64 



MANUAL OF 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. 

 When the oogonium is mature these cells separate from each 



Fig. 811. 



Fig. 812. 



[^^FiG. 814. 



Fig. 815. 



Fiff.Sll. A. Portion of the axis of Charafragilis. s. Nucule or oogonium. 

 a. Globule or autheridium. b. Internode. c. Crown or corona of nucule. 

 /3. Abortive leaves. (3', ^", ^". SterUe leaflets. B. sk. Nucule, and a, glo- 

 bule, both in an early stage of development, ir. Nodal cell of leaf. 

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



of leaf. hr. 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 autiierozoids 



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



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



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



Cham. n. Apices of the spirally wound cells. /'/>/. 815. Vertical section 



of a nucule. 



other, leaving a small chamiel through which the antherozoid 

 can make its way. 



The oosphere is solitary in the oogonium, though as it 

 becomes ready for fertilisation it cuts off one or two small cells 



