The elements of botany, structural, physiological, systematicl, and medical. Being a fifth edition of the Outline of the first principles of botany. With a sketch of the artificial methods of classification and a glossary of technical terms / By John Lindley.

  • Lindley, John, 1799-1865.
Date:
1847
Catalogue details

Licence: Public Domain Mark

Credit: The elements of botany, structural, physiological, systematicl, and medical. Being a fifth edition of the Outline of the first principles of botany. With a sketch of the artificial methods of classification and a glossary of technical terms / By John Lindley. Source: Wellcome Collection.

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    5 or 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. 3 26. A spiral line is often found in the inside of a cell, when fibro-cellular tissue13, or inenchyma, is produced. It sometimes happens that the membrane connecting 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¬ ous, and break up into rings18 20 bars19. 27. This fibrous appearance is ex- 14 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 cephalium of Melocactus14. 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 tissue15. 29. The spiral thread either adheres to the side of the cell ; or is free, as in some kinds of hair. In the latter case it forms the so-called spermatic animalcules of the antheridia of mosses, &c.,1(> in which cases its elasticity and hygrometrical properties give it the appearance of spontaneous motion.” The terminal enlargement found in such fibres is probably a free nucleolus (62) . as Nageli has suggested ; and it may likewise be assumed with him, in the absence of evidence to the contrary, that motile threads, or vibratory cilise, found on the spores of some Algals17, are of an analogous nature, the spore being a nucleolus.