In this article we will discuss about the resemblances of gymnosperms with pteridophytes and angiosperms. Resemblances of Gymnosperms with Pteridophytes: 1. Plant body is sporophytic, and the sporophyte is differentiated into roots, stem and leaves in both gymnosperms and pteridophytes. 2. Members of both the groups show a regular alternation of sporophytic and gametophytic generations. 3. Cercinate vernation of the [...]
The following points highlight the five important fossil genera which have strengthen the concept of Progymnospermopsida. The fossil genera are: 1. Archaeopteris 2. Aneurophyton 3. Rellimia 4. Tetraxylopteris 5. Protopitys. Progymnospermopsida: Fossil Genera # 1. Archaeopteris: The frond-genus Archaeopteris of Pityales is known by about fifteen species, all of which had large fern-like fronds (Fig. 3.1 A). Beck (1960) has [...]
In this article we will discuss about Lyginopteridaceae. After reading this article you will learn about: 1. Features of Lyginopteridaceae 2. Nomenclature of Lyginopteridaceae 3. External Features 4. Anatomy 5. Reproductive Organs 6. Some Other Genera. Contents: Features of Lyginopteridaceae Nomenclature of Lyginopteridaceae External Features of Lyginopteridaceae Anatomy of Lyginopteridaceae Reproductive Organs of Lyginopteridaceae Some Other Genera of Lyginopteridaceae 1. [...]