164 A REVIEW OF THE BRITISH CHARACE.E. 



Tab. Pliyc, vii., t. 34, f. 2; Braun, Consp. Char. Europ., p. 2; 

 Braun, E. & S. Exs. 60, 74, 103 ; Nordst. & Wahlst. Exs. 41. 



Chara tenuissima, Desv. Journ. cle Bot. (1809), ii., p. 313 ; 



lieichenb. Icon. Bot., f. 1055-1068; Gant. Oesterr. Char., p. 10, 

 t. 1, f. 1 ; Bab. A. N. H., v. (1850), p. 85. 



C.fiexiiis, var. stellata, Walk. Ann. Bot. (1815), p. 178. 



C. stellata, S. F. Gray, Nat. Arr. Brit. PI. (1821), ii., p. 28 ? 



Stem very slender, internodes long. "Whorls very dense, of 

 5-8 short branchlets. Branchlets 2-3 times divided into 3-6 rays. 

 Ultimate rays 2-3-celled, the terminal cell very slender, acute. 

 Nucules oval, 8-9-striate ; spiral cells not prominent. Globule-; 

 large. Monoecious. (Tab. 209, f. 14.) 



The smallest British species, 1-4 in. high, usually dark green 

 and somewhat incrusted. Readily distinguished from our other 

 Nitellas by its very small dense whorls and comparatively long 

 mternodes. The nucules are ripe in August. It occurs in Central 

 and Southern Europe, Asia, North Africa and North America. 

 In Britain it has only been recorded from the Cambridgeshire 

 Fens, where it was discovered by Prof. Henslow in 1829. S. F. 

 Gray's description of C. stellata in 1821, could scarcely refer to any 

 other species, but no locality is given. 



ii. N. gracilis, Ag. Syst. Alg. (1824), p. 125; Coss. & Germ. 

 Atl. Fl. Par., t. 41 e ; Wallm. Act. Stockh., 1854, p. 247; Kutz. 

 lab. Phyc, vn., t. 34, f. l; Braun, Consp. Char. Em-op., p. 2 ; 

 Braun, E. & S. Exs. 24, 25, 34,* 57-59 ; Nordst. & Wahlst. Exs 

 15-17. 



* i St™ J!'' adlis> Sm ' El Bot - 214 ° ( 181 °) ; Beichenb. Icon. Bot. 

 ,\12X ; n a . nt ' 0esterr - Char., p. 10, t. 1, f. 2 ; Bab. A. N. H., v 



(1H50), p. 84. 



C.fiexiiis var. gracilis, S. F. Gray, Nat. Arr. Brit. PI. (1821), 



\oi. ii,, p. 28. 



£' t'f'\ 4 mici Des cnz. di alcune sp. nuove di Chara (1827), 

 p. zv, t. S, t. 6 and 7. 



Stem very slender, moderately branched. Whorls of 5-6 

 extremely slender branchlets. Branchlets 2-3 times divided into 

 tf-4 rays. Llhmate rays 2-3-celled, strongly mucronate. Nucules 

 solitary, at all the forkings of the branchlets, globosely ovoid, 6-7- 

 stnate. Monoecious. (Tab. 210, f. 15.) 



A very slender and delicate ' piant, 4-8 in. high, light green, 

 distinguished from the last by its much laxer habit! The nucules 

 are ripe in September. It was discovered by Mr. Borrer in a 



TJ!Fa P i° c ln , S ** Leoil ^l's Forest, and Vas described and 

 n urea, by bmith, from his specimens. It has since been collected 



Ti t * i ? n 'x at Glen Cullen > n ew Ballybetagh, Co. Dublin, 

 i ne Irish plant is a smaller, stouter form, and the ultimate rays 



re Shorter : smrl if io «,„,,, ,i,.„i„ • ,-,',, ... • -;i,J,- 



are shorter; and ,t is annularly incrusted. X. gracilis is widely 



> 



a me. 



