INTRODUCTION TO CRYPTOOAMIC EOTANY. 



209 



Fig. 52. 



a. Cutleria. multifida, fruit with 8 cells, producing large zoospores. 

 h. Fruit with 32 cells, producing spermatozoids. 



c. Zoospore. 



d. Spermatozoid. 



e. Oosporangium of StUo'phora rhizodes. 



f. Trichosporangium of ditto. 



g. Small zoospore from Oosporangium. 



h. Larger zoospore from Trichosporangium. 



All magnified, after Thuret. 



193. The divisions into which this great class naturally 

 breaks up are the following : Ectocarpece, Chordarice, Dictyo- 

 tece, Laminarice, Spovoclinacece, and Fucacece, of which a 

 tabular view is subjoined. 



Mi 



14 



£Jctocarpe<B. — Filiform. Spores or cysts external, 

 Chordarice. — Cylindrical, threads interlaced. Cysts im- 

 mersed. 



Dictyotece. — Spores or cysts superficial, collected in little 



definite patches (sori). 

 Lammarioe.—S\Mres or cysts dispersed in indefinite 



patches, or covering the whole surface. 

 Sporochnacece. — Cysts attached to external threads, which 



are free or conglobated. 

 FucacecB. — Spores on the walls of globose cavities or con- 



ceptacles. 



