CHAEA 619 



CHAKACEAE, L. C Eich. in H. B. K. Nov. Gen. Amer. 



i. 45 (1805). 



CHARA, Linn. Gen. 1066 (Vaill. A. G. 17 19). 



C. fragilis, Desv. in Lois. Not. PI. de France, 137 (1810). 



C. capillacea, Thuillier, Fl. Par. 474 (1799). C. globularis, Thuill, I.e. 

 472 (nomen prius), Groves, H. & .J. in Journ. Bot. (1880) t. 207, loi, 



Syme, E. B. xii. 213, t. 1920. Nyman, 874. Fl. Oxf. 365. 



Native. Lacustral. Ditches, brooks, ponds, canals, and rivers. Locally 

 abundant and widely distributed. June-August. 



First recorded by the author in Rep. Boi. Bee. Club, 1885, and in Fl. Oxf. 

 365. See also Journ. Bot. (1885) 81. 



Typical C. fragilis is rather rare in the county. It has been noticed 

 at Cothill, near Uffington, at Aldermaston, near Hurst, and in 

 Virginia Water. Our more frequent plant is var. Hedwtcgii 

 (Agardh in Bruzel Obs. Char. 7 & 21, as a species). Groves, 1. c. 



1. Isis. In the Thames and its ditches between Eynsham and 



Godstow, in some places forming dense masses of vegetation, 

 but not often found in equal quantity in two consecutive years. 

 In the canal at Shrivenham. 



2. Ock. Near Ferry Hinksey and Soutli Hinksey, in great quantity. 



See Journ. Bot. (1887) 146. Occasionally in the river between 

 Oxford and Wallingford. Plentiful in the canal between 

 Abingdon and Wantage. Between Wantage and Uffington. 

 Near Marcham. 



3. Pang. In the Thames near Moulsford, and here and there 



between Wallingford and Reading. In a pond near Unwell 

 Wood. 



4. Kennet. Plentiful in ditches below Burghfield Bridge, Tufnail. 



In the canal at Aldermaston and Hampstead Marshall. In the 

 Kennet near Newbury. In a pond near West Usley. 



5. Loddon. In the Thames near Sonning. Near Old Windsor. 



Virginia Water. 



A form approaching to var. capillacea, Coss. et Germ., occurred in 

 a pond near Hurst. 



C. fragilis is recorded for all the bordering counties except East 

 Gloucestershire. 



[C. coNNivENS, A. Br. in Flora, 1835, ^ 7i' Syme, E. B, xii. 215, t. 1921. 

 Is recorded from Hants.] 



C. contraria, A. Br, in Kuetz, Phyc. Germ. 258 (1845). 



C. foetida, var. contraria, Coss. et Germ. Fl. Env. Par. ed. 2, 890. 

 H. & J. Groves, Journ. Bot. (1881) t. 224, 354. Syme, E. B. xii. 204, 

 t. 1915. Nyman, 875. Fl. Oxf. 366. 



