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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 ...
Reconstruction of Aglaophyton, illustrating bifurcating axes with terminal sporangia, and rhizoids. Modern polysporangiophyte, monarch fern is a vascular plant. Scientific classification; Kingdom: Plantae: Clade: Embryophytes: Clade: Polysporangiophytes Kenrick & Crane (1997) Subgroups non-vascular fossil Polysporangiophytes †Horneophytopsida ...
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)
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 ...
This ejection ensures exit of the spores from the reproductive structures as well as travelling through the air over long distances. Many fungi thereby possess specialized mechanical and physiological mechanisms as well as spore-surface structures, such as hydrophobins , for spore ejection.
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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