184 EXGLTSO BOTANY. 



In boggy pools and ditches, very rare. 



In St. Leonard's Forest, Sussex, found by Mr. Borrer, from which 

 station it was described by Smith. Messrs. Groves state that " it has 

 since been collected by Mr. D. Or, at Glen Cullen, near Ballybetagh, 

 co. Dublin," by Mr. Nicholson, at Kingston, Surrey ; and by 

 Mr. Beck with, in Shropshire. 



England, Ireland. Annual. Autumn. 



A very delicate plant, usually 3 to 6 inches long ; but the form 

 elongata of Braun, Rabenh. and Stiz. Char. No. 58 is more than a foot. 

 Rays of the primary whorls i to J inch long, much divided, with the 

 segments as delicate as the filaments of a Conferva ; secondary whorls 

 similar, but shorter. Sometimes, however, the plant has thicker stems 

 and branchlets, and the secondary whorls much denser, as in the form 

 bugellensis, Braun, Rabenh. and Stiz. Char. No. 25, which seems to me 

 to'come very near Nitella mucronata, var. 8. 17 of the same set, and to 

 be dissimilar to the typical and elongated states represented t>y Nos. 24, 

 57 and 58. I have seen neither English nor Irish specimens ; the 

 Irish is described by Messrs. Groves as a " smaller, stouter form, and 

 the ultimate rays are shorter, and it is annularly incrusted." Messrs. 

 Groves describe the nucules "as 6- or 7-striate," but those I have 

 examined have been mostly 7-striate. Coss. and Germ, say they are 

 with 4 or 5 strise, and that the fructification takes place in April and 

 May and in autumn. 



Slender Nitella. 



SPECIES VI.— N ITELLA TENUISSIMA. Kutzing. 



Plate 1904. 



Braun, Rabenh. & Stiz. Char. Europ. Exsicc. Nos. 60, 103. 



Nordst. & Wahlst. Char. Scand. Exsicc. No. 41. 



Nitella tenuissima, Kiitz. Phyc. Gener. p. 319 ; Phyc. Germ. p. 256 ; Sp. Alg. p. 515 ; 

 and Tab. Phyc. Vol. VII. p. 14, t. 34, f. ii. Coss. & Germ. Fl. Envir. Par. ed. i. 

 p. 683 ; and Atlas pi. 41, f. f ; ed. ii. p. 898 ; and Atlas pi. 47, f. g. Braun, 

 Consp. Char. Europ. p. 2; Schweiz. Char. p. 10; in Colin, Krypt. El. Schles. 

 Vol. I. p. 399 : and Fragm. Monog. Char. p. 62. Wallm. in Kongl. Vet. Akad. 

 Handl. Stockh. 1854, p. 246. Leonliardi in Brunn Verhandl. Vol. II. p. 169. 

 Walilst. Monog. Sver. Norg. Char. p. 19. H. & J. Groves in Journ. Bot. 1880, 

 p. 163, t. 209, f. 14. Baling. Man. ed. 8, p. 469. Midler in Bull. Bot. Geneve, 

 1881, p. 53. Sydow, Europ. Char. p. 28. Allen, Char. Amer. p. 13, pi. vi. 



N. hyalina, Agardh, Syst. Alg. 126 (teste Bab.). Non DC. 



Chara tenuissima, Desv. in Journ. de Botanique, 1809, Vol. II. p. 313. Loisel. Deslong. 

 Notice, p. 136. Bisclwff, Handb. Bot. Term, und Syst. t. 57, f. 2812. Ganterer, 

 Osterr. Char. p. 10, t. 1, f. i. Beichenb. Iconog. Vol. VIII. p. 36, t. 791, 792. 

 A. Braun in Flora, 1835, Vol. I. p. 53. Baking, in Ann. Nat. Hist. 1850, Vol. V. 

 p. 85. 



