In this article we will discuss about the structure and reproduction in Isoetes with the help of diagrams. Structure of Isoetes: Sporophyte: The plant resembles a monocot garlic plant in particular (Fig. 7.59). Isoetes is commonly called 'Quill wort' due to the quill (a large feather)-like structure of the leaves. The plant body consists of a condensed, lobed corm or [...]
In this article we will discuss about the structure of Lycopodium with the help of diagrams. The main plant body is sporophytic. It consists of slender and branched stem, numerous small leaves (microphylls) and dichotomously- branched roots (Fig. 7.23A, B). Roots: The primary root or first formed root of the young sporophyte is ephemeral, short-lived. The older plants have dichotomously [...]
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. [...]