THOREA. 65 



It might be supposed by some, from what has been said 

 in reference to the affinities of Thorea with the Batracho- 

 spermSf that it would naturally find a place amongst that 

 family, from which, however, it must be admitted, though 

 bearing certain resemblances to it, to be considerably es- 

 tranged by its solid and inarticulate filaments. 



This genus was constituted by Bory, in honour of Dr. There, 

 " Naturaliste de Dax, auteur d'une Chloris du departement 

 des Landes," by whom one of the species of the genus was 

 discovered. 



1. THOREA RAMOSISSIMA. 

 Plate XVI. Figs. 3, 4. 



Char. Filaments very long and much branched. Colours, 

 when recent, blackish green, turning to violet in drying. 



Bory, in Annales du Museum, vol. xii. page 128. pi. 18. 

 fig. 1. Conf. hispida ramis vagis flexuosis longissimis 

 obductis ramulis setaceis, Drap. ined. Conferva hispida 

 Thore, Mag. En eye. t. vi. p. 398. Conferva hispida 

 Thore, Chloris, 442. Conferva flexuosa jilamentis cylin- 

 draceis vittosis subgelatinosis ; ft. aqua angusta, filamentis 

 ramosis, violaceo subfuscis ; 7. pannensis. filamentis ramo- 

 sissimis, violaceo griseis, Bory, I.e. t. ii. p. 366. Batracho- 

 spermum hispidum Cand. Syn. 12. ; Flor. Franc, ii. 



. p. 60. Th. Lehmanni Lyngb. t. 13.; Harvey in 

 Manual, page 120. 



" The Thorea ramosissima grows in the Adour, where it 

 adheres to stones, to rocks, to branches, and to the stems of 

 trees which are found upon its margins. It is only to be 

 obtained there when the waters are low, in June and July. 

 It is again met with in the Seine, between Neuilly and Paris, 

 attached to different bodies, and particularly to the bottom of 

 boats. 



" From a little disc fixed upon the inundated bodies, proceed 

 certain filaments of the size of an ordinary thread, which 

 from their origin are ramified. The branches are always 



F 



