. Foundations of botany. Fig. 14. —Lower Part of Stem and Roots of Indian Corn, showing AerialRoots ( Brace-Roots ).a, c, internodes of the stem ; h,d,e,f, nodes of various age bearing roots. Most ofthese started as aerial roots, but all except those from 6 have now reached the earth. ROOTS 39 it may readily be transferred to moderately damp soil,and that the whole plant presents curious modificationswhen made to grow in earth instead of water. 51. Parasitic Roots.^ — The dodder, the mistletoe, and agood many other parasites^ live upon nourishment whichthey steal from other plants, called host
. Foundations of botany. Fig. 14. —Lower Part of Stem and Roots of Indian Corn, showing AerialRoots ( Brace-Roots ).a, c, internodes of the stem ; h,d,e,f, nodes of various age bearing roots. Most ofthese started as aerial roots, but all except those from 6 have now reached the earth. ROOTS 39 it may readily be transferred to moderately damp soil,and that the whole plant presents curious modificationswhen made to grow in earth instead of water. 51. Parasitic Roots.^ — The dodder, the mistletoe, and agood many other parasites^ live upon nourishment whichthey steal from other plants, called hosts. The parasitic v- —/. -4^^ f Fig. 15. — Aerial Adventitious Koots of tlie Ivy. roots, or haustoria, form the most intimate connectionswith the interior portions of the stem or the root, as thecase may be, of the host-plant on which the parasitefastens itself. In the dodder, as is shown in Fig. 16, it is most inter-esting to notice how admirably the seedling parasite isadapted to the conditions under which it is to live. Kooted 1 See Kerner and Olivers Natural History of Plants, Vol. I, pp. 171-213. 40 FOUNDATIONS OF BOTANY at first in the ground, it develops a slender, leafless stem,which, leaning this way and that, no sooner comes into
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplants, bookyear1901
