'Go8marium\ xi. DESMiDiACEiE (West). 349 



Var. crispulum De Toni, Syll. Alg. 1042 ; W. et G. S. West 

 in Journ. Bot. 1897, p. 113. 



Euastrunt suhlobatum Breb. y8. crispulum Nordst. in Acta Univ. 

 Lund. ix. 10, t. i. f. 9 (1873). This variety is probably a Euasti'um. 



HuiLLA. — Inter XJtrkulariain,, Morro de Lopollo ; April I860. 

 No. 179- In paludibus exsiccandis ; April 1860. No. 176. 



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

 ■et G. S. West, I.e. 



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

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

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



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

 G. S. West, I.e. 



Euastrum retusum Perty in Mittheil. Naturforsch. Gesellsch., 

 JBern, 173 (1849) ; non Kiitz. 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. et G. S. West, I.e. 



LiBONcio. — 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. Forh. no. 6, 

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



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

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

 Nordst. in Ofv. K. Vet.-Akad. Forh. 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 18(30. No. 15. 



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

 C. ohsoletum (Hantzsch) Eeinscli, subsp. maximum Borg. in 



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

 (1891). 



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

 t. 3G7, f. 21. 



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

 No. 179. 



C. pnlusfre 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. ohiiolptuiu, and the spines at the basal angles are strongly 

 convergent. 



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

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



C. subcirculare 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). 



