66 BRITISH CHAROPHYTA. 



C. capillacea Wallman Forsok syst. Charac. p. 102 (1853) ; TransL 



p. 85 (1856), non Thuillier, /de Braun. 

 C.fragilis var. deticatula Leonhaedi in Verh. Naturf. vev. Briiim, II,. 



p. 209 (1864). 

 Beaun Consp. Chai-. Euvop. p. 7 (1867). 

 C.fragilisYa,rs. pidcliella and IndhiUfera Lange in Fl. Dan. 2796, 1, iind 



2798, 1 (1869). 

 C. fragilis subsp. delicatula Beatjn & Noedstedt Fragmente, p. 184,. 



t. 7, f. 269-270 (1882). 

 C.fragilis ser. ilfacropiiZa Peospbe, Carofit. de Espari. p. 169 (1910). 

 C.fragilis var. capillacea Ht in Bull. Soc. Bot. France, LX, Mem. 26,. 



p. 43 (1918). 



ExsiccATA : — Areschong 140 ; Braun, Rabenh. & Stiz. 75, 100, 115 ;. 

 Desmazieres II, 330 ; Groves 2 ; Hansen 1298 ; Kiypt. Exsicc. 738, 

 739 ; Migula, Syd. & Wahlst. 24 ; Nordstedt & Wahlst. 119, 120 ; Gr. 



6 B.-W. 41. 



MoncEcious. Stem slender (diam. c. 375-500 a) ; 

 internodes usually but little longer than the branchlets, 

 but occasionally even more than twice as long. Cortex 

 regular, the cells of the secondary little more than half 

 the diameter of those of the primary series ; spine-cells- 

 papilUform or rarely elongated. Whorls of usually 



7 branchlets. Stipulodes of the upper series + developed 

 but often very short, of the lower usually rudimentary. 

 Branchlets about 225-325 [i in diameter, usually curved, 

 of 9-11 segments, the upper 1-3 ecorticate. Bract-celh 

 normally 7, occasionally 5, the anterior pair only 

 developed, usually acuminate, from one-half the length 

 of, to equalling that of, the fruit ; hracteoles almost 

 always exceeding the fruit. Oogonia and antheridia 

 solitary, produced usually at the 3 lowest branchlet- 

 nodes. Oogonium c. 750-1000 y. long (excl. cor.), 500- 

 675 [L broad ; spiral-cells showing 14-15 convolutions ; 

 coronula very variable in height, c. 250 \). broad at the 

 base, usually connivent, occasionally straight. Oospore- 

 ellipsoid, c. 625-700 [x long, 350-475 [i broad, black, show- 

 ing 12-14 thin ridges, terminating in basal claws ; oiUer 

 membrane thick, laminated, semi-rigid, semi-opaque, 

 nearly black, granulated with weU-delined granules of 

 varying sizes. Antheridium -^ c. 450 ^ in diameter. 



Habitat. — In ponds, pools, lakes and streams,, 

 common especially in moorland districts. 



