166 A REVIEW OF THE BRITISH CHARACEJE. 



Suffolk, E.; Norfolk, E.; Salop; Cheshire; Kerry; Gal way, W.; 

 Derry, W. 



§§ Ultimate rays 1-celled. 



FLEXILIS 



, Ag. Syst. Alg. (1824), p. 124; Wallm. Act. 



btockh., 1854, p. 261 ; Kiitz. Tab. Phyc, vii., t. 33, f. 2 ; Braun, 

 Consp. Char. Europ., p, 2; Braun, B. & S. Exs. 22, 23, 54, 55, 

 101 ; Nordst. & Wahlst. Exs. 8-14. 



Cham flexilis, L. Spec. Plant. (1753), p. 1157 (ex parte); 

 Bruzel. Obs. Char., pp. 15 and 23; Gant. Oesterr. Char., p. 8; 

 Bab. A. N. H., v. (1850), p. 83. 



C.fureulata, Beichenb. Mossl. Handb., ed. 3, vol. iii. (1834), 

 p. 1664. v /' 



„ n c \ Bro !l»i ( »ti«n«, Coss., Germ. & Wedd. Introd. Flor. Par. 

 (1842), p. 152. 



Nitella Brogmartiana, Coss. & Germ. Flor. Par. (1845), p. 682, 

 andAtl. 40 c. v fV 



Chora commutata, Bupr. Symb. ad Hist. pi. Boss. (1845), p. 77. 



Nitella furculata, Nordst. Bot. Notiser, 1863, p. 35. 



Stem rather slender. Branchlets slightly incurved, 6-8 in a 

 whorl, once divided into 2-3 long, somewhat acute, 1-celled rays. 

 J! ertile whorls usually lax. Nucules 2-3 together, shortly oval, 

 8-9-stnate. Globules large. Monoecious. (Tab. 210, f. 18.) 



hx its typical form, slender, flexible, light green, and often 

 annular y mcrusted, 1-3 ft. high. The fertile whorls rarely form 

 lax heads, when it is /. mbcapitata, Braun. It is only recorded 

 trom Europe and America, and is not common in Britain. 



r"onds and pools. June and July. Sussex, W. ; Kent, W. ; 

 Surrey; Essex, S. and N.; Herts; Cambridge; Warwick; 

 York, N.E. ; Northumberland, S. 



vi. N. opaca Ag. Syst. Alg. (1824), p. 124; Braun, Consp. 

 Chai-Europ pi; Braun, B. & S. Exs. 29, 51-3, 77, 105-6; 

 Nordst. & Wahlst. Exs. 5-7. 



Charafiexilis, "L." Sm. E. B., 1070 (1802). 



C synearpa, Auct. (non Thuill.), Beichenb. Icon. Bot., f. 1078-9 ; 

 Gant. Oesterr. Char., p. 9; Bab. A. N. H., 1850, v., p. 83. 

 ^ t. fiexdu, var. prolifera, S. E. Gray, Nat. Air. Brit. PI. (1821), 



C. opaca, Ag. in Bruzel. Obs. Char. (1824), pp. 16 and 23. 

 U capitata, var. opaca, Braun, Ann. Sc. Nat., 1834, p. 852. 



Par lto£ arPa i5l t ' S '" MU ' C ° SS * Germ< * Wedd ' Intr ° d ' F1 ° r ' 

 N. atrovirm* & opaca, Wallm. Act. Stockh., 1854, p. 263-4. 

 Stem rather slender. Barren whorls of 6-7 simple, or 2-3- 

 rayed branchlets. Fertile whorls forming dense heads (in the 

 male plant often much laxer) ; branchlets once divided into 2-3 

 (rarely m the male plant 4), acute rays. Nucules 1-3 on each 

 branchlet, strongly ; 6-striate. Globuies very large, solitary. 

 Dioecious. (Tab. 210, fig. 19.) J & > 



This is a very variable species ; it may usually be distinguished 

 by the dense heads, and its ultimately becoming almost black, as 



