Cosmarium] xi. desmidiace^ (West). 355 



Soc. 2nd ser. v. 61, t. vii. f. 21), but it is easily distinguished by its 

 shorter cells, its smaller size, its round (not triangular) scrobiculations 

 surrounding the granules, as well as its wider apex. 



This is the only species we know which has the two opposite sides 

 of the hexagons of scrobiculations surrounding each granule, horizon- 

 tally disposed. 



41. C. margaritatum Eoy & Biss. in Journ. Bot. xxiv. 194 

 (1886); Roy in Ann. Scott. Nat. Hist. 167, t. ii. f. 12 (1894). 



C. latum Breb. var. maryaritatum Lund, in Nova Acta R. Soc. 

 Sclent. Tips. ser. 3, viii. 26 (1871). 



Forma minor Boldt. in Bih. till Sv. Vet.-Akad. Handi. Bd. 13, 

 Afd. 3, no. 5, 26 (1888) ; W. et G. S. West in Journ. Bot. 1897, 

 p. 121. 



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



42. C. Portianum Arch, in Q. J. M. S. viii. 235-6, t. xi. f. 8, 9 

 (1860); in Pritch. Infus. 733 (1861); Rabenh. Fl. Europ. Alg. 

 iii. 160 (1868). 



Var. orthostiehum Schmidle in Bericht. Deutsch. Bot. Ges. Bd. 

 xi. Heft. 10, 549, t. xxviii. f. 7 (1893). Forma minor W. et G. 

 S. West in Journ. Bot. 1897, p. 121, t. 368, f. 9. 



LlBOXGO. — Ad margines fluni. Lifune ; Sept. 18.58. No. 204. 



This approaches C. nephroideum Roy & Biss. (in Ann. Scott. Nat. 

 Hist. 1804, 169, t. ii. f. 3), which seems to differ from C. Portianum. 

 var. iicphroideuin Wittr. both in its smaller size and in the regular 

 arrangement of its granules. 



43. C. trachycyrtum Reinsch, Contrib. Alg. et Fung. 83, t. xviii. 

 f. 1 (1875); W. et G. S. West in Journ. Bot. 1897, p. 121. 



HuiLLA. — Inter Porphyrosiphmiem NotarisH Kiitz. in udis sylvaticis 

 et apricis inter Monino et lac. Ivantala ; April 1860. No. 14. 



44. C. punctulatum Breb. in Mem. Soc. Sciences Nat. Cher- 

 bourg, iv. 129, 303, t. i. f. ] 6 (1856) ; Klebs in Schrift. phys.-okon. 

 GeselLsch. Kbnigsberg, xx. 37, t. iii. f. 50, 51 (1879) ; W. et G. S. 

 West I.e. 



HuiLLA.— In rivulis prope LopoUo ; May 1860. No. 187. 



Var. elongatum Klebs, I.e., t. iii. f. 53 ; W. et G. S. West in 

 Journ. Bot. 1897, p. 122. 



HuiLLA. — In uliginosis editioribus prope Humpata, Empalanca et 

 Lopollo ; May 1860. No. 15. 



45. C. concentricum W. B. Turn, in K. Sv. Vet.-Akad. Handl. 

 Bd. 25, no. 5, 62, t. ix. f. 11 (1893). 



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

 t. 368, f. 10. 



HuiLLA. — In uliginosis editioribus prope Humpata, Empalanca et 

 Lopollo ; May 1860. No. 15. 



46. C. Blyttii Wille in Vid.-Selsk. Forhandl. Christiania, no. 11, 

 25, t. i. f. 7 (1880); W. et G. S. West in Journ. Bot. 1897, 

 p. 122. 



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



