110 BRITISH CHAKOPHTTA. 



The outer meaibraiie of N. spanioclema exhibits the charac- 

 teristics of N. opaca and N. flexilis as regards the rorid and 

 mottled under-surface and the wart-like surface^ but occa- 

 sionally the protuberances are smaller and more prominent. 

 It is however markedly distinguished from the membranes 

 of these two species in that its surface is covered with an 

 •exceedingly minute decoration, granular in character and 

 assuming a somewhat net-like disposition, This decoration 

 is not easy to detect in some membranes but is very evident 

 in others. It is observable also on the flanges which, as 

 in the case of N. opaca and N. flexilis, are often con- 

 ■spicuously developed at the apex of the oospore. 



Section 2. ABTHBOBAGTYLM { = DiarthrodacUjIse 

 and Polyarthrodadylas Bbaun). 



Ultimate rays two- or more-celled. 



Subsection 1, Homoeoclemee (= Homveophyllas Br&nu) . 

 Whorls simple, composed of a single circle of similar 

 branchlets. 



5. Nitella translucens Agardh. 

 (Plate XI.) 



Chara translucens major flexilis YAlULAT'ti'M.eia. Acad. Boy. Sc, 1719, 



p. 18, t. 3, f . 8. 

 -C. flexilis ft Smith PI. Brit. Ill, p. 1384 (1804). 

 C. translucens Peesoon Synopsis, II, p. S31 (1807). 

 Smith Engl. Bot. No. 1855 (1808). 

 Beatjn in Ann. Sc. Nat., ser. 2, 1, p. 352 (1834) ; in Flora, XVIII. i, 



p. 50 (1835). 

 Babington in Ann. & Mag. Nat. Hist. ser. 2, V, p. 84 (1850). 

 C. flexilis Thuilliee F1. Par. ed. 2, p. 472 (1799) pro parte. 

 Nitella translucens Agaedh Syst. Alg. p. 124 (1824). 

 OossoN & Geemain Atl. Flor. Par. t. 40, f.B (1845) ; ed. 2, t. 46, f.O 



(1882). 

 KtjTziNG Sp. Alg. p. 513 (1849); Tab. Phyc. VII, t. 26, f. 1 (1857). 

 Payee Bot. Orypt. f. 171 (1850). 



Wallman Porsok syst. Oharac. p. 31 (1853) ; Transl. p. 27 (1856). 

 Wahlstedt Bidrag Skand. Charac. p. 2 (1862) ; Men. Sver. & Norg. 



Charac. p. 17 (1875). 

 NoESTEDT in Bot. Notiser, 1863, p. 36 ; in Flora Danica, No. 2929 



(1877). 

 Ceepin in Bull. Soc. Bot. Belg. II, p. 128 (1863). 

 Leonhardi in Verh. Naturf. ver. Briinn, II, p. 173 (1864). 

 Beaun in Monatsb. Akad. Berl. for 1867, p. 879 (1868). 

 Geoves in Joum. Bot. XVIII, p. 165, t. 210, f. 17 (1880). 



