The elements of botany for beginners and for schools . e. Water-Ferns. 485. Horsetails, Equisetacea, is the name of a family which consistsonly (among now-living plants) of Equisetwm, the botanical name of Horse-tail and Scouring Rush. They iiave hollow stems, with partitions at thenodes; the leaves consist only of a whorl of scales at each node, thesecoalescent into a sheath: from the axils of these leaf-scales, in many species,branches grow out, which are similar to the stem but on a much smallerscale, close-jointed, and with the tips of the leaves more apparent. At theapex of the stem appea
The elements of botany for beginners and for schools . e. Water-Ferns. 485. Horsetails, Equisetacea, is the name of a family which consistsonly (among now-living plants) of Equisetwm, the botanical name of Horse-tail and Scouring Rush. They iiave hollow stems, with partitions at thenodes; the leaves consist only of a whorl of scales at each node, thesecoalescent into a sheath: from the axils of these leaf-scales, in many species,branches grow out, which are similar to the stem but on a much smallerscale, close-jointed, and with the tips of the leaves more apparent. At theapex of the stem appears the fruetifieation, as it is called for lack of a betterterm, in the form of a short spike or head. This consists of a good num-ber of stalked shields, bearing on their inner or under face several wedge-shaped spore-oases. The spore-cases when they ripen open down the inner SECTION 17.] PTERIDOPHYTES. 157 side and discharge a great number of green spores of a size large enoughto be well seen by a hand-glass. The spores are aided in their discharge.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1887
