174 INTRODUCTION TO CRYPTOGAMIC BOTANY. 



those of the Melanosperms, one or two genera of which, 

 probably, outweigh, in this respect, all other Algae put 

 together. 



loO. The two following divisions comprise the several forms: 



1. GongylospernnecB. Nucleus simple or compound. En- 

 dochromes divided, spores at length conglobated. 



2. Desiniospermece. Nucleus consisting of tufted spore- 

 threads, adhering to a placenta. Endochromes single. 



These groups are again divisible, as in the following tabular 

 view : 



