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Phylum Lycophyta (or Lycopodophyta) -- club mosses or ground
pines or lycopods Lycopodium is homosporous--all spores are roughly equal in size. Selaginella and Isoetes are heterosporous--spores are of two distinct sizes, microspores and megaspores. Genus Selaginella |
Selaginella - a mesic or moisture-loving species Most textbooks portray Selaginella as a delicate plant requiring constant moisture. Texas, however, is home to several species of Selaginella which thrive in desert. |
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Selaginella - a xeric species in its dormant condition |
Selaginella - a xeric species after wetting |
Selaginella strobilus, l.s., 20x |
If a species' sporophytes produce two types of spores, the species is heterosporous. |
Selaginella strobilus, dissection w.m., 20x |
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Selaginella strobilus, two types of sporangia |
A mesic Selaginella with strobilus |
Selaginella - a mesic species |
This is not one leaf, it is a system of branching stems with many leaves (microphylls) |
Selaginella - growing wild (Hawaii) |
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