64 



MANUAL OP BOTANY 



apex, so that the oogonium is covered in by a kind of neck or 

 crown consisting of small cells. There are usually five of these. 

 Wlien the oogonium is mature these cells separate from each 



Fig. 812. 



). <\*t 



I 



r- 



;l 



Fig. 813. 



Fig. 814. 



Fig. 815. 



Fig. 811. A, Portion of tbe axis of Charafragilu. s. Nucule or oogonium. 

 n. Globule or antheridium. b. Internode. c. Crown or corona of nucule. 

 j3. Abortive leaves. j3', j3", )3". Sterile leaflets, b. sk. Nucule, and a, glo- 

 bule, botli in an eai'ly stage of development, w. Nodal cell of leaf, 

 u. Union cell between it and basal node of globule. 2. Cavity of internode 



of leaf. 6r. Cells of leaf covered^with cortex. After Sachs. Fig. 812. A 



portion of a filament, fil, of fig. 813, in the cells of which the antherozoids 



are developed ; with a 2-ciliated anlUiTozoid by its side. Fig. 813. A 



globule cut in half to show the oblong cells or manubria, c, and the septate 



filaments, fii. After Henfrey. Fig. 814. Nucule or archegonium of 



Chara. a. Apices of the spirally wound cells. Fig. 815. Vertical section 



of a nucule. 



other, leaving a small channel through which the antherozoid 

 can make its way. 



The oosphere is sohtary in the oogonimn, though as it 

 becomes ready for fertiUsation it cuts otl one or two small cells 



