XITELLA TRANSLUCENS. Ill 







BRAUN & XORDSTEDT Fragni. Mon. Charae. p. 49 (1882). 



SYCOW Europ. Charae. p. 19 (1882). 



BOSWELL Entfl. Bot. ed. 3, XII, p. 180, t. 1901 (1884). 



MIGULA Die Characeeii, p. 140, f. 39, 40 (1890) ; Syn. Charae. Europ. 



p. 36, f. 27, 28 (1898). 



WILLE in Engler & Prantl., Xat, Pfl. Fain. I, 2, p. 173. f. 127 (1891). 

 GREEN Fl. Liverpool, f. 802 (1902). 

 PROSPER Carofit. Espan. p. 68. f. HA (1910). 

 HY in Bull. Soc. Bot. France, LX, Mem. 26, p. 11 (1913). 



EXSICCATA : Areschoug, 247; Billot. 2993 ; Braun, Babenh. &. Stiz., 

 19 ; Desmazieres, II. 317 ; Erbar. Critt, Ital., 451 ; Fries. XVI ; 

 Groves, 25, 58 ; Lloyd, 405 ; Migula, Sydow & Wahlstedt. 76 : Nielsen, 

 7 (fide.Wahlst.) ; Nordstedt & Wahlstedt, 81 ; Westendorp & Wall. 1095. 



Monoecious. Stem stout; iniernodes usually 1-^-3 

 times the length of the branchlets. Sterile whorls of 

 4-7, usually stout, once-forked branchlets; primanj 

 rays very long ; secondary rays minute, usually 2-4, 

 but sometimes solitary, strongly acuminate, of unequal 

 length, one usually double the length of the others, 

 2-celled, the upper cell conical acuminate. Fertile 

 whorls usually small and close together, often forming- 

 large dense heads; branchlets about 6, slender, forked, 

 with 3-6 rays, of which 1-2 are sometimes again 

 forked ; ultimate rays 2-celled, the lower cell narrow- 

 ing gradually to the acute apical cell. Oogonia, 2-4 

 together, c. 475-525 ^ long, 400-425 //, broad; 

 spiral cells showing 7-8 convolutions; apex of spirals 

 not swelling ; coronula 40-45 JJL high, persistent. 

 Oospore c. 325-350 //, long, 250-300 p broad, 225 p, 

 thick, light golden-brown, showing about 6 very pro- 

 minent thin ridges ; outer membrane thin, flexible, 

 and translucent, yellow-brown, minutely reticulate 

 (PI. IV, f. 10). Antheridium c. 250-375 p, in diameter. 



HABITAT. In lakes and ponds and occasionally in 

 running water ; not very common. 



DISTRIBUTION.- -England : Cornwall, "W. &E., Devon, 

 S., Somerset, N., Dorset, Hants, S., Sussex, W., Surrey, 

 Essex, S., Herts, Middlesex, Berks, Bucks, Suffolk, 

 E., Norfolk, E., Staffs, Salop, Cheshire, Cumberland. 



Wales : Anglesey. 



Scotland : Dumfries, Kircudbright, Wigtown, and 

 Fife (fide Boswell), Stirling, Perth, W., M., & E., 



