DRAPARNALDI A. 121 



sufficient to break it, and it is often a matter of considerable 

 difficulty to remove a specimen entire from the water for 

 preservation, each frond breaking as soon as the hand is placed 

 beneath it, and its own gravity is felt, and dividing into 

 many separate pieces, which are slowly carried away by the 

 gentle stream in which the species is usually found. It ad- 

 heres closely to paper, and does not undergo any considerable 

 change of colour in drying, it also recovers like the Batra- 

 ckospermece much of its freshness on being moistened. These 

 last remarks apply to all the species of the genera Drapar- 

 naldia and Chatophora. 



2. DRAPARNALDIA PLUMOSA Ag. 

 Plate XII. Fig. 1. 



Char. Frond subgelatinous. Filaments gracile, elongated. 

 Branches subpinnate. Tufts elongated, scattered, ap- 

 proximate to the branches, ciliated, 



Batrachosperme en plume, Vauch. Conf. 113. pi. xi. fig. 

 2. and 4. ; Cand. Fl. Fr. ii. 59. Batrachospermum plu- 

 mosum, truncis elongatis ; ramulis cauli approximatis, 

 Cand. Syn. 143. Draparnaldia hypnosa Bory, in An- 

 nales du Museum, 405. pi. 35. fig. 2. D. plumosa Har- 

 vey, in Hook. Br. Fl. ; in Manual, 121. Conf. lubrica, 

 E. B. t. 2087. 



Hob. Galway : M c Colla. Aberdeen: Dr. Dickie. Med- 

 hurst and Eastbourn : Mr. Jenner. Stream near Hod- 

 desdon : A. H. H. 



This species is more slender, less gelatinous, and attains 

 a much greater length than Draparnaldia glomerata. It 

 lives also in purer and deeper water, is usually of a brighter 

 and more beautiful green, and, from being less gelatinous, 

 it is also less fragile. The mode of branching is different in 

 the two species; the tufts in that which is here described 

 are longer, more scattered, approximated to the branches, and 

 not as in the previous species divergent. It is an elegant 

 species. The cells of the stems are usually shorter, and rarely 

 so inflated or oval as those of D- glomerata. 



