182 ENGLISH BOTANY. 



SPECIES IV.— N ITELLA MUCRONATA. Cosson & Germain. 



Plate 1902. 



Braun, Rabenh. & Stiz. Char. Europ. Exsicc. Nos. 17-20, 30. 



Nordst. & WaJdst. Char. Scand. Exsicc. No. 82. 



Nitella mucronata, Coss. & Germ. Fl. Envir. Par. ed. i. p. 683, and Atlas pi. 40, f. D ; 



ed. ii. p. 896 ; and Atlas pi. 46, f. e, 1-3. A. Braun, Consp. Char. Europ. p. 2 ; 



Schweiz. Char. p. 9 ; in Colin, Krypt. Fl. Schles. Vol. I. p. 398; and Fragm. 



Monog. Char. p. 50, t. i. f. 39-42. Nordst. in Anderss. Bot. Notiser, 1863. p. 36. 



Wallm. in Kongl. Vet. Akad. Handl. Stockh. 1854, p. 253. Kiitz. Phyc. Germ. 



p. 256 ; Sp. Alg. p. 514; Tab. Phyc. Vol. VII. p. 13, t. 33, f. i. WahJst. Monog. 



Sver. Norg. Char. p. 17. Crepin in Bull. Soc. Bot. Belg. Vol. II. p. 128. Leon- 



hardi in Brunn, Verhandl. Vol. II. p. 172. H. & J. Groves in Journ. Bot. 1S80, 



p. 165, t. 210, f. 16. Baling. Man. ed. 8, p. 469. Mutter in Bull. Soc. Bot. 



Geneve, 1881, p. 52. Sydow, Europ. Char. p. 22. 

 N. exilis, A. Braun, Schweiz. Char. p. 9. Kiitz. Sp. Alg. 515 ; and Tab. Phyc. Vol. VII. 



p. 13, t. 33, f. ii. (excluding syn. C. exilis, Amid). 

 N. flabellata, Kiitz. Phyc. Gener. p. 318 ; and Phyc. Germ. p. 256. Wallm. in Kongl. 



Vet. Handl. Stockh. p. 249. A. Braun in Colin, Krypt. Fl. Schles. Vol. I. p. 398. 

 N. Norvegica and N. longifurca, Wallm. in Kongl. Vet. Akacl. Handl. Stockh. 1854, 



p. 252. 

 Chara mucronata, A. Braun in Ann. Sciences Nat. 2nd ser. Vol. I. p. 351 ; and in 



Flora, 1835, Vol. I. p. 52. Bating, in Ann. Nat. Hist. 1850, Vol. V. p. 84. 



Gantercr, Osterr. Char. p. 9. 

 C. furcata, Amici, Descriz. Char. p. 14, t. v. f. 2, and t. 3, f. 2 (not of Boxb.). 

 C. Barbierii, Beds. Crivelli in Bibl. ltal. vol. 97, p. 190. 



C. flexilis, Beiclienb. Iconog. Vol. VIII. p. 38, t. 795, (not of other Authors). 

 C. flexilis, var. stellata, Wallr. Annus Bot. p. 178, t. vi. f. 1, 2. 

 C. longifurca, Bupr. in Beitr. zur Pflanz. des Buss. Beich. 1845, dritte liefr. p. 10. 

 C. brevicaulis, Bcrtol. Fl. Ital. X. p. 19. 



Monoecious. Green or olive. Stem rather slender, translucent, 

 without cortical cells or spine-cells or stipule-cells. Branchlets 

 4 to 8 in a whorl, slender, most of them 2 or 4 times bi- or tri- or 

 quadrifurcate ; the ultimate divisions shorter than the lower, often 

 of 2 cells and sharply mucronate ; those of the primary whorls 

 rather lax and with elongated segments ; those of the secondary 

 whorls similar or short, sometimes so much so as to give the ap- 

 pearance of forming heads. Nucules solitary, immediately below the 

 upper forks of the rays of the branchlets, subglobular-ovoid, 5- or 

 G-striate, with a minute deciduous crown. Globules solitary between 

 the forks of the branchlets, immediately above the nucules. 



In still water, very rare ; marsh ditch at West Grinstead, Sussex, 

 (Mr. Borrer) ; water-hole by the River Ouse, near Bedford (A. H. 

 Davies, and J. Saunders). 



England. Annual. Summer, Autumn. 



