Xll SYNOPSIS OF THE ORDERS AND GENERA. 



CVIII. Sph,erozyga. Filaments free, separate, naked. 



CIX. Spermosira. Filaments free, separate; each enclosed in a very delicate, 

 membranous, filiform tube. 



Order 19. Palmellace^e. 



Sub-order. Hormospore^e. Cells contained in confervoid, simple or branch- 

 ing tubule 



CX. HORMOSPORA. 



