45° 



BOTANICAL GAZETTE 



[DECEMBER 



Development of 



— -As was stated above, both 



gametangia arise from 



thallus. 



commences to grow more 



the rest (fig. 17) and a typical nuclear division 

 l gives rise to a gametangium initial and a stalk 



Some 



3 



4 



Figs. 3, 4. — Cutleria multifida: fig. 3, one of the male gametangia, with a long 

 stalk composed of several cells; fig. 4, gametangia near maturity; one of them has 

 22 tiers of mother cells. 



times 2-7 or more subsequent divisions occur and there i 

 a filament of two or more cells, the terminal one of which 



■ 



to be a male gametangium initial (figs, i, 3, 

 becomes a long multicellular structure of a single row of ce 

 from a number of these cells there are produced lateral br 

 consisting of one, two, three, or more cells, the terminal 

 which becomes the gametangium initial (figs. 2, 21, 39). 



filament 



