced (mainly by reduction) than [...]
The Protoleptosporangidae or the Osmundidae comprising of the single order Osmundales with the single family Osmundaceae is taken out of the Leptosporangiates as proposed by Hirmer (1927) as it is not truly leptosporangiate. The Osmundales is a very ancient order represented by Thamnopteris and Zalesskya from late Permian and by Osmundites itself from Jurassic onwards. The climax of the group [...]