Text-book of botany, morphological and physiological . the septa of the rows of cells become partially,sometimes entirely, absorbed; but their latex is notmilky, and contains numerous needle-like crystalsof calcium oxalate (raphides). To these must beadded numerous other structures in Monocoty-ledons which bear scarcely any other resemblanceto laticiferous vessels ; in some genera of Liliaceae(Scilla, Ornithogalum, Muscari) the vesicular vesselsoften form shorter interrupted rows of cells, andin the bulbs themselves larger isolated paren-chyma-cells, similar to the former in containing raphide
Text-book of botany, morphological and physiological . the septa of the rows of cells become partially,sometimes entirely, absorbed; but their latex is notmilky, and contains numerous needle-like crystalsof calcium oxalate (raphides). To these must beadded numerous other structures in Monocoty-ledons which bear scarcely any other resemblanceto laticiferous vessels ; in some genera of Liliaceae(Scilla, Ornithogalum, Muscari) the vesicular vesselsoften form shorter interrupted rows of cells, andin the bulbs themselves larger isolated paren-chyma-cells, similar to the former in containing raphides. That the cells containingraphides can, however, actually unite into tubes, which morphologically altogetherresemble laticiferous vessels, is shown in the Gommelynaceae. Here rows of cells whichare early distinguished from those which surround them by containing raphides arise inthe young parenchyma of the fundamental tissue of the internodes and leaves ; they nolonger divide; while their neighbours continue to become shorter by septa, they remain. Fig. 95.—Longitudinal section through the bulb-scale of Alliitni Cepa; e the epidermis ; c the cu-ticle ; / parenchyma; sg the latex of the vesicularvessel coagulated by solution of potash; ^r ^r itsseptum; the longitudinal wall exhibits a pittedstructure; it separates the vesicular vessel, in thiscase very visible, from one lying behind it. LATICIFEROUS AND VESICULAR VESSELS, ETC. 3 longer, and their septa become absorbed, according to Hanstein, by the growth of thewhole organ, by which the cells are extended. Thus long continuous tubes, filledwith raphides of enormous length, arise out of the rows of cells of the fundamentaltissue containing crystals. (b) The term Glands^ is applied to single cells or groups of cells which arestrikingly distinguished by their contents from the surrounding tissue, especially whenthey contain odoriferous, strong tasting, coloured, oily, or resinous substances, whichfind no further use in changes
Size: 1277px × 1957px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1875
