356 XI. DESMiDiACEiE (West). [Cosma/rium 



47. C. subcostatum Nordst. in Ofv. K. Vet.-Akad. Forb. no. 6, 

 37-8, t. xii. f. 13 (1876). 



Fwma minor W. et G. S. West in Journ. Bot. xxxiv. 379, t. 

 361, f. 15 (1896); xxxv. 122 (1897). 



Mossamp:des. — Inter Charas in rivo Caroca pr. Cabo negro ; Sept. 

 1859. No. 19. 



48. C. alatum Kirchn. in Cohn, Kryptogamen-flora von 

 Schlesien, Zweit. Bd., 153 (1878) ; W. et G. S. West in Journ. 

 Bot. 1897, p. 122. 



Loan DA.— In stagnis (Represa de Luiz Gomes) ; Feb. 1858. No. 136. 

 LiBONGO. — Ad margines flum. Lifune ; Sept. 1858. No. 204. 



Var. suboblongum W. et G. S. West in Journ. Bot. 1897, p. 122. 

 PuN(io Andongo. — Adramulos Podostemacearum in rivulis Praesidii 

 (Casalale) ; March 1857. No. 105. 



49. C. subtriordinatum W. et G. S. West in Journ. Bot. 1897, 

 p. 122, t. 368, f. 11. 



PuNc;o Andongo. — In stagnis prope Anbilla (Condo) ; March 1857. 

 No. 177. 



The nearest species to this is C. trlordhiatum W. et G. S..West (in 

 Trans. Linn. Soc. ser. 2, v. 66, t. vii. f. 27), from which it differs in its 

 less wide cells, its rounded and not acute granules, its smooth apex, 

 and in its quadrate (not rounded) and fewer central warts. 



50. C. callistum W. et G. S. West in Journ. Bot. 1897, p. 172, 

 t. 367, f. 13. 



PuNGo Andongo. — In stagnis prope Anbilla (Condo) ; March 1857. 

 No. 177. 



51. C. colonophorum W. et G. S. West in Journ. Bot. 1897,. 

 p. 172, t. 367, f. 1. 



Htjili.a. — In paludibus exsiccandis ; April 1860. No. 176. 



This is a noteworthy species, the large size of the warts and their 

 arrangement easily distinguishing it from any other ; the four median 

 ■warts on each side of the vertical view being especially pronounced. 



52. C. bilunatum W. et G. S. West in Journ. Bot. 1897, p. 173, 

 t. 367, f. 17. 



HuiLLA. — In uliginosis editioribus prope Humpata, Empalanca et 

 Lopollo ; May 1860. No. 15. 



This characteristic species is nearest in outline to C. prcecehum W. B. 

 Turn, and C. huUcum W. B. Turn. 



53. C. mueronatum W. et G. S. West in Journ. Bot. 1897, 

 p. 173, t. 367, f. 16. 



HuiLLA. — In paludibus exsiccandis ; April 1860. No. 176. Inter 

 Utrkulanam, Morro de Lopollo ; April 1860. No. 179. 



This species is distinguished from C. pseudolaxichondrum Nordst. by 

 its rounded semi-cells, by the complete absence of granules, and by the 

 oblong vertical view. 



54. C. pseudotaxichondrum Nordst in Ofvers K. Vet.-Akad. 

 Forh. no. 3, 20, t. ii. f. 5 (1877). 



