■Cosinarhmi\ xi. desmidiacejs (West). 349 



Var. crispulum De Toni, Syll. Alg. 1042 ; W. efc G. 8. West 

 in Journ. Bot. 1897, p. 113. 



Euastrum suhlobaium Br6b. /3. crispulum Nordst. in Acta Univ. 

 Lund. ix. 10, t. i. f. 9 (1873). This variety is probably a Euasti-um. 



HuiLLA. — Inter Vti-iculariam, Morro de Lopollo ; April 1860. 

 No. 179 In paludibus exsiocandia ; April 1860. No. 176. 



3. C. retusiforme Gutw. in Bot. Central bl. xliii. 69 (1890) ; W. 

 et G. S. West, I.e. 



C. Hammeri Reinsch, var. retusiforme Wille in Vid.-Selsk. 

 Forhandl, Ghristiania, no. 11, 32, t. 1, f. 16 (1880). 

 HuiLLA. — lu paludibus exsiceandis ; April 1860. No. 176. 



4. C. retusum Rabenh. Fl. Europ. Alg. iii. 167 (1868) ; W. et 

 ■G. S. We.st, I.e. 



Euastrum retusum Perty in Mittheil. Naturforsch. Gesellsch., 

 JBern, 173 (1849); non KUtz. Phyc. Germ. 136 (1845). 

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



5. C. granatum Breb. in Ralfs, Brit. Desm. 96, t. xxxii. f. 6 

 .(1848) ; W. 6t G. S. West, I.e. 



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



We can now add West Central Africa to the distribution of this 

 species, and this, along with its habitats in East Africa and Madagascar, 

 still further confirms what Lagerheim has stated with regard to the 

 cosmopolitan nature of the species. 



6. C. angustatum Nordst. in Ofvers. K. Vet.-Akad. Fbrh. no. 6, 

 20 (1875) ; W. et G. S. West, I.e., p. 114. 



Euastrum binale var. angustatum Wittr. in Bih. t. K. Vet.-Akad. 

 Handl. Bd. 1, no. 1, 50, t. iv. f. 8 (1872). Euastrum polare 

 Nordst. in Ofv. K. Vet.-Akad. Fbrh. no. 6, 37, t. vii. f. 24 (1872), 

 A form with the vertical view oblong. 



HuiLLA. — In uliginosis editioribus prope Humpata, Empalanca et 

 Lopollo ; May 1860. No. 15. 



7. C. maximum W. et G. 8. West in Journ. Bot. 1897, p. 114. 

 C. obsoletum, (Hantzsch) Reinsch, subsp. maximum, Bbrg. in 



Vidensk. Medd. Naturh. Foren. Kjbben., 1890, 42, t. iv. f. 37 

 .(1891). 



Var. minor W. et G. S. West in Journ Bot. 1897, p. 114, 

 t. 367, f. 21. 



Htjilla. — Inter Utriculariam, Morro de Lopollo ; April 1860. 

 No. 179. 



C.palustre W. B. Turn, (in K. Sv. Vet.-Akad. Handl. Bd.xxv. No. 5, 

 60-1, t. viii. f. 65 and t. ix. f. 1) has some resemblance to this species^, 

 but is proportionately broader, has a much broader isthmus like that 

 of C. obsoletum, and the spines at the basal angles are strongly 

 convergent. 



8. C. Lundellii Delp. in Memor. Accad. Soi. Torino, ser. 2, xxx. 

 13, t. vii. f. 62-64 (1878). 



C. suhoircula/re W. B. Turn, in K. Sv. Vet.-Akad. Handl. Bd. 

 xxv. no. 5, 52, t. viii. f. 3 and t. ix. f. 27, 37 (1892). 



