Text-book of structural and physiological botany . 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 Fig. 443 II,—A peltate scale bearing the spor
Text-book of structural and physiological botany . 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 Fig. 443 II,—A peltate scale bearing the sporangia on its inner side facing the stem,five being visible (magnified); III. spore with the elaters unrolled which vi^erepreviously coiled spirally round it (greatly magnified) ; IV. E. JiMviatile; rhi-zome covered everywhere with root-hairs, and having four tubers about the size ofhazel-nuts which would, under favourable conditions, develope into new stems. dicotyledonous Casuarinese and the extinct Calamites, intheir mode of reproduction the Equisetaceae closely resembleFerns. In the internal structure of the stem the air-cavitiesare of great importance. Its centre is occupied by a largecentral air-cavity (Fig. 444 A, c) ; and in the surroundingring of tissue, which is often rather narrow, there is almostalways a cortical air-cavity (Fig. 444 A, r) between each
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