NITELLA TRANSLUCKNS. Ill 



Beaun & NoRDSTBDT Fragm. Mon. Charac. p. 49 (1882). 



Stbow Europ. Charac. p. 19 (1882). 



BoswELL Engl. Bot. ed. 3, XII, p. 180, t. 1901 (1884). 



MiGULA Die Charaoeen, p. 140, f. 39, 40 (1890) ; Syn. Charac. Europ. 



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

 WiLLB in Engler & Prantl., Nat. Pfl. Fam. I, 2, p. 173, f. 127 (1891). 

 Green F1. Liverpool, f. 802 (1902). 

 Prosper Carofit. Espafi. p. 68, f. 11a (1910). 

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



Exsiccata:— Areschoug, 247; Billot, 2993; Brann, Rabenh. & 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 ; Wesl:endorp & Wall. 1095. 



Monoecious. Stem stoiit; iidernodes usually 1-|~3 

 times the length of the branchlets. Sterile whorls of 

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

 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 

 ■lohorls 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 /x long, 400-425 yx broad; 

 spiral cells showing 7-8 convolutions ; apex of spirals 

 not swelling; coromda 40-45 /x high, persistent. 

 Oospore c. 326-350 /x long, 250-300 jx broad, 225 jx 

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

 minent thin ridges ; outer mernbrane thin, flexible, 

 and translucent, yellow-brown, minutely reticulate 

 (PI. IV, f. 10). Antheridium c. 250-375 fi 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, B., Staffs, Salop, Cheshire, Cumberland. 



Wales : Anglesey. 



Scotland: Dumfries, Kircudbright, Wigtown, and 

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



