14 BRITISH DESMIDIACE.E. 



Desm. Attersees, 1893, p. 557 ; Roy & Biss. Scott. Desm. 1894, p. 44 ;. 

 Schmidle, Beitr. alp. Alg. 1895, p. 454 ; Nordst. Index Desm. 1896, p. 

 79 ; W. & G. S. West, Alg. S. England, 1897, p. 488 ; Schmidle, Lapp- 

 mark Sitsswasseralgen, 1898, p. 35 ; W. & G. S. West, Alga-fl. Yorks. 

 1900, p. 88 ; ? Him, Desm. Finland, 1903, p. 8 ; Larsen, Freshw. Alg. 

 E. Greenland, 1904, p. 84. 



C. anomalum Delp. Desm. subalp. 1877, p. 29, t. 9, f. 10-15 [in part]. 



0. conspersum a. Ralfsii Racib. Nonn. Desm. Polon. 1885, p. 75. 



Ut'sinella conspersa Kuntze, Revis. gen. plant. 1891, p. 924. 



Cells large, about 1-^ times as long as broad, deeply 

 constricted, sinus narrowly linear with a dilated 

 extremity ; semicells subrectangular, slightly wider at 

 the apex than at the base, angles slightly rounded, 

 sides almost straight, apex convex (in some specimens 

 much more than in others) ; cell- wall uniformly granu- 

 late, about 30 granules showing round the margin of 

 a semicell, granules disposed in about 9 horizontal 

 series and 13-15 vertical series, commonly with slight 

 irregularities. Side view of semicell almost circular. 



o 



Vertical view elliptic, ratio of axes about 1 : 1*6. 

 Chloroplasts axile, with two pyrenoids in each semicelL 



Zygospore unknown. 



Length 82-1 10 /x; breadth (max.) 65 77/x,; breadth 

 of isthmus 2027 p.; thickness 40-46 p.. 



ENGLAND.- -Westmoreland (Blssett). Malliam Tarn, 

 W. Yorks. Mickle and Great Shunnor Fells, N. Yorks ! 

 Suttoii Park, Warwickshire! ( Wills) . Sussex (Rolfs). 

 Keston Common, Kent ! 



WALES.- -Capel Curig (Cooke fy Wills), Bettws-y-Coed 

 (Ron), and near Bethesda !, Carnarvonshire. Llyn 

 Coron, Anglesey ! Dolgelly, Merionethshire (Rolfs). 



SCOTLAND.- -Grlen Tilt and Ben Lawers, Perth ! 



lRKLAND.--Clifden to Eoundstone, and Creggan 

 Lough, Galway ! Adrigole, Cork ! Dublin and 

 Wicklow (Archer). 



Geogr. Distribution.- -France. Germany. Austria. 

 Galicia. Roumania. Italy. Norway. Sweden. Born- 

 holm. Finland. Poland. N. Russia. Iceland. Nova 

 Zembla. Greenland. United States. Brazil. Paramiav. 



e 



Typical C, conspersum is a very uncommon Desmid. We 

 have seen no specimens exactly similar to the figure given by 

 Kalfs,, the apices being generally more convex and the con- 



