CHARA RUDIS. 29 



when they are placed one above another, not side by side, as is 

 usual with C. hispida. From G. vulgaris it differs by its larger 

 size and longer branchlets, by the production of geminate and 

 clustered spine-cells, by the more acute stipulodes, spine-cells 

 and bract-cells, the posterior bract-cells being longer, and the 

 larger fruit and antheridia. 



The difference in its distribution from that of C. hispida is 

 very marked, the latter extending over most of England, being 

 commoner in the Bast and South-Bast, while C. rudis is appa- 

 rently confined to a few northern counties, with' the exception of 

 Cambridge and Salop. In Ireland the distribution of both is 

 very similar. 



C. s'Libspinosa Ruprecht is apparently the oldest name given 

 to this species. Braun evidently had no doubt as to the identity 

 of Ruprecht's plant, having probably seen specimens, but the 

 very meagre remarks in ' Symb. ad. hist. pi. Ross.' p. 255, cannot, 

 we think, on the most liberal construction be accepted as a 

 description within the meaning of the Rules, and the name 

 would therefore be a " nomen nudum." For this reason we have 

 not cited it among the synonyms. 



5. Chara hispida Linn. 

 (Plate XXXI.) 



C major, caulibus spinosis Vaillant Mem. Acad. Sc, p. 18, t. 3, f. 3 



(1719). 

 C. hispida LiUN. Sp. Plant. II, p. 1156 (1753) pro parte. 

 Obdbr Flora Danica, I, t. 154 (1764). 

 Smith Engl. Bot. t. 463 (1798). 

 Walleoth Annus Botanicus, p. 187, t. 4 (1815) ; Fl. Orypt Germ. 



II, p. 112 (1833). 

 Bktjzblius Obs. Char. pp. 9 & 20 (1824). 

 Agaedh Syst. Alg. p. 128 (1824). 

 Bbaun in Ann. sc. Nat. ser. 2, I, p. 355 (excl. y) (1834) ; in Flora 



XVIII, i, p. 67 excl. y (1835) ; in N. Denks. Schweiz. Ges. Naturw. 



X, p. 17 (1849) ; Consp. Oharac. Europ. p. 5 (1867) ; in Monatsb. 



Akad. Wiss. Berl. for 1867, p. 922 ; in Oohn's Krypt. FL Schles. 



I, p. 407 (1876). 

 BiscHOFF Handb. bot. Term. II, t. 56, f. 2799-801, t. 57, f. 2813, 



2824-7, 2829-33 (1842). 

 CossoN & Germain Atl. Fl. Par. t. 38, f. B, 1-2 (1845) ; ed. 2, t. 42, 



f.B. 1-2 (1882). 

 KiJTZiNG Phyc. Germ. p. 259 (1845) ; Sp. Alg. p. 524 (1849) ; Tab. 



Pbyc. VII, t. 65, 66, 67, f. 1, (1857). 

 Gantekee, Oesterr. Char. p. 17 (1847). 

 Babenhoest Deutsch. Krypt. PI. II, p. 198 (1847) ex parte. 

 Babington in Ann. and Mag. Nat. Hist. ser. 2, V, p. 89 (1850). 



