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The lycophytes, which make up less than 1% of the species of living vascular plants, have small leaves (microphylls or more specifically lycophylls), which develop from an intercalary meristem (i.e., the leaves effectively grow from the base). The euphyllophytes are by far the largest group of vascular plants, in terms of both individuals and ...
stem with microphylls. genus Drepanophycus Göppert microphylls short, tapering rapidly from wide base (thorn-shaped) microphylls arranged spirally or randomly on stem; sporangia borne on upper surface of microphylls; genus Baragwanathia Lang & Cookson microphylls long, not tapering over most of length (strap-shaped) microphylls arranged ...
microphylls arranged spirally or randomly on stem; sporangia borne on upper surface of microphylls; Baragwanathia Lang & Cookson microphylls long, not tapering over most of length (strap-shaped) microphylls arranged spirally on stem; sporangia borne axially (whether on microphylls or on stem is not known)
The sporangia open by lateral dehiscence to release the spores. The spores bear characteristic elaters , distinctive spring-like attachments which are hygroscopic : i.e. they change their configuration in the presence of water, helping the spores move and aiding their dispersal.
Rosacea. What it looks like: Rosacea causes redness and thick skin on the face, usually clustered in the center.Easy flushing, a stinging sensation, and small, pus-filled pimples are other common ...
They have dichotomously branching stems bearing simple leaves called microphylls and reproduce by means of spores borne in sporangia on the sides of the stems at the bases of the leaves. Although living species are small, during the Carboniferous , extinct tree-like forms ( Lepidodendrales ) formed huge forests that dominated the landscape and ...
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