The elements of botany : structural and physiological : with a sketch of the artificial modes of classification, and a glossary of technical terms / by John Lindley.

  • John Lindley
Date:
1861
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Licence: Public Domain Mark

Credit: The elements of botany : structural and physiological : with a sketch of the artificial modes of classification, and a glossary of technical terms / by John Lindley. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

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    a 24. Parenchyma constitutes all the pulpy parts ; the medulla or pith, the medullary rays, a portion of the bark, and all that intervenes between the veins of leaves and other appendages of the axis. Consequently it occurs in every part of a plant, and especially in those which are succulent. 25. Prosenchyma is confined to the bark and wood, in which it only occasionally occurs. 26. A spiral line is often found in the inside of a cell, when Jibro-cellular tissue'^, or incncliyma, is produced. It sometimes happens that the membrane connectina: such fibres is ab- sorbed, leaving the fibres only to con- stitute the cell, as in the lining of the anther ; or the spires cease to be continu- break up into rings 18 or ous, and bars 27. This fibrous appearance is ex- tremely common in tissue, and by some is believed to be universal. It is, however, easily overlooked, be- cause it often is evident only while tissue is wet. This has been more especially demonstrated by Schleiden in the hairs of the ccphalium of Melocactus'''. 28. Occasionally, too, cells have their sides marked with minute transparent dots, which are regarded as being analogous to the spires of the fibro-cellular tissue 29. The spiral thread either adheres to the side ot the cell ; or is free, as in some kinds of hair. When free except at its base it forms the spiral threads or antherozoids of the antherids of mosses, <kc.,'® in which cases its elasticity and hygrometrical pro- perties give it the appearance of spontaneous motion. The leriiiinal enlargement found in such fibres is possibly h free nucleolus(G2) as Na leli has suggested ; and it may likewise be assumed with him, ia the absence of evidence to the contrary, that motile threads, or vibratory cilia, found on the sfiort-s of Alg ds and other Cryptogama'^, are of ttu analogous nature, the spora being a nucleolus.
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