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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    106. This appearance of a limb is owing to the juxtaposition of two or more elastic vesicles, closing up or opening the aperture which they form, according to circumstances ; as is manifest when the stomate is divided perpendicularly to the plane of the epidermis« But there are some modifications of this stnicture which deserve notice. In Marchantia the stomates resemble chimneys, and ai'e built up of four tiers, each tier consisting of four cells. In Myzodendron in which they occur singly on the apex of each tubercle of tiie stem, they are stated by Dr. Joseph Hooker to be incorporated into a uniform inte- gument, pi'esenting no trace of cel- lular origin, lying over a chani- ber^* traversed by viscid fila- ments, and frequently closed up by an opaque mass. 107. It has been asserted that stomates are closed by a membrane, but although that statement was erroneous, it now appears that the cuticle is sometimes extended into the chamber beneath it, in the form of a funnel- shaped expansion, open at both ends, and called the cistome In some 70 cases appendages proceed from the edge of the cistome through the intercel- lular passages, to neighbouring cistomes, which are thus connected with each other. This was first observed by Gasparrini in 1842, and the presence of these organs has been confirmed by Mohl, who, however, denies the existence of a fibrous structure such as Gasparrini's figures represent. 108. Stomates are found abundantly upon leaves, particularly on the lower surface of those organs ; occasionally upon all ])arts that are modifi- cations of the leaves, especially such as are of a leafy texture ; and on the stem. Piij. 09.—stomates of Myzodendron punctulatum; a section through stomate and epidermis; i the stomate seen from without; c from within.—y^r. Hooker. Fig. 70.—rt CLstomcs of Ornithogalum nutan.s; on the left are seen theconnectmg appendages; b a cis- tome in Cereus peruvianus.—6''«.i7)«»•/•«»«.