Additional Sources of Variation12

Additional Sources of Variation12 - Plant classification....

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Plant classification. Division Characteristics Examples and Uses Bryophyta nonvascular plants, gametophyte dominanted life cycle mosses, liverworts, hornworts Psilophyta naked photosynthetic stems, no leaves, free-sporing Psilotum nudum , Tmesipteris ;no commercial uses Lycophyta (the club mosses) microphyll leaves, sporangia in strobili; more significant in the Paleozoic Lycopodium , a homosporous plant, Selaginella , a heterosporous plant; no commercial uses except as ground cover in some areas Sphenophyta (= Equisetophyta; the horsetails) megaphyll leaves, sporangia in tight cones; plants with jointed stems; more significant in the Paleozoic Equisetum , the scouring rush or horsetail; no commercial applications Filicophyta (ferns) megaphyll pinnately compound leaves, sporangia on underside of leaves, clumped in sori; leaves arise by circinnate vernation (uncoiling to look initially like a crozier or sheperd's crook) Ornamental plants such as the Boston fern; tree ferns; commercial applications as
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Additional Sources of Variation12 - Plant classification....

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