44 BRITISH CHAROPHYTA. 



about 2-3 feet of water on the eastern shore of Lough 

 Mullaghderg, West Donegal, where it was discovered in 

 July, 1917, by G. K. B.-W. 



A low-growing tufted plant, moss-like in appearance, soft to 

 the touch, usually unincrusted and dark green. The primary 

 cortical-cells are often so large as almost to obscure the secon- 

 dary series. In point of definite characters it comes nearest to 

 C. contraria and G. baliica. From the former it differs in habit 

 and colour and in the uniformly short internodes, recalling in 

 appearance the tufted form of G. canescens, also in the greater 

 development, shape and persistence of the spine-cells, the more 

 strongly developed stipulodes, the smaller number of branchlet- 

 segments, and the remarkably large coronula, the cells of which 

 spread widely from their base. From G. baltica it differs in 

 habit in the much weaker and more slender stem, the very large 

 primary cortical-cells, the shape of the spine-cells, the less regular 

 stipulodes, the weaker, more slender and less numerous branchlets 

 with fewer segments, the more wide-spreading coronula and the 

 smaller antheridia. The distinctive characteristics have been 

 maintained during several years of cultivation. It is smaller 

 than the usual form^of any other British Ghara. 



9. Ghara baltica Bruzelius. 

 (Plate XXXVI.) 



C. hispida var. baltica Haktman Skand. Fl. p. 376 (1820). 

 Wahlbnbbeg Flora Suecioa, II, p. 693 (1826). 

 N. B. Bbown in Engl. Bot. ed. 3, XII, p. 207, t. 1917 (1885). 

 C. baltica Beuzblitts Obs. Char. pp. 11, 19 (1824). 

 Agabdh Syst. Alg. p. 127 (1824). 

 Bbatjn in Ann. sc. Nat. ser. 2, I p. 354 (1834) ; Consp. Charac. 



Europ. p. 6 (1867). 

 HOBNEMAN in Flora Danica, t. 2311 (1840). 

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



Phyc. VII, t. 63, f. 2 (1857). 

 Wallman Fbrsok syst. Characi. p. 85 (1853) ; Transl. p. 71 (1856). 

 Wahlstedt Bidr. Skand. Oharao. p. 16 (1862); Mon. Sver. and 



Norg. Charac. p. 34 (1875). 

 NoBDSTEDT in Bot. Notiser 1863, p. 49. 

 Babington Man. Brit. Bot. ed. VII, p. 472 (1881). 

 Bbaun & NoEDSTBDT Fragm. Mon. Charac. p. 156, t. 7, f. 232 



(1882). 

 Sydow Europ. Charac. p. 64 (1882). 

 MiGULA Die Oharaceen, p. 515, f. 114-17 (1894); Krypt.-Fl. 



Deutsch. II, ii, p. 310, t. 72 (1907) ; Syn. Charac. Europ. p. 114, 



f. 99-102 (1898). 



