. Botany for high schools and colleges. Botany. 138 BOTANY. in some cases provided with sucker-like organs, by means of which they come into a more intimate relation to their hosts. 176.—Particular Relations of Phyllome to Caulome. Sachs* has formulated the relations of phyllome to caulome in substance as follows : (1.) Phyllomes always originate from the Primary Meris- tem of the punctum vegetationis ; fully differentiated tissues are incapable of producing them. (2.) They are always exogenous formations; that is, they. Fig. 119. Fig. 118. Fig. 118.—Diagrams of dichotomous branching. A, norma
. Botany for high schools and colleges. Botany. 138 BOTANY. in some cases provided with sucker-like organs, by means of which they come into a more intimate relation to their hosts. 176.—Particular Relations of Phyllome to Caulome. Sachs* has formulated the relations of phyllome to caulome in substance as follows : (1.) Phyllomes always originate from the Primary Meris- tem of the punctum vegetationis ; fully differentiated tissues are incapable of producing them. (2.) They are always exogenous formations; that is, they. Fig. 119. Fig. 118. Fig. 118.—Diagrams of dichotomous branching. A, normal dichotomy, in which each branch is again dichotomously branched ; B, helicoid dichotomy, in which the right-hand branch, r, does not develop further, while the left-hand one, I, is in every case again branched ; C\ pcorpioid dichotomy, in which the branches are alternately farther developed.—After Sachs. Fig. 119.—Diagram of botrj'ose monopodia! branching. The numerals indicate the "; develop from outer and not inner tissues, consequently their tissues are externally continuous with those of the caulome. (3.) They always originate below the growing apex of the caulome as lateral outgrowths ; they may appear singly, so that no two are situated at the same height on the stem, or two or more may grow at once, generally at equal distances from one another in the circumference of the caulome. * "Text-Book," p. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bessey, Charles Edwin, 1845- [from old catalog]. New York, H. Holt and company
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