('LOSTKIMI'M. 119 



24- 40 times longer tli;ni tlicir diameter, slightly cur veil 

 towards the extremities, median portion straight with 

 parallel sides, inner margin not tumid, gradually 

 attenuated towards the apices, which are obtusely 

 rounded; cell-wall smooth and colourless; each chloro- 

 plast with 8 or 9 pyrenoids ; terminal vacuoles with 

 several moving granules. 



o o 



Zygospore subglobose and smooth. 



Length 264-722 /m; breadth 11-20 /x,; diain. of 

 zygosp. 32 //,. 



ENGLAND. Enbridge Lake, Hants (Hoy). Near 

 Mullion, Cornwall ! 



"WALES. Capel Curig, Carnarvonshire ! 



SCOTLAND. Ross, Inverness, Aberdeen, Forfar, Perth 



IRELAND. Dublin and Wicklow 



G-eogr. .l)l^ti'ibntl<ni. France. Germany. Austria. 

 Norway. Faeroes. India. Japan. United States. 

 Brazil. 



7. Closterium angustatum Kiitz. 

 (PL XII, figs. 11-13.) 



Closterium att.ijustatum Kiitz, Phyc. germ. 1845, p. 132; Kalfs. Brit. 

 Desm. 1848, p. 172, t. 29, f . 4 ; Kiitz. Spec. Algar. 1849, p. 106 -, Arch. 

 ill Pritch. Infus. 1851, p. 74-9 ; Kabenh. Flor. Enrop. Algar. Ill, 18(iN, 



1893, p. 89, t. 3, f . 12 ; Koy ^ Hiss. Scott. Desm. 1894, p. 243 ; Nordst. 



Index Desm. 189(3, p. 45; West <-i. S. West, Alg-. S. England, 1897, 



p. 482 ; Alga-fi. Yorks. 19UO, p. 54 ; Alg. N. Ireland, 1902, p. 24. 

 Closterium speciosum Turn, in Trans. Leeds Nat. Clnb, 188(3, p. 10, t. 1, 



f. 17. 



Arthrodia angustata Knntze, Eevis. gen. plant. 1891, p. 883. 

 Closterium angustatum var. subrccla Schmide, Beitr. Alg. Schwarzwald. 



1893, p. 89, t. 3, f. 12. 

 Closterium. angustatum forma Eirhlcri Gutw. Wykaz Glonow Wadow.- 



Makow. 1897, p. 12 4. 

 Closterium anjustatum var. sjieciosum Schmidle, Lappmark Susswasser- 



algen, 1898, p. 13, t. 1, f. 10. 



Cells of medium size, 14-18 (sometimes only about 

 10) times longer than their diameter, moderately 

 curved, outer margin from 45 to 51 of arc, inner 



