so 



tute a natural family, and may be all referred to this genus, in which however 

 only Roth's C. mucor and C. fioccuhfa are here enumerated. 



Chaktraxsia. —F.lamenta ramofa, diffepimentis inftruEla ; femina minti- 

 tijjima, intra filamenta re. : ila, in quoque articulo numerofa. 

 This genus is named by M. Decandolle in honor of M. Girod Chantrons. 

 With one of the eight fpecies here enumerated I am entirely unacquainted, and 

 the remaining feven may be referred to at lead three different natural families, 

 i ft. C. tcrulofa and C. fiuviatilis belong to Voucher's Polyfperma, with which 

 C. glomerata alfo here retained certainly pofTeffes no affinity. 2d. C. atra, which 

 in my opinion is undoubtedly a Batrachfpermum. And 3d, C. rivu/aris, C. 

 oifa, and C. vejicata of Vaucher, which belong to his family of Prdifcree, 



Conferva. — Filamenta /implicit;, diffepimentis iuJlruEla, interdum cpe tubtili 



inter fe conjuncla, materia vivid/, nunc fpiraliter, nunc bijldlatiin, mine 



fparfm difpofita intra loculos farcla. Semina in quoque loculo folitaria. 



The genus as here conftituted is the fame with Conjugata of Vaucher, and 



contains all the fpecies arranged as fuch in the Hijlorie dei Co.'ifi. rves d'eau douce. 



Prolifera parajitica and P. fioccofi of the fame author, are alfo added under a 



feparate fe£tion, entitled, " Hand plane nota." 



Batrachospermum. — Filamenta muco gelatinofo obteila, ramofa, ramis 

 jilo hyalino plus minufae elongato terminates ; annulis ovatis, folidis, ad 

 extremum progrediendo decrefcentibus. Corpufculis hirl'u (plantularum 

 rudiment is ) inter ramos fparfts.. 

 This genus is the fame with Vaucher's Batrachof ermum, and is intended to 

 comprehend the whole of the Rivularia, as well as the Batrachofperma of Roth. 

 Hydrodyction. — Habitus Jaccatus, fire claufus, retiformis, inteijlitiis, 

 feu areolis polygon is. 

 C. reticulata, as in the fyftems of Roth and Vaucher, is here placed by itfelf. 

 Vaucheria. — Filamenta herbacea diffepimentis plane deflitula. Semina 

 externa, prima tubo adfxa, tandem cuduca. 

 This, as I have before rcmarkeJ, is the fame with Vaucher's genus Ecloferma. 



