Text-book of botany, morphological and physiological . he apex of thepro-embryo to be pushed to one side;and since this apex has the appearanceof a simple leaf uncovered by cortex,the further development of the lateralleaves which spring from the cells /,//, and ///, brings about an appearanceas if these different leaves togetherformed a whorl; and the bud of thelateral shoot thus comes to stand ap-parently in the centre of this pseudo-whorl (Fig. 203, A). If the structure which springs from the germinating spore is now compared with the pro-embry-onic branch, the perfect homology cannot fail
Text-book of botany, morphological and physiological . he apex of thepro-embryo to be pushed to one side;and since this apex has the appearanceof a simple leaf uncovered by cortex,the further development of the lateralleaves which spring from the cells /,//, and ///, brings about an appearanceas if these different leaves togetherformed a whorl; and the bud of thelateral shoot thus comes to stand ap-parently in the centre of this pseudo-whorl (Fig. 203, A). If the structure which springs from the germinating spore is now compared with the pro-embry-onic branch, the perfect homology cannot fail to be observed which Pringsheimpointed out in the parts that will be found indicated by the same letters in Figs. 198and 203; but the pro-embryo of the spore has in addition a small node at theopening of the spore from which a rhizoid, sometimes called the primary rootof Chara, springs (Fig. 198, w). The Sexual Reproduction of the Characeae results from organs which, intheir development and definite form do not, in the present state of our knowledge,. FIG. 20-^.—Chara fragiUs; A an entire pro-embryonic branch;i the lowermost colourless cell below the root-node ; rfroot-producingleafless node ; q the long cell proceeding from the middle cell of thebud-rudiment; // apex of the pro-embryo; g the pseudo-whorlof leaves, v the bud of the second generation of the leaf-bearingplant; B upper part of a young pro-embryonic branch ; z, d, q asbefore, b apex of the pro-embryo ; /, //, /// the young leaflets ofthe transitional node, v the bud of the leafy stem ; C still youngerpro-embryonic branch ; i, d, q, b as before ; /, //, /// the cells outof which the transitional nodes arise, v apical cell of the stem-bud(after Pringsheim, iSxijo). ^«4 correspond to those of Thallophytes, nor to those of Muscinese or VascularCryptogams. To the male organs or Antheridia of Characeae the term Globules isgenerally given; while the female organs, which are neither oogonia nor trichogynesno
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1875
