. Plant life, considered with special references to form and function. Plant physiology. 242 PLANT LIFE. is divided into as many chambers as there are component carpels, and the partition liy \x-hicli the cliamliers are sepa- rated re[)resents the adjacent parts of the two carpels. Or the carpels may unite with each other at their edges only, so --|-^gâ_-p-tT^ that the line of union is at the outside ^^C;^3^^^^^ of the pistil. In this case the ovulary will have a single chamber. In both these Fig. 252.â\ li-ans\'erse . , , , ^ section f uicthods of union tlie normal numlicr of shepherd's purse
. Plant life, considered with special references to form and function. Plant physiology. 242 PLANT LIFE. is divided into as many chambers as there are component carpels, and the partition liy \x-hicli the cliamliers are sepa- rated re[)resents the adjacent parts of the two carpels. Or the carpels may unite with each other at their edges only, so --|-^gâ_-p-tT^ that the line of union is at the outside ^^C;^3^^^^^ of the pistil. In this case the ovulary will have a single chamber. In both these Fig. 252.â\ li-ans\'erse . , , , ^ section f uicthods of union tlie normal numlicr of shepherd's purse. Tlie i 1 . t i â 1 pistil consists of two chambers m the oviuary may be increased carpels, at whose united , - , edges two placenta; are by outgrowths fi-om the carpels them- formed carrying the ovules (now seeds 1. The sclvcs, as in figure 252, where from the partition from one pla- '" centato the other is an united edgcs ot the carpels a jjlate of tis- outgrowth (false parti- ^ tidn) and not part of the suc has growii oiit to meet a corrcsponcl- carpel. Magnified about 6 diam.âAfter Bessey. ing One from the Other side, so that what should be a one-chambered pistil has become two-chambered. (Compare also fig. 276.) Even simple pistils are subject to such subdivision of tlieir interior (fig. 253).. â -53 Fig. 353, âLi<i,i\-nsis. It consists of i carpel, Ijut is divided into two chambers by a false jiartition. an outgrowth f midrib of the leaf. Magnified se\'eial diam.âAfter (.iray. t^lG. 254.âTwo stages in the de\'eloptnent of the o\ule of the currant ' ^ longatudinal section of a young ovule; //.the sporangium; - â ' ' Fig. integument be longitudinal section ol a young ovule; //, the sporangium; //.inner integument be- ginning to develop as a ring at base of //; ///, the fundament of the outer integument ; m, the mother cell of the megaspores; /)', a similar section of the siiorangium alone, older, showing ///', ;//", ///"', the daughter cells of /
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectplantphysiology
