180 BRITISH DESMIDIACE;K. 



Its nearest, ally is Cl. Rnlfsii Breh. var. Jii/lin'ihi in 

 from wliieli it differs in its greater eurvat mv, its !_;Teater 

 sleiiderness, especially towards the apices, and in its fewer 

 striae. 



o7. Closterium laterale Nordst. 

 (PL XXV, figs. 4, 5.) 



Closterium laterale Nordst. in Wittr. & Nordst. Alg. Exsic. 1880, no. 383; 



t;i.:.'. 21 , ISS9, p. 1(5 ; De Toni, Syll. Alg. 18S9, p. Sis ; G. S. West, Alg;i-il. 



Cambr. 1899, p. 112. 

 Afthrodia lateralis Kuntze, Revis. gen. plant. 1891, p. 883. 



Cells large, stout, 8-11 times longer than their 

 diameter, slightly curved, outer margin 4o-65 of arc, 

 inner margin broadly subtumid, gradually attenuated 

 to the apices, which are truncate or subtruncate ; cell- 

 wall finely striated, 45-(.>0 striae visible across the 

 cell, straw-coloured; chloroplasts with about ten ridges 

 and a single series of many pyrenoids in each ridge; 

 terminal vacuoles with about ten moving granules. 



Zygospore unknown. 



Length 284-5o-5/x; breadth 41-GO /x ; breadth of 

 apices 7-8 /x. 



ENULAND. Dernford Fen, near Shelford, Cambridge! 

 Tremethick Moor, Cornwall ! 



< li.'otif. Distribution. Brazil. 



58. Closterium Kiitzingii l>rel. 

 (PL XXV, figs. 6-11.) 



i-i-rux inlc i^in-d i inn Kitt/,. Spec. Aly. 184!), p. l(i(5. 

 Clnstcrinin- Kiitziiiiiii ISrt'b. Liste Desm. 1856, p. lob', t. 2, f. 10 ; Kirclm. 



Al--. Schk's. 1878, p. 1-1-1; Nordst. Alg. ot Char. 1, 1880, p. 1 ; Wollo, 



Desm. U.S. 1884, p. -1-7, t. 8, f. 8 Cooke, Brit. Desm. 1886, p. 31, t. 5, f. 3 ; 



Ilansi;-. 1'rodr. Algenfl. Bohni. 1888, p. 183; Nordst. Fivshw. Alg. N. 



/eal. ISSN. p. 70, t. 3, f. 20; Do Toni, Syll. Alg. ISSit, p. SoO; West, Al--. 



W. In-l;iii<l, 1S!(2, p. 125 ; Alg. Eng. Lake Distr. 1892, p. 720; Roy & 13iss. 



Scott. Dcsui. 1S!M, p. 215; Nordst. Index Desm. 18'Jti, p. 152; West & 



( i. S. West, Alg. S. England, 1897, p. 1-82 ; U. S. West, Variation Desm. 



1899; Alga-fl. Yorks. 1900, p. 57 ; Alg. N. Ireland, 1902, p. 21. 

 Cl. scliti'umii Ehrenb. b. intermedium Kabonh. Flor. Europ. Algar. Ill, 



isiis, p. 130. 



Cl. rust rat um Ehrenb. b. Kiitzimjii Klebs, Dosm. Ostpreuss. 1879, p. 18. 

 Arlhrodia Kiitxingii Kuutze, K'jvis. gen. plant. 1891, p. 883. 



