. The natural history of plants, their forms, growth, reproduction, and distribution;. Botany. Y12 THE SUBDIVISIONS OF THE VEGETABLE KINGDOM. to the large amount of silica contained in the epidermal membranes. The early spring shoots of many species are unbranched and terminate in spore-beanng cones ( E. arvense, fig. 403 2), whilst later on other branching shoots arise which are sterile (fig. 4031). In other cases the fertile shoots are also branched (fig. 403 0-. Fig. 403.—Equisetaceas. 1 Summer sterile shoot o! Equisetuw, arvense. 2 Vernal, spore-bearing shoot ol Equisetwm arvense. s Fe
. The natural history of plants, their forms, growth, reproduction, and distribution;. Botany. Y12 THE SUBDIVISIONS OF THE VEGETABLE KINGDOM. to the large amount of silica contained in the epidermal membranes. The early spring shoots of many species are unbranched and terminate in spore-beanng cones ( E. arvense, fig. 403 2), whilst later on other branching shoots arise which are sterile (fig. 4031). In other cases the fertile shoots are also branched (fig. 403 0-. Fig. 403.—Equisetaceas. 1 Summer sterile shoot o! Equisetuw, arvense. 2 Vernal, spore-bearing shoot ol Equisetwm arvense. s Fertile cone of the same. * A single sporangiferous scale (sporangiophore) of the same. 6 and « Spores with "elaters" expanded and coiled. ? Equisetmn sylvaticmn with cone. ^ Prothallium of a Horse-tail with antheridia. ^, ^ ' natural size; * X 3; *X6; 5, 6x26; « X30. The branches arise from the main axis in whorls at the base of the leaf-sheaths, and in most cases perforate the latter as they develop (fig. 403'). They repeat the structure of the main axis, save that they are smaller and have fewer teeth to their leaf-sheaths. E. vruwovmum, common in this country in damp places, attains a height of two metres, and is the largest British representative of the group, but. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Kerner von Marilaun, Anton, 1831-1898; Oliver, F. W. (Francis Wall), 1864-1951; Busk, Marian (Balfour) Lady, 1861-1941; Macdonald, Mary Frances (Ewart); Kerner von Marilaun, Anton, 1831-1898. Pflanzenleben. English. New York, H. Holt and Company
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbotany, bookyear1895
