. Botany for high schools and colleges. Botany. m BOTANY. which multiply by fission, and eventually unite into a con- tinuous tissue (in reality a false tissue), the endosperm {en, Fig. 297, B). In this mass of endosperm cells several near the micropylar end grow larger than the surrounding ones, and become filled with granular protoplasm. These are the corpuscula of Brown, the archegonia of Sachs, or the secondary embryo sacs of Henfrey {cp, cp, Fig. 297, B). In some cases they are placed singly at short distances from each other, while in others they are clustered together (1 and 2, Pig. 298
. Botany for high schools and colleges. Botany. m BOTANY. which multiply by fission, and eventually unite into a con- tinuous tissue (in reality a false tissue), the endosperm {en, Fig. 297, B). In this mass of endosperm cells several near the micropylar end grow larger than the surrounding ones, and become filled with granular protoplasm. These are the corpuscula of Brown, the archegonia of Sachs, or the secondary embryo sacs of Henfrey {cp, cp, Fig. 297, B). In some cases they are placed singly at short distances from each other, while in others they are clustered together (1 and 2, Pig. 298). Each corpusculum is at first a single cell, but when fully developed it consists of an elongated cell, the germ- cell proper, and, in many cases at least, one or more neck-cells, the whole sunk- en deeply into the sub- Fig. 298 —1. Three corpnecnia; cp. of juni- stance of the endosperm. perus communis, clrse together, and seen in a „,i i • j. t -i j_i longiiudiiial section of the ovnle ; el, the ftret The neCK IS tormed by the suspeneor cells of two fertilized (orpuBcnla— ,,• is j; * at the npper end of the corpnscula are i-hown Cutting On 01 a portion 01 lSL"%^.'l''s1iferTecrn"taTe'naM«e?at™ the Original Cell of the COr- ^i!j?f\h^reS^^lrrT"™w'eTenk1;fUP"seulum; in some cases pcnsor, with enibryo. fJ, beginning to develop, it remains single, while in 4, Longitudinal section ol the body or "nu- . t ° cleus,"**, of the ovule, shown in outline; «, others it divides SO aS tO endosperm in enlamed embryo sac ; tf', portion „ .- i -i of endosperm broken up; ep. three corpus- lOrm a vertical rOW, and cula, from the lower ends of which the suspen- - , i « pors, », grow ; p. pollen tube. 1 and 8 X 200 ; m Others a lOUr- Or CVen . X 100; 4 X Hofmeister. ^j^j^^ . ^.^^g^ tranSVCrse plane (see Fig. 298, 1) termed a the latter arrangement has been 511.—If we now review the structure of the ovule its ho- mologies c
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1885
