REPRODUCTION. 



191 



})rocesses of conjugation in Spirogyra longata y the upper portion 

 <)i the figure shows two segments, the ceh-walls of which begin to 

 form projections at « ; at J projections are in contact. Further 

 progress is shown at ^ ; at ^ the final stages are shown. Such 

 conjugating cells are called ' ' gametes. " " Zoogametes ' ' is the 



Fig. 114. — Various stages of the anllieridial devel- 

 opment of Adiantiwi capUlus (I, II, III), 

 p, Piothalliiiin ; a, antheridiiim ; s, spermatozoid with at- 

 tached remnant of the mother-cell (b). (After Sachs.) 



Fig. 113. — Funaria hygro- 

 meirica. 



A, .^rchegonia (a) on the apex of 

 the stem between tlie leaves (6) ; 

 H. magnified arehesoniuin (in 

 fflycerini ; 6, ventral jiortion 



with oosphere ; h, neck of ar- . ,. , . » ^i t 



cliegonium ; ))(, nionih of arche- FiG. 115. — Lougitudinal section of the archego- 

 gronium, closed in B, open in C ^\xm\ of AcUantum capMus, ))efoi-e fertilization, 

 (after fertilization). (After , , ,, , , . c^ c v, ^ 



gajjlis ) A, Neck ; s, ventral canal-cell ; e, oosphere, (After Sachs.) 



term applied to conjugating swarm-spores. Fertilization among 

 Vaucheria differs very distinctly from that among Spirogyra ; in 

 the former the oogonium og (Fig. Ill) is quite different from the 

 antheridium a; osp in B is the oospore containing fat- or oil- 

 globules. 



