TOLYPELLA 1NTRICATA. 133 



and graceful plant, the lower whorls separated by long inter- 

 nodes and composed of long slender conspicuously divided 

 branchlets. It is however often densely incrusted when in 

 its later stages it presents a particularly dilapidated appear- 

 ance. The large dense fruiting heads are perhaps more 

 conspicuously nest-like than in any other species, but the 

 " nests" are distinctly of the untidy order. The spiral-cells 

 secrete a lime-shell. The divided sterile branchlets readily 

 distinguish it from the other British species. 



It varies considerably in the extent of its branching, some- 

 times producing but one branch at a node at others a cluster 

 of branches. The number of adventitious branchlets is also 

 subject to great variation. 



2. Tolypella prolifera Leonhardi. 

 (PLATE XVIII.) 



Char a translucens var. prolifera WALLROTH Fl. Crypt. Gerin. II, p. 



106 (1833), fide Braun & Nordstedt, 



C. prolifera BRAUN in Ann. Sc. Nat. ser. 2, I, p. 352 (1834) ; in Flora, 

 XYIII, i, p. 56 (1835). 



C. nidifica BORRER in note to Engl. Bot. Suppl. t. 2762 (1834), non 

 Smith. 



Nitella prolifera KUTZING Phyc. Germ. p. 255 (1845). 



RABENHORST Deutsch. Krypt. Fl. II, p. 196 (1847). 



WALLMAN Forsok syst, Charac. p. 41 (1853) ; Transl. p. 35 (1856). 



CREPIN in Bull. Soc. Bot. Belg. II, p. 130 (1863). 



BRAUN Consp. Charac. europ. p. 3 (1867). 



MULLER in Bull. Soc. Bot. Genev. II, p. 55 (1881). 



N. fasciculata var. robustior (printed robust er) BRAUN in N. Denks. 

 ' Schweiz. Ges. Naturw. X, p. 12 (1849). 



KUTZING Sp. Alg. p. 517 (1849). 



C. Borreri BABINGTON in Ann. and Mag. Nat. Hist. ser. 2, V, p. 87 



(1850). 



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



(1856). 



N. intricata var. prolifera BREBISSON FL Normaiid, ed. 3, p. 384 (1859). 



BOSWELL Engl. Bot. ed. 3, XII, p. 189, t. 1908 (1884). 

 Tolypella prolifera LEONHARDI in Lotos, XIII, p. 57 (1863) ; in Yerh. 

 Naturf. ver. Briinn, II. pp. 158, 176 (1864). 



BRAUN in Cohn, Krypt, Fl. Schles. I, p. 401 (1876). 



GROVES in Journ. Bot, XYIII, p. 162. t. 209, f. 12 (1880). 



BRAUN & NORDSTEDT Fragm. Mon. Charac. p. 97 (1882). 



SYDOW Europ. Charac. p. 37 (1882). 



MIGULA Die Characeeii, p. 203, f. 59, 60 (1890) ; Syn. Charac. Europ. 

 p. 53. f. 47-48 (1898). 



HOLTZ Charac. in Krypt, Mark-Brandenb. IY, i. p. 79 (1903). 



HY in Bull. Soc. bot. France, LX, Mem. 26, p. 22 (1913). 



EXSICCATA : Rabenhorst, 68 ; Groves, 49-51. 



