In this article we will discuss about:- 1. History of Heterospory 2. Incipience of Heterospory 3. Origin 4. Evidences 5. Advantages. History of Heterospory: Pteridophytes are the first true land plants. Being the first successful colonisers in land habit pteridophytes show both the homospory and heterospory. Most of the pteridophytes are homosporous, produce isospores which are morphologically and physiologically identical. [...]
In this article we will discuss about the structure and reproduction in Dryopteris. Structure of Dryopteris: Sporophyte: The sporophytic plant body is differentiated into roots, rhizomatous stem and leaves (Fig. 7.111 A). 1. Root: The primary root is ephemeral, and is replaced by a large number of adventitious roots growing from the leaf bases. The roots are small and branched. [...]
In this article we will discuss about the structure and reproduction in Pteris. Structure of Pteris: Sporophyte: The main sporophytic plant body is differentiated into root, rhizomatous stem and leaves (Fig. 7.102A). 1. Root: The primary root is ephemeral, and is replaced by a large number of adventitious roots developed all over the surface of the rhizome. The roots are [...]