. Carnegie Institution di Washington la pubblicazione. Struttura. 43, 12, 13, 14, f, 15, 1, 6, 17, f, 18, 19, 20, f, 21, 22, 23, f, 24, 25, 26, f, &c; la spirale primaria sembrava di essere a volte ^T, talvolta superiore. N. rubra nel giardino di Monaco di Baviera (che Raciborski considerato era più probabilmente un ibrido) mostrava i, 2, f, 3, 4, 5, 6, f, 7, 8, f, 9, 10, n, 12, f, 13, 14, 15, 16, f, 17, 1, 8, f, 19, 20, 21, 22, f, 23, 24, 25, 26, f, 27, 28, f, 29, 30, 31, 32, f, 33, 34, 35, 36, f, 37, 38, f, 39, 40, 41, 42, f, 43, 44, 45. 46, f, 47. 48, f, 49. 50, 51- 52, f, 53- 54, 55- 56, f. 57, 58, f, 59, 60, 61, 62, f

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. Carnegie Institution of Washington publication. STRUCTURE. 43 12, 13, 14, f, 15, 1 6, 17, f, 18, 19, 20, f, 21, 22, 23, f, 24, 25, 26, f, &c; the primary spiral seemed to be sometimes ^T, sometimes higher. N. rubra in the Munich garden (which Raciborski considered was more probably a hybrid) showed i, 2, f, 3, 4, 5, 6, f, 7, 8, f, 9, 10, n, 12, f, 13, 14, 15, 16, f, 17, 1 8, f, 19, 20, 21, 22, f, 23, 24, 25, 26, f, 27, 28, f, 29, 30, 31, 32, f, 33, 34, 35, 36, f, 37, 38, f, 39, 40, 41, 42, f, 43, 44, 45. 46, f, 47. 48, f, 49. 50, 51- 52, f, 53- 54, 55- 56, f. 57, 58, f, 59, 60, 61, 62, f, &c.' The structure of the stem in Nymphaeaceae has long been a puzzle, and for the most part still remains so. A transverse section of any vegetative stem of Nymphaea (Fig. 16) shows to the unaided eye three well-marked regions, viz., (i) an outer wall of dense cellular tissue, about o. 16 cm. thick, consisting of epidermis and exo-cortex, (2) a medio-cortex full of large lacunee or air-spaces, (3) a dense central core traversed in every direction by vascular bundles. The second layer is traversed by numerous trabeculae of denser tissue connecting the exo-cortex with the central core. The following description applies only to normal vegetative stems, not to stolons or resting tubers. Microscopically examined, a well-marked epi- dermis is always present. In N. lotus and odorata /T7- _ .1 • • -11 111 FIG. 16.— Rhizome of JT. odor- (rig. 17) this is an irregular layer as to the level aia- transverse section ot in- of the cells on the outer and inner sides, and as. to their size, though they are approximately cubical heavy llnes are v«scular bun- ' , , , . , , • , dles- Natural size, in shape. 1 he walls are equally thin on all sides. In N. flava the cells are much shallower than long or broad (about 2:1) and form a more even surface. With the exception of a very minute area at the growing point of the stem, its whole surface is covered with hairs. Where these first

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• bookauthorcarnegie
• bookcentury1900
• bookdecade1900
• bookyear1905