622 CHAEACEAE 



Native. Lacustral. Ditches of brackish water, ponds, and canals. 



Very local and sporadic. June-July. 

 First found in Berkshire by the author in 1887. See Rep. Bot. Exch, 



Club (1891) 349, (1892) 395. 



1. Isis. Sparingly in a small pond on the south side of Wytham 



Hill, where I found it when botanizing with Mr. H. E. Garnsey. 



2. Ock. In 1891 it was very plentiful in a ditch of brackish water 



in the saline meadow near Marcham, where it occurred with 

 C. vulgaris. It was in the same situation in the following year, 

 and also occurred in considerable quantity along the margin of 

 the Wantage Canal between Marcham and Abingdon in 1892, 

 and less plentifully in 1893. 

 T. glotnerata is recorded for Hants only of the bordering counties. 



T. intricata, Leonh. in Lotos (1863) 32. 



Nitella intricata, Agardh, Syst. Alg. 125, p.p. Chara intricata, Roth, 

 Cat. fasc. ii. 125 (1800), 



Groves in Journ. Bot. (1880) t. 209, 163. Sj^me, E. B. xii. 187, t. 1907. 



Nyman, 878. 

 Native, Lacustral. Ditches and streams. Very local. July-Sep- 

 tember. Rare and not permanent in its localities. 

 First found in Berkshire by the author in 1893. 



2. Ock. In a ditch near South Hinksey in 1893 only. 

 T. intricata has been found in Oxfordshire and in Surrey. 



T. prolifera, Leonh. Lotos (1863), 57 nomen. 



Chara prolifera, A. Br. Ann Sc. Nat. i. (1834) 352. Nitella prolifera, 

 Kuetz, Phyc. Germ. 255 (18451. 

 Groves in Journ. Bot. 1. c. t. 209, f. 12. Syme, E. B. xii. 189, t. 1908. 

 Native. Margins of streams. Very rare. July- August. 

 First found in Berkshire by the author in 1896. 



2. Ock. In the Thames, on the Berkshire side of the stream, 

 between the University Boat House and Oxford. 



Discovered in Oxfordshire by my friend the Rev. G. R. Bullock- 

 Webster in the canal between Kidlington and Oxford in 1896 ; it was 

 owing to his finding this rare species in Oxfordshire that I gathered 

 it in Berkshire, as I made especial search for it in our canals and 

 streams. It was discovered in Northamptonshire by my friend 

 Mr. Dixon in 1894 in the canal near Yelvertoft. Perhaps it is from 

 this locality that we owe its introduction into both counties, as I am 

 pretty confident it was not in the canal between Oxford and Kidlington 

 in the eighties, having made very careful search of the water on many 

 occasions. 



The sporadic occurrence and inconstancy in the localities of this 

 genus is very remarkable and awaits a satisfactory explanation. 



