CHARACE/E. 161 



*Sub-species delicatuia, Braun. 



5. Ventongimps Moor, Rilstone. 



A considerable number of specimens of the two plants (C. fra- 

 gilis and C. delicatuia) have been examined by Mr. J. Groves 

 and Canon G. R. Bullock- Webster, and the characters which 

 separate them appear to them sufficiently important to warrant 

 their being treated as distinct species. Journ. Bot., 19 19, p. 69. 



C. fragifera, Durieu. 



7., Hayle Kimbro pond, Lizard road; Ruan Pool, 1920, Downes. 



Quarry pool, Lizard Downs, Marquand, 1920, B.E.C., 1920, 



p. 257. 

 8. "Hele Ager Marsh near Sennen" (Flora). Pond near Land's 



End, 1918, C. V. B. Marquand, B.E.C., 1918, p. 534. 



C. aspera, Willd. 

 7. Pool, Lizard Downs, 1920, Downes. 



C. vulgaris, Linn. 



4. Roadside pond, Tregorden near Egloshayle, 1918, Thurston. 



5. Carnkief pond, Perranzabuloe, Tresidder. 



7. Lizard, 1913, Vigurs. "Forma papillata, microptila et 

 brachy teles/' J. Groves, B.E.C., J913, p. 516. 



C. canescens, Lois. 



7. "Lizard peninsula" (Flora). Pool, Lizard Downs, 1917, 

 Marshall, W.E.C., 1917-18, p. 83; 1920. Downes. Small 

 quarry pool, Lizard, Marquand, B.E.C., 1920, p. 257. Kynance 

 Downs, Tresidder. 



Mr. J. Groves, who saw Mr. Marshall's specimens, writes : * I 

 have never seen a male specimen. It is wonderful how the 

 plant keeps going so well by parthenogenesis." Recently 

 found by Dr. Druce in the Orkneys. 



*Nite!la gracilis, Agardh 



Recorded in the Flora as almost certainly an error, but now 

 included. 



5. Pool in a marshy moor, Perranzabuloe, 1911, Rilstone, 

 R./.C., 79/3, p. 225. Mr. Rilstone reports that, whereas in 

 1911-12 it formed a dense mass in the pool, very little ap- 

 peared in 1913, since when he has not been able to find a 

 trace of it. Journ. Bot., 1918, p. 114. 



