Text-book of botany, morphological and physiological . V\C,. -573. — Diagrammatic rcpresentatif>n of tlieformation of the primary root in Monototylcilonsand its connection with the stem (after Hansteiii);V pro-embryo, h liypophysis, iv iu line of separation ofthe root and stem, ivh layer of the root-cap, d derma-togen, pb pcriblem, // Fig. 374. — Diagi-ammatic representation of theformation of the embryo of Dicotyledons (afterHanstein) ; i, 2, the first layer Of the root-cap,/ peri-blem, d dermatogen, pi plerome. apex towards the periphery of the apex of the root; in the secondar
Text-book of botany, morphological and physiological . V\C,. -573. — Diagrammatic rcpresentatif>n of tlieformation of the primary root in Monototylcilonsand its connection with the stem (after Hansteiii);V pro-embryo, h liypophysis, iv iu line of separation ofthe root and stem, ivh layer of the root-cap, d derma-togen, pb pcriblem, // Fig. 374. — Diagi-ammatic representation of theformation of the embryo of Dicotyledons (afterHanstein) ; i, 2, the first layer Of the root-cap,/ peri-blem, d dermatogen, pi plerome. apex towards the periphery of the apex of the root; in the secondary roots ofTrapa, Hanstein and Reinke state that the reverse is the case. Lateral roots not unfrequently arise in the embryo even before the ripening ofthe seed, in addition to the primary root which we have hitherto alone considered;as, for instance, in many Grasses and some Dicotyledons { Impatiens, accordingto Hanstein and Reinke, Cucurbita from my own observations). In Trapa natansthe primary root soon becomes abortive, laferal roots arising at an early period fromthe hypocotyledonary portion of the axis. Hanstein and Reinke state that the lateral roots of Angiosperms have theirorigin in the pericambium, in Nagelis sense of the term\ Their development wasfound in several plants to harmonise with this. In Trapa naians, for example,
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1875
