COSMA1UOJ. 57 



80. Cosmarium subquadratum Xordst. 

 (PL LXX, fig. 5.) 



Cosmarium subquadratum Xordst. Desm. Ital. 1876, p. 32, t. 12, f. 7 ; De 

 Toni, Syll. Alar- 1889, p. 968 ; Hansg-. in Sitzungsber. d. k. bfihm. Ges. d. 

 Wiss. 1892, p. 133 ; West & G. S. West, Alga-fl. Yorks. 1900, p. 90. 



Ursinella subquadrata Kuntze, Revis. gen. plant. 1891, p. 925. 



Cells of about medium size, about twice as lone as 



7 o 



broad, deeply constricted, sinus very narrow, slightly 

 dilated at the apex ; semicells subquadrate, sides 

 parallel for more than half way upwards, sometimes 

 very slightly upwardly divergent, or faintly retuse, 

 basal angles rectangular and a little obtuse, upper 

 angles widely and obliquely convex-truncate, apex 

 truncate or sometimes subretuse. Side view of semi- 

 cell ovate. Vertical view elliptic, ratio of axes about 

 1:1'5. Cell-wall finely and densely scrobiculate- 

 punctate. Chloroplast single, axile, and with a 

 central pyrenoid. 



Zygospore unknown. 



Length 5256 /t ; breadth 29-32 /< ; breadth of apex 

 about 8/<; breadth of isthmus 12-14^; thickness 19-22^. 



ENGLAND. Among various Algae on dripping rocks, 

 Insrleton, "W. Yorks ! 



o ' 



<-fi'u<ji'. Distribution. France. Italy. Brazil. 



81. Cosmarium quadratum Ralfs. 

 (PL LXX, figs. 68). 



'iii.i'lratinn Ralfs in Ann. Mag. Xat. Hist. 1844, p. 395, t. 11, 

 f . 9 ; Ralfs, Brit. Desm. 1848, p. 92, t. 15, f . la "fig-are incorrect, ; Kiitz. 

 Spec. Alg. 1849, p. 175; Arch, in Pritch. Iiifus. 1861, p. 731; Rabenh. 

 Flor. Europ. Algar. Ill, 1868. p. 162 ; Lxind. Desm. Suec. 1871, p. 47 ; 

 Wolle, Desm. U. S. 1884, p. 59, t. 18, f. 10 "figs. 8 and 9 ?] : O.oke, Brit. 

 Desm. 

 Heimei 



P- 



p. 723: Liitkem. Desm. Attersees, 1893, p. 555; Roy & Biss. 

 Desm. 1894, p. 173; Borge, Sverig. Chlorophy. II, 1895, p. 17 ; X..r<l.- 

 Inclex Desm. 1896, p. 217 ; West & G. S. West, Alg. S. England, l.v.i, . 

 p. 485 ; G. S. West. Alga-fl. Cambr. 1899, p. 114; West & G. S. W.-st, 

 Alga-fl. Yorks. 1900, p. 90; Alg. X. Ireland, 1902, p. 32; Freshw. Alg. 

 Orkneys and Shetlands, 1905, p. 22. 



