SECT. I 



CRYPTOGAMS 



427 



produced on the adult, 

 sexual generation; in the 

 thalloid forms, on the 

 dorsal side of the thallus; 

 in the cormophy tic forms, 

 at the apex of the stem 

 or its branches. 



The ANTHERIDIA 



(Figs. 366, 367) or male 

 sexual organs are stalked, 

 ellipsoidal, spherical, or 

 club-shaped, with thin 

 walls formed of one layer 

 of cells and enclosing 

 numerous small, cubical 

 cells, each of which 

 becomes divided diagon- 

 ally, but Avithout the 

 formation of a cell wall, 



Fio. 3(J8. — Maixhttiitiapolymorpha. A, young, B, mature arclie- 

 gonium ; C, fertilised archegoniuiii. \. ith dividing egg-cell ; 

 ¥, neck-canal-cell ; Ic", ventral-canal-cell ; o, egg-cell ; jir, 

 pseudo-iieriantli. (x 540.) 



Fiii. 3t)7. — Dcveloijuieut of the antlieridium in Fegaidla coiiica, 

 one of the Marchantiaceae. A, unicellular .stage. B, the 

 stalk-cell (st) cut off. C, D, antlieridium divided into a 

 row of cells which in turn are dividing by longitudinal 

 walls. E, cutting off of the layer of cells to form the wall 

 (»'). F, advanced stage of development. (^A-E x 400'; 

 F X 220 ; after Bolleter.) 



into two spermatozoid 

 mother- cells (i*^). At 

 maturity the spermato- 

 zoid mother-cells separate 

 and are ejected from the 

 antheridium, which rup- 

 tures at the apex. By 

 the dissolution of the 

 enveloping walls of the 

 mother - cells the sper- 

 matozoids are set free as 

 short, slightly twisted 

 filaments, bearing two 

 long cilia close to the 

 anterior end. 



The ARCHEGONIA 



(Fig. 368) are flask- 

 shaped bodies, sessile or 

 shortly stalked, some- 

 times also somewhat 

 sunk in the tissue, and 

 consist of adilated ventral 

 portion and a neck. The 

 ventral portion encloses 

 a large central cell, the 

 contents of which shortly 

 before maturity divide 





1 



if 





