|S|- IM.'lTtSH DKSMIDIAC'E.E. 



West, Alg. W. Ireland, 1892, p. 121 : Alg. Eng. Lake Dislr. 1892. p. 72U : 

 WestA:<;. S. \Vcsl, Desm. Singapore, 1897, p. !">! lindus. forma major); 

 Alg. S. England, 1897, p. 482 Some Desm. U.S. 18<ts,p. 284 ; Chlorophy. 

 Koli Chang, 1901, p. 166; Fresh w. Alg. Ceylon, r.HrJ, p. L38. 

 CJ. litiful ii.tn Ehrenb. var. .sf<//<'r/Vr/<.s.' Xordst. Alg. aq. dulc. et Char. 

 Sand vie. 1878, p. 9, t. 1, f. 10-12 ; Freshw. Alg. N. Zeal. 188S, p. (is ; 

 Borge, Siissw. Chlor. Archang. 1894, p. 15. 



Cells longer than in the type, 12-18 times longer 

 than their diameter, somewhat variable in size, vent nil 

 inflation less prominent, apices subtruncate ; 23-34 

 stride visible across the cell. 



Zygospore double, each part ovoid-globose, smooth 

 and thick- walled. 



Length 306-700 /i; breadth 24-44 p; breadth of 

 apices 6-1 1 '5 /A; diam. zygosp. 56*5-80 p. 



ENGLAND. Near Bowness, and Longhrigg, ^Wst- 

 moreland ! Hawkshead, Lancashire ! Puttenham and 

 r rimrsley Commons, Surrey ! New Forest, Hants. 

 (with zygosp.) ! 



ICELAND. Lough Aunierin, Glalway ! Cromagioun, 

 Kerry ! 



Geogr. Distribution. Bohemia in Austria. Sweden. 

 N. Russia. Ceylon. Siam. Singapore. New Zealand. 

 Australia. Sandwich Is. United States. 



Tliis variety is widely distributed in many parts of the world 

 ami exhibits considerable variation. It is more tumid in the 

 ventral imirgin, more attenuated towards the extremities,, and 

 more finely striated than 67. lineatum Khivnb. It resemMes 

 very closely Gl. decorum Breb., and should be carefully com- 

 pared with that species. 



(). Closterium decorum Breb. 

 (PI. XVII, figs. 7, 8 ; PL XXVIII, figs. 1-3.) 



decorum l!ivl>. Liste Desm. 1830, p. 151, t. 2, f. 39; Arch, in 



1'i-itcli. lufus. 18(il, p. 74.'J ; Kabeiih. Flor. Eurup. Alg;w. III, 18ii8. 



p. 1:57 ; Kirehu. Alg. Schles. 1878, p. 13U ; ? Woll<>. lcsm. U.S. 188-i, 



p. 4=3, t. 7, f. 1; Hansg. Prudr. Algeufl. liohm. 1888, p. 181; Nun 1st. 



Fi-eliw. Alg. N. Zeal. 1888, p. 67 ; De Toni, Syll. Alg. 1889, p. 8:;;, ; 



Roy \ Bias. Scott. Desm. 1894', p. 244 ; Nordst. Index Desm. 189G, p. 98 ; 



West & a. S. West, Alga-fl. Yorks. 1900, p. 51. 

 Cl. crassum Delp. Desm. subalp. 1877, p. 121,118,122-30; Hansg. Prodr. 



AlgiMiH. lirihin. 18SS, p. iso. This is not Cl. ci-ngmnn Italn-nh. 18(i3.] 

 !. A'.I/./SI'I Un'-h. ;i. ticli><itci Klebs, Desm. Ostprenss. 1879, p. 17, t. 2, 



f . 5 it, 5 c, G a. 



