180 



CRYPTOGAMS 



432. From the series given 

 above (Ectocarpus, Cutleria, 

 Rockweed) 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; 



297. Antherozoids swarming about deV id f cilia > is entirely 

 the egg cell. THUBBT. passive. 



RED ALGJE 



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

 tions, marine. 1 While many forms may be found in very 

 shallow water, many are found in deep water where, 

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



298. Red Algae: A, Delesseria sinuosa; 

 B, the so-called Irish Moss ; C, 2. 

 fresh- water species, Batrachosper- 

 mum ccsrulescens ; 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 segments ; while in many others, the 



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

 on stones in brooks. 



