In this article we will discuss about the origin of seed in selaginella. An evolutionary sequence of origin of seed from homosporous form should involve: (a) Production of two kinds of spores, (b) Reduction in the number of functional megaspores, (c) Final reduction to a single megaspore in the sporangium, (d) Retention of megaspore within […]
Origin of Seed in Selaginella | Pteridophytes | Botany
Article shared by : 
Reproduction in Selaginella (With Diagram) | Pteridophytes | Botany
Article shared by :
In this article we will discuss about the process of reproduction in selaginella with the help of diagram. Selaginella is heterosporous. Two types of sporangia (larger ones megasporangia and smaller ones microsporangia) containing larger and smaller spores are borne on sporophylls which form cones terminally either on the stem or branches. The cones are inconspicuous […]
Reproduction in Equisetum (With Diagram) | Pteridophytes | Botany
Article shared by :
In this article we will discuss about the process of reproduction in equisetum with the help of diagrams. The cones (Fig. 9.3A) are terminal either on the main shoot as in E. arvense (Fig. 9.1 A, B), or on smaller lateral branches as in E. heymale. At the base of cone is a ring-like structure, […]