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
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Reproduction in Selaginella (With Diagram) | Pteridophytes | Botany
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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 […]
Anatomy of Marsilea (With Diagram) | Pteridophytes | Botany
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In this article we will discuss about the anatomy of marsilea with the help of diagrams. Occasionally, the same species may be found to grow in water as well as on land and consequently land form and water form are known to occur in the genus. Land and water forms can be easily distinguished on […]