NITELLA HYALINA. 127 



10. Nitella byalina Agarclh. 

 (PLATE XVI.) 



Cham hyalina DE CANDOLLE Flore Fraiicaise, Y, p. 247 (1815) ex parte. 

 BRAUN in Ann. Sc. Nat. ser. 2, I. p. Sol (1834) ; in Flora, XVIII, i, 

 p. 54 (1835). 



C. condensata and C. interrupta RUPRECHT Symb. Hist. PI. Ross, 

 pp. 78-79 (I8o),fide Braun. 



Nitella hyalina AGARDH Syst. Alg. p. 126 (1824) ex parte. 



KUTZING Phyc. Germ: p. 256 (1845) ; Sp. Alg. p. 516 (1849) ; Tab. 



Phyc. VII. t. 35, f. 2 (1857). 



RABENHORST Dent-sen. Krypt. Fl. II, p. 196 (1847). 

 BRATJN in N. Denks. Schweiz. Ges. Naturw. X. p. 10 (1849); in 



Monatsb. Akad. Berl. for 1867, p. 889 (1868). 

 WALLMAN Forsok syst. Charac. p. 16 (1853) ; Transl. p. 14 (1856). 

 NORDSTEDT in Bot. Notiser, 1863, p. 39 (1863). 

 LEONHARDI in Verh. Naturf. ver. Briinn, II. p. 174 (1864). 

 WAHLSTEDT Mon. Sver. & Norg. Charac. p. 20 (1875). 

 MULLER in Bull. Soc. Bot. Geneve, II, p. 54 (1881). 

 BRAUN & NORDSTEDT Fragm. Mon. Charac. p. 78 (1882). 

 SYDOW Em-op. Charac. p. 31 (1882). 

 MIGULA Die Characeen, p. 190, f. 55-57 (1890) ; Syu. Charac. Europ. 



p. 49, f. 43-45 (1898). 



GROVES in Journ. Bot. XXXVI, p. 411, t. 392 (1898). 

 ERNST in Viert, Naturf. Ges. Zurich, XLIX, p. 64, t. 8 (1904). 

 PROSPER Carofit. Espan. p. 76, f. 13A (1910). 

 HY ia Bull. Soc. Bot. France, LX, Mem. 26, p. 19 (1913). 



EXSICCATA: Braun, Rab. & Stiz., 21, 31, 107; Desmazieres, II. 324; 

 Erbar. Critt. Ital., ii. 552; Groves, 53; Jack, Lein. & Stiz.. 205; 

 Nordstedt & Wahlst., 18; Rabenhorst, 31 (fide Sydow), 419; Wart- 

 mann & Scheiik, 250. 



Monoecious. Stem slender ; internodes 2-4 times the 

 length of the branchlets. Whorls of usually 8 primary 

 branchlets, with about double that number of shorter 

 and simpler secondary branchlets in two series, the 

 one above, the other below, the primary branchlets. 

 Primary branchlets 2-3 times furcate ; primary rays 

 usually -^-f the total length of the branchlet; secon- 

 dary rays 7-10 (of which 1-3 are usually simple); 

 tertiary rays 4-7, of which 1-2 are sometimes again 

 divided in 4-5 quaternary rays. Ultimate rays uni- 

 formly 2-celled, the lower cell gradually narrowing to 

 the base of the apical cell ; apical cell narrowly conical, 

 acute, c. 90-1 40 /x long, 30-45 /x, broad at its base. 

 Accessory branchlets usually one above and one below 

 each primary branchlet, those of the lower series once 



