. Plant anatomy from the standpoint of the development and functions of the tissues, and handbook of micro-technic. g cells have broken downand left their secretion within thecavity thus formed; o, large drop ofsecreted oil. (After Sachs.) lysigenously, and to designate this method the term schizoly-sigenous is compounded. Interior glands of protodermal origin solely are found inAmorpha, Myrtus, Eugenia, Asarum, Croton, Crotonopsis,and some species of the Moraceae, Urticaceae, Acanthaceae,Saxifragaceae, Crassulaceae, Geraniaceae, and other far the larger number of interior glands,
. Plant anatomy from the standpoint of the development and functions of the tissues, and handbook of micro-technic. g cells have broken downand left their secretion within thecavity thus formed; o, large drop ofsecreted oil. (After Sachs.) lysigenously, and to designate this method the term schizoly-sigenous is compounded. Interior glands of protodermal origin solely are found inAmorpha, Myrtus, Eugenia, Asarum, Croton, Crotonopsis,and some species of the Moraceae, Urticaceae, Acanthaceae,Saxifragaceae, Crassulaceae, Geraniaceae, and other far the larger number of interior glands, however, are formedby the ground or fundamental meristem. LATICIFEROUS VESSELS 203 Interior tubular or canalicular glands are formed in essen-tially the same manner as the globular. A circular group ofcells as seen in cross section, and a long vertical row as seen inlongitudinal section, forms an intercellular space schizogen-ously or lysigneously at its center throughout its length. Ifformed schizogenously the secreting cells form a sheath aroundthe intercellular canal as seen in Fig. 113, and into this canal. f FIG. 113.—Resin duct in leaf of Pinus silvestris, in cross section at A, and in longi-tudinal section at B; h, cavity surrounded by the secreting cells;/, /, sclerenchyma fiberssurrounding and protecting the duct. (After Haberlandt.) are excreted the secretions of the sheath cells. Fine examplesof tubular canals are found in the needles and stems of pines. In the few instances where the tubular glands are differen-tiated from procambium strands they have the same methodof formation as have those from the ground meristem. Thetubular glands often branch and anastomose and thus forma complex glandular system. Laticiferous Vessels or Milk Tubes.—The milk tubesoccurring in many families of plants form a much-branched,richly anastomosing system extending practically throughoutthe whole plant (Fig. 114). They have twro methods of the Lobeliacese, Cichoriacese, P
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