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 […]
Diagram of Pteridium| Pteridophytes | Archegoniate Plants | Botany
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The rhizome in Pteridium is subterranean with numerous dichotomous forkings and is capable of indefinite growth. Pteridium aquilinum, the common bracken fern, is the first to invade cultivated fields and when once established is difficult to eradicate. This is one of the ferns able to compete with flowering plants as a weed. It is mainly […]