The elements of botany for The elements of botany for beginners and for schools elementsofbotany00gray Year: 1887 and dissemination by four club-shaped threads attached to one part of them. These are hygrometric : when moist they arc rolled up over the spore ; when dry they straighten, and exhibit lively movements, closing over the spore when breathed upon, and unrolling promptly a moment after as they dry. (See Fig. 493-493.) 4S6. Ferns, or Filices, a most attractive family of plants, are very numerous and varied, in warm and equable climates some rise into forest-trees, with habit of Palms;
The elements of botany for The elements of botany for beginners and for schools elementsofbotany00gray Year: 1887 and dissemination by four club-shaped threads attached to one part of them. These are hygrometric : when moist they arc rolled up over the spore ; when dry they straighten, and exhibit lively movements, closing over the spore when breathed upon, and unrolling promptly a moment after as they dry. (See Fig. 493-493.) 4S6. Ferns, or Filices, a most attractive family of plants, are very numerous and varied, in warm and equable climates some rise into forest-trees, with habit of Palms; but most of them are peren- nial herbs. The wood of a Fern-trunk is very dif- ferent, however, from that of a palm, or of any exogenous stem either. A section is represented in Fiur. 500. The curved plates of wood each ter- 500 Fig. 498. Upper part of a stem of a Horsetail, Eqnisetum aylvaticum. t'.'t. Part of the head r Bpike of spore-cases, with of the latter taken off. !!'.'•. View (more enlarged) of under Bide of the Bhield-shaped body, bearing a circle of spore- cases. 496. One f tin- latter detached and more magnified. l!'7. A --pore with the attached arms moistened. 198. Same when dry, the anus extended. Fio. i1.''.'. A Tree-Fern, Dicksonia arboresoens, with a yonng one near it- base. In front a common herbaceous Pern (Polypodium vulgare) with its creeping stem or root stock. Fl(». 500. A section oi the trunk ut a Tree-Fern.
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