. Principles of the anatomy and physiology of the vegetable cell. Plant cells and tissues. THE VEGETABLE CELL 15 Fig IS. Ctll iiom lh„ mm «t cells of the cortical layer in Sphagnum, tlie liairs in the Cactaeea^, particular layervS of the seed-coat in Gasimrina^ Salvia, many Po- lemoniacese, &c, and in many plants to the anther-celk. Paiti- cular organs composed of such :&brous cells, not unfie- quently possess a spongy, soft consistence, e g., the outer rind of the root of many tropical Oichidaceas and Aroideae, the sepals of lUecebrum vertidllatum, the pericarp of Oachrys Morisom, (7.
. Principles of the anatomy and physiology of the vegetable cell. Plant cells and tissues. THE VEGETABLE CELL 15 Fig IS. Ctll iiom lh„ mm «t cells of the cortical layer in Sphagnum, tlie liairs in the Cactaeea^, particular layervS of the seed-coat in Gasimrina^ Salvia, many Po- lemoniacese, &c, and in many plants to the anther-celk. Paiti- cular organs composed of such :&brous cells, not unfie- quently possess a spongy, soft consistence, e g., the outer rind of the root of many tropical Oichidaceas and Aroideae, the sepals of lUecebrum vertidllatum, the pericarp of Oachrys Morisom, (7. odontalgica, the ribs of the fruit of (Etimsd Oynapium. The annular jBbre (% 19) which runs in a trans- verse direction on the cell-wall, crossing the longitu- dinal axis of the cell at right angles, is to be regaided as a slight modification of the spiral fibre. It not un- frequently occurs alternating with the spiral fibres in the same cells as the latter, e g., in the cells of many anthers, in the sporangium of the Jungermannise, and in the leaves o? Spliagmim, It may be regarded as a middle form between the right and left wound spiral fibres The reticulated structure of the secondary mem- ]J^f^^l branes occurs infinitely more frequently than the regu- lar spiral formation, and scarcely a plant can be found, from the Mosses upward, in which this structure cannot be more or less clearly distinguished in the majority of its cells. Some- tunes, but in comparatively rare cases, the secondaiy membranes of the reticulated cell resembles those of the spiral- fibrous cell, in that they are likewise divided by closely Fi<j 19 adjacent pits into narrow fibres, which fibres, however, do not run in a spiral direction, but are connected into a more or less regulovr net, with nariower or wider, roundish or angular meshes, e. r/., in the cells of the wing of the seed in Swietema, of the poiicaip of Pi- crichuon tingitanwm, , in the seed-coat of Oucurhita Pepo, of the parenc
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectplantcellsandtissues
