136 BRITISH CHAROPHYTA. 



LANGE in Fl. Danica, t. 2800 (1869). 



BOSWELL Engl. Bot. ed. 3, XII, p. 185, t. 1905-6 (1884). 

 C. glomerulifera RUPKECHT Symb. Hist. PI. Ross, p. 75 (1845). 

 N. glomerulifera WALLJVIAN Forsok syst. Charac. p. 42 (1853) ; Transl. 



p. 36 (1856). 



C. Smithii and C. prolifcra BABINGTON in Ann. & Mag. Nat. Hist. ser. 

 2, Y, pp. 86-7 (1850). 



JOHNSON Fern Allies, p. 44-45, t. 26 (1855). 

 N. Smithii WALLMAN Forsok syst. Charac. p. 43 (1853) ; Transl. p. 36 



(1856). 



Tolypella glomerata LEONHARDI in Lotos, XIII, p. 57 (1863) ; in Verh. 

 naturf. ver. Briinn, II, p. 176 (1864). 



WAHLSTEDT Mon. Sver. & Norg. Charac. p. 22 (1875). 



GEOVES in Jonrii. Bot. XVIII, p. 162, t. 209, f. 11 (1880). 



BRAUN & NORDSTEDT Fragm. Mon. Charac. p. 95 (1882). 



SYDOW Europ. Charac, p. 35 (1882). 



MIGULA Die Characeen, p. 227, f. 64 (1890) ; Syn. Charac. Europ. p. 

 58, f. 52 (1898). 



HOLTZ Charac. in Krypt Mark-Brandenb. IV, i, p. 82 (1903). 



PROSPER Carofit. Espafi. p. 80, f. 13B (1910). 



HY in Bull. Soc. hot. France, LX, Mem. 26, p. 20 (1913). 



EXSICCATA : Areschoug 395; Braun, Rabenh., & Stiz. 17; Des- 

 niazieres II, 326 ; Fries XVI ; Groves, 47, 48 ; Migula, Sydow, & Wahlst. 

 128 ; Nielsen 12 & (fide Wahlstedt) 13 ; Nordstedt & Wahlst. 43-45 ; 

 Rabenhorst 459 (fide Sydow). 



Monoecious. Stem slender to moderately stout ; 

 branches usually 2-6 at a node. Sterile whorls of 

 6-1 2 elongated simple 3-5-celled branchlets, the ulti- 

 mate cell more or less elongated and cylindrical, 

 obtuse. Fertile wlwrls usually in dense compound 

 heads of once-forked branchlets. Rays 4-5, unequal, 

 often tapering, usually strongly curved, the central 

 ray much the longest, the lateral usually 3 -celled, the 

 central 3-4-celled ; ultimate cell cylindrical obtuse. 

 Oogonia and antheridia produced at the nodes of the 

 branchlets, and oogonia sometimes in great number also 

 at their base. Oogonia usually 2-6 together, often 

 stalked, ellipsoidal, 1 c. 425-500 p. long, 310-375 /x, 

 broad; spiral cells showing about 9-10 convolutions, 

 usually swelling at the apex; coronula 35-50 ^ high, 

 65-90 p broad, usually deciduous. Oospore usually 

 ellipsoidal, yellow to orange-brown or cold dull brown, 

 c. 300-375 //, long, 250-300 p. broad, showing 7-9 

 thin, low ridges ; outer membrane thick and semi-rigid, 



