180 



CRYPTOGAMS 



297. Antherozoids swarming about 

 the egg cell. — Thuret. 



432. From the series given 

 above (Ectocarpus, Cutleria, 

 Rockweecl) it is apparent 

 that the antherozoids in 

 Rockweed are in the nature 

 of reduced zoospores ; while 

 the egg cell also answers to 

 a zoospore, only in this case 

 the cell is of increased size, 

 and being from the first 

 devoid of cilia, is entirely 

 passive. 



RED ALGiE 



433. The Red Algse (Fig. 298) are, with few excep- 

 tions, marine. ^ While many forms may be found in very 

 shallow water, many are found in deep water where, 

 owing to the feeble light, no other algce can exist. In 



C 



D 



298. Red Algae: A, Belesseria sinuosa; 

 B, the so-called Irish Moss; C, a 

 fresh-water species, Batrachosper- 

 mum CKrulescens ; D, two fila- 

 ments of the last, showing the 

 cells. 



some of the smallest and simplest species the thallus con- 

 sists of loose branched filaments (Fig. 298, D); in others, 

 as in the Irish Moss (Fig. 298, B), the flattened thallus is 

 divided into narrow seofments ; while in many others, the 



1 Of fresh-water species. Batrachospermum, Fig. 298, C, is very common 

 on stones in brooks. 



