The Encyclopaedia Britannica; .. A dictionary of arts, sciences and general literature . with a thick epiderhiis. A toboles is a creepingunderground stem, sending roots from one part and leafbuds from another, as in Couch-grass, Carex arenaria,- andScirpus lacustris. It is often called a creeping root, but isreally a rhizomo with narrow elongated internodes. Atuber is a thickened stem or branch produced by theapproximation of the nodes and the swelling of the inter-nodes, as in the Potato. The eyes of the Potato are leaf-buds. Tubers are sometimes aerial, occupying the place ofbranches. The or
The Encyclopaedia Britannica; .. A dictionary of arts, sciences and general literature . with a thick epiderhiis. A toboles is a creepingunderground stem, sending roots from one part and leafbuds from another, as in Couch-grass, Carex arenaria,- andScirpus lacustris. It is often called a creeping root, but isreally a rhizomo with narrow elongated internodes. Atuber is a thickened stem or branch produced by theapproximation of the nodes and the swelling of the inter-nodes, as in the Potato. The eyes of the Potato are leaf-buds. Tubers are sometimes aerial, occupying the place ofbranches. The ordinary herbaceous stem of the Potato,when cut into slips and planted, sends off branches from itsbase, which assume the form of tubers. Tubers frequentlystore up a quantity of starch as in Maranta arundinacea,whence arrowroot is derived. Another form of thickenedunderground stem is the corm, as seen in the AutumnCrocus (Colchicum, fig. 69), Gladiolus, &c. Structurally itis composed of a solid more or less rounded axis coveredby a layer of thin membranous scales (fig. 70, h, A). A. rig. 69, Fig. 70. rio. M.—Conn of Moadow Saffron (eolchtmm autumnale). a, old corm sbrlTel-Unp: 6, young corm produced laterally from the old one. Pig. fO.—CornjB of ColcMcum auiumnafe In autumn when the plant Is In fio-^, oldest corm; A. A, brown scales covering It; tr, its roots; tt, its withered flower-ing stem; *, younger corm produced from *; vh, roots from i, which grows atexpense of i; i. s, i, sheathingleaves; (,f, foliage leaves; 6, ^ flowers; t,younc corm produced from f in aiaufflll, and which In succeeding autumnwill produce flowers. (Sachs.) corm is only of one years duration, giving off buds annuallyin the form of young corms. In autumn the young cormgives origin to leaves, the lower of which (s, «, s) formsheaths round the corm and flower-stalk, the upper {I, l) re-maining very small; and in the axil of the uppermost leavesthe flowering-stem develops and bears the flowers (b, b
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectencyclo, bookyear1902
