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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Anatomy of Funaria (With Diagram) | Bryophytes | Botany
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In this article we will discuss about the anatomy of funaria with the help of a suitable diagram. Internally, the stem is differentiated (Fig. 4.1D) into a narrow central cylinder and a broad cortex, bound by epidermis. The epidermis is a one-cell thick layer of chlorophyllous cells. The cortex comprises thin-walled cells of relatively bigger […]
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 […]