410 Dr. J. E. Gray on the Arrangement of the Families 



Fam. 5. Chaetophorese. 



Frond green, filiform, articulated; branches invested with 

 gelatine of a more or less determinate form. Cell filled with 

 endochrome; tips of the filaments attenuated, jointed. Sporan- 

 gium globose, on the sides or end of the branchlets. 



1. Chcetophora. Filaments aggregate, clustered, combined into 

 a gelatinous frond of definite form. C. endivcefolia. Sporidia 

 lateral. (Hassall, t. 9. f. 1,2.) ?C dilatata. Sporidia termi- 

 nal. (Hassall, 1. 13. f. 2.) 



In Chcetophora the threads are studded with globose lateral 

 cysts. 



Miiller informs us that in C. tuberculosa he has repeatedly 

 seen two kinds of cysts — one scarlet, and constituting antheridia, 

 the other larger, and at length producing spores. 



2. Draparnaldia. Filament separate, dimorphous. Cells of 

 stem and branches hyaline cross-banded, of ramuli filled with 

 endochrome. D. glomerata. (Hassall, 1. 13. f. 1.) 



" In Draparnaldia the diaphanous prolongations of the fila- 

 ment are septate, each consisting of a series of elongated cells. 

 The sporangia also in Draparnaldia glomerata and Chcetophora 

 elegans, in which species we have observed them, are formed 

 within the original cell of the ramuli, causing the latter to assume 

 a moniliform appearance. Quaternate zoospermata, which are 

 most probably gemma?, likewise occur in these species, as well 

 as in those of the genus Stigeoclonium of Kutzing." (Thwaites 

 in Harvey, Ph. Brit. t. 226.) 



Fam. 6. Blodgettiaceae. 



The genus Blodgettia of Harvey, Ner. Bor.-A-m. 46. t. . B. 

 confervoides, which he thus describes : — 



"Fronds'csespitose, branching, confervoid, articulate ; articula- 

 tions unicellular, filled with grumous viscid endochrome. The 

 cell-wall formed of separable membranes, the outer of which are 

 hyaline and homogeneous, the innermost traversed by parallel 

 longitudinal veinlets. Spores serrated, in moniliform strings, 

 and developed from the veinlets of the inner cell-wall." Appears 

 to be the type of a new family. 



B. The zoospores are small and numerous, produced in the 

 cells of the frond, which are of a uniform structure. 



Fam. 7. Confervaceae. 

 Frond green, filiform, articulated, destitute of any investing 



