File:The natural history of plants, their forms, growth, reproduction, and distribution; (1902) (14780263701).jpg

Identifier: naturalhistoryof01kern (find matches)
Title: The natural history of plants, their forms, growth, reproduction, and distribution;
Year: 1902 (1900s)
Authors: Kerner von Marilaun, Anton, 1831-1898 Oliver, Francis Wall, 1864- Macdonald, Mary Frances Ewart Busk, Marian Balfour, Lady
Subjects: Botany
Publisher: London, Blackie
Contributing Library: NCSU Libraries
Digitizing Sponsor: NCSU Libraries

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lane. One suchsessile gland is shown in the centre of fig. 25 *. In this case the cushion consists ofthree cells. A further peculiarity has been observed in these sessile glands. Thesummit of each is marked by a tiny pore (not shown in the figure), an actual holein the wall at the geometrical centre of the convex surface. In the wall of the chamber, just below the lining epidermis, run the vascularstrands (fig. 25 ^). The vessels of which they are composed form a considerableplexus or net-work in this region. Now it is known that the ground in which PLANTS WITH TRAPS AND PITFALLS TO ENSNARE ANIMALS. 137 Lathrcea passes its existence is often drenched through with moisture in theimmediate neighbourhood of the plant. A water-excreting function has long beenattributed to the chambered leaves of the rhizomes. That such is the case hasbeen demonstrated by forcing water under pressure through the cut ends of therhizomes, when streams gush forth from the basal orifices of the leaves. In this
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Fig. 25.—Glandular structures in the Toothwort, Bartsia, and Butterwort. iPiece of an underground leaf-shoot of the Toothwort. ^Longitudinal section through the same; x2. sLongitudinal sectionthrough one of these underground leaves; x60. *Piece of the wall of a cavity; x200. sSubterranean bud of Lartnia;natural size. 6Cross-section tlirough part of this bud; x60. The margin of a bud-scale in section; x200. spiece of theepidermis of a leaf of Butterwort; x ISO. 9 Transverse section through the leaf of a Butterwort (Pinguicula alpiiia); x 50.10 Transverse section through Butterwort leaf; natural size. instance it is uncertain whether the stalked or the cushion glands assist in thisexcretion, though from the minute details of their structure it would seem probablethat it is the latter. On any other hypothesis it is difficult to understand themeaning of the pore on the summit. The matter has, however, been placed beyonddoubt by experiments on other allied plants, as, for instance, the L

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