. "On the structure, the occurrence in Lancashire, and the source of origin of Naias graminea, Del., var. Delilei, ;. Botany. 14 ON NAIAS GEAMINEA DEL., VAB. DELILEI MAGNUS. on the same Plate at the points marked 6. In the upper part of fig. 32 the single cell seems to have been multiplied into three, but, as Dr. Magnus explains in his memoir, these long Y-shaped cells are arranged in a single linear series at the edge of the leaf; the bifurcating end of one cell encloses the solitary attenuated end of the one next to it; a section at such a junction severs the three interlock
. "On the structure, the occurrence in Lancashire, and the source of origin of Naias graminea, Del., var. Delilei, ;. Botany. 14 ON NAIAS GEAMINEA DEL., VAB. DELILEI MAGNUS. on the same Plate at the points marked 6. In the upper part of fig. 32 the single cell seems to have been multiplied into three, but, as Dr. Magnus explains in his memoir, these long Y-shaped cells are arranged in a single linear series at the edge of the leaf; the bifurcating end of one cell encloses the solitary attenuated end of the one next to it; a section at such a junction severs the three interlocked ends of two contiguous cells. The absence of this libriform tissue in the Lancashire plant has a bearing in determining its source of origin, as will be noticed further on. Between the Italian and the Lancashire plants I notice one other point of difference, which may be due to the period of growth. Above and below the central bundle of the leaf, but particularly on the lower surface, the external cells are densely packed with starch- grains, very similar to what is met with in the external membrane of the fruit. Although starch-granules are present in the membrane of the fruits of the Lancashire plant, I have failed to discover a single instance of their occurring in quantity in the leaves. All the cells of the leaf exhibit a very striking circulation of their contents against the cell-walls; the chlorophyllean granules and other protoplasmic bodies being very large, and the cell-walls being very transparent, the plant furnishes a splendid illustration of circulation, more so than in any plant which I have examined. IX.—The Inflorescence. The construction of the flowers of the genus Naias and their morphology have been minutely studied by Dr. Magnus, and the results given in his 'Beitrage,' pp. 26 to 33. In referring to the development of a side-shoot of N. graminea he says that many of the internodes are suppressed, and that from three to five pairs of leaves spring from
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Keywords: ., bookcentury1800, bookpublisherlondon, booksubjectbotany, bookyear
