SporePlants213-page6

SporePlants213-page6 - Spore-Dispersing Vascular Plants - 6...

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Unformatted text preview: Spore-Dispersing Vascular Plants - 6 Selaginellae (Selaginella) The genus Selaginella is widespread in the moist tropics, and in the temperate rain forests. Some Selaginella species are also found in arid lands, where they successfully desiccate. Most plants are tightly coiled when desiccated. Selaginella lepidophylla is sold as the “resurrection” plant because it can be “revived” when watered, photosynthesize for a bit, and when water is unavailable, desiccate for several years until “revived” again. Selaginella is found in the Washington rain forest and also in eastern Washington arid rocky areas. Humid habitat Selaginella Arid habitat Selaginella Selaginella sporophytes are said to be radially symmetrical, but microphylls are often 2 – or 4-ranked. When 4-ranked the stems may appear square. Some are prostrate, flattened and seem to have bilateral symmetry. Each microphyll has a little scale-like outgrowth called a ligule. Sporangia may in axillary or in short terminal strobili. Selaginella is heterosporous. Both megasporangia and microsporangia are found within the same strobilus, however. Selaginella strobilus ...
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This note was uploaded on 01/08/2012 for the course BIO 213 taught by Professor Makina during the Fall '09 term at SUNY Stony Brook.

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