Cl.oSTKK'irM. 101 



Ballynahineli, mid DerrycLire Lough, Oral way ! Tore 

 Mt. and Cromagloun, Kony ! Mourne Mis., Down ! 



i. Singapore. United States. 



Tin's species is probably nearest to 01. f/racilr. Breb., but is 

 inucli stouter with broader apices, which are truncate. It 

 sometimes occurs in immense quanlity amongst the leaves of 

 fflricularia minor, or in the jelly surrounding the filaments 

 of Batrachospermum raijtun. 



37. Closterium Balmacarense Turner. 

 (PI. XX, fig. 15.) 



Closterium Balwrtrin-piise Turn. Dosm. Notes, 1893, p. 347; Roy & Biss. 

 Scott. Dcsm. 1894, p. 243, t. 4, f. 6 ; Norclst. Index Dosm. 1896, p. 56. 



Cells of medium size, about 1 times longer than tlieir 

 diameter, slightly and regularly curved, outer margin 

 about 3 3 of arc (without apices), gradually attenuated, 

 apices dilated and rounded-truncate ; cell-wall smooth 

 and colourless ; chloroplasts with eight distinct ridges ; 

 pyrenoids ? 



Zygospore unknown. 



Length 31 5-322 /A; breadth 20-21 p.; breadth of 

 apices 10 /A. 



SCOTLAND. Balmacarra, Ross (A. IT. M7//.s). 



Forma minor Turner. (PI. XX, fig. 10.) 



Cl. Balmacarense $ minor Turn. Desm. Notes, 1893, p. 347 ; Eoy & Biss. 

 Scott. Desm. 1894, p. 244, t. 4, f. 7. 



Smaller than the type ; chloroplasts with six ridges. 

 Length 2(><)/x; breadth 10 p; breadth of apices 12 /M. 

 SCOTLAND. Balmacarra, Ross (A. IT. Wills). 



38. Closterium Scoticum Turner. 

 (PL XX, fig. 17.) 



Closterium Krotintm Turn. Dcsm. Notes, 1S93, p. 347; Roy &. Biss. Soott. 

 Dcsm. 1894, p. 248, t. 4, f . 8 ; Nordst. Index Desm. 189G, p. 23O. 



11 



