Text-book of structural and physiological botany . ,Anemia^ Lygodiuin. 4. OsmundacecE. Sporangia shortly stalked; annulus running round oneside only; dehiscence longitudinal ; Osmunda, Todea. (Fig. 440 ill.). 5. Cyatheacece. Annulus complete, oblique, eccentric ; dehiscencetransverse ; sorus generally on a strongly developed receptacle :Alsophila, Hemitelia, Cyathea ; most tree-ferns. 6. Polypodiacece. Annulus vertical and incomplete ; dehiscencetransverse :—Acrostichujn, Folypodijim, Adiantum^ Fteris, Blechnum,Asplenium, Scolopendrium^ Aspidmm, &c. (Fig. 439 l-V., 440 I.). 7. MaraitiacecE. Sp
Text-book of structural and physiological botany . ,Anemia^ Lygodiuin. 4. OsmundacecE. Sporangia shortly stalked; annulus running round oneside only; dehiscence longitudinal ; Osmunda, Todea. (Fig. 440 ill.). 5. Cyatheacece. Annulus complete, oblique, eccentric ; dehiscencetransverse ; sorus generally on a strongly developed receptacle :Alsophila, Hemitelia, Cyathea ; most tree-ferns. 6. Polypodiacece. Annulus vertical and incomplete ; dehiscencetransverse :—Acrostichujn, Folypodijim, Adiantum^ Fteris, Blechnum,Asplenium, Scolopendrium^ Aspidmm, &c. (Fig. 439 l-V., 440 I.). 7. MaraitiacecE. Sporangia placed singly on lateral veins of thepinnae : Marattia.—Ed.] Class VIII. Equlsetacece, The aerial stem of the Horsetails springs from a creepingrhizome which produces at its nodes a number of adventitiousroots. The stem is herbaceous, usually furrowed, simple orbranched, jointed, and provided at the joints Or nodes withtoothed sheaths formed by the coalescence of the leaves attheir base. The habit of the plant depends on this mode. Fig. 443 \.—Eqtn-setum sylvatictcni;a a fertile shoot,not containingchlorophyll, bear-ing the sporangiaat its summit; h afertile green s-hoot;between these asterile green shoot(reduced); thesethree kinds ofshoots do notalways occur. 318 Structural and Physiological Botany, in which the leaves, are formed, and on the verticillate ar-rangement of the branches which spring from buds in thecortex (Fig. 443). While, in respect of their vegetativeorgans, they can be compared only with the Australian IV.
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