. Vergleichende Anatomie der vegetativen Organe Der phanerogamen und Farne. Anlage Anatomie; Phanerogamen; Farne. EPIDERMIS. 43 zwischen der äußeren und der inneren Mauer, die keine seitliche Wand berührt, und das schmälert konisch nach innen. In Aneimia (Abb. 6), oder vielmehr das stoma, ist daher Sur - durch eine ringförmige epidermalen Zellen abgerundet. Fast das gleiche gilt für Polypodium lingua (siehe oben, ich. c); der ringförmigen Zelle ist wiederum in der Regel durch ein Hufeisen-förmigen Nachbar, aus der er ursprünglich durch einen U-förmigen Mauer getrennt war umgeben. Aber oft (Rauter, Abb. r 8) Auch diese Wand ist nicht U-Shap

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. Comparative anatomy of the vegetative organs of the phanerogams and ferns. Plant anatomy; Phanerogams; Ferns. EPIDERMIS. 43 between the outer and inner wall, which touches no lateral wall, and which diminishes conically inwards. In Aneimia (Fig. i6) it, or rather the stoma, is therefore sur- rounded by an annular epidermal cell. Almost the same applies for Polypodium lingua (see above, i.c); the annular cell is in its turn as a rule surrounded by a horse- shoe-shaped neighbour, from which it was originally separated by a U-shaped wall. But often (Rauter, Fig. r8) also this wall is not U-shaped, but annular, the stoma is thus sur- rounded by two concentric annular cells. In Aneimia Phyllitidis, and hirta, as in Poly- podium lingua, it happens exceptionally, and in Aneimia villosa (according to Stras- burger) it is the rule that the typically annular walls are U-shaped, and attached to a lateral wall. Those of the mature parts are arranged accordingly. Further it occurs not unfrequently that from one or from both ends of the stoma (and in the former case, according to Strasburger, always the peripheral end) a membrane runs bridge-wise to the nearest lateral wall (Fig. i6, c). In face of the many attempts to explain and interpret this phenomenon it may be remarked, that from the first there is nothing more than the appearance shows at once, that is a membranous band, arranged as described, growing with the other membranes, and requiring an explanation of its appearance no more and no less than any other membrane. The second case, which is to a certain extent peculiar, but which otherwise belongs to the group (3. a), is the formation of the stoma of the Equiseta. It is here stated according to Strasburger {I.e.). The Initial cell, the first appearance of which was not observed, is nearly cubical, the two flanks being parallel to the longitudinal axis of the stem. Near to its own longitudinal axis, thus defined, there appear symmetrically, right and left, two nearly ra

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• bookcentury1800
• bookdecad
• booksubjectplantanatomy
• bookyear1884