STAUBASTRUM. 77 



Lappmark Siisswasseralgen, 1898, p. 54; Cumere, Desm. dc France 

 1901, p. 169, t. 12. f. 10 : Him.. Desm. Finnland, 19o:!, p. L':: : Cushman 

 in Rhodora, 1905. p. 204; Teodoresco, Alg. Roumania. I'.xiy, p. i 

 Borge, Botan. Xotiser, 1913, p. 50 ; Kaiser. Alg. Traunstriii. I'.M 4. p. i 



Asteroxanthium ramosum Kiitz. Spec. Alg. 1849, p. 184. 



Didymidium (Staurastrum)6pongiosumT&eiiisch,A]gevS.. Frank. LSiiT. p. 17.",. 



Staurastnnn megalonotum forma fiastata Schmidle, Beitr. \ln \lir Is 

 p. 35, t. 17, f. 6, 7. 



Cells rather under medium size, about as long as broad, 

 or a little longer, roughly circular in outline, deeplv 

 constricted, sinus narrow, sometimes almost linear : 

 semicells subsemicircular or subpyxamidate- truncate in 

 outline, basal angles obtuse and ending in a short 

 verrucose process ; about 8 or 10 emarginate processes 

 visible round the periphery, and 6 others forming a 

 curved series across the face of the semicell. Vertical 

 view triangular, sides usually slightly convex, angles 

 ending in a short verrucose process, each lateral margin 

 with 6 emarginate processes, and 3 similar pairs arranged 

 across each angle, decreasing in size towards the angles : 

 centre of apex smooth. 



Zygospore spherical, furnished with numerous spines 

 once or twice dichotomous at their apices (Lund.). 



Length 45-53 JJL ; breadth 42-50 JJL ; breadth of isth- 

 mus 12 jjt ; diani. zygosp., without processes, 56 n ; 

 length of processes 24 [i . 



ENGLAND. Cumberland ! Mickle Fell, Vorl 

 Warwicks (Wills). Surrey! Sussex (Ralfs). Hants 

 (Bennett). Devon ! Cornwall ! 



WALES.- -Bethesda !. Dolbadarn Castle I, Llyn Padara ! 

 and Capel Curig! (Cooke & Wills), Carnarvonshire. 

 Dolgelly, Merioneth (Ralfs). 



SCOTLAND.-- Sutherland, Boss, Inverness, Aberdeen. 

 Kincardine, Forfar !/ Perth!, Argyle and Stirling; 



(Roy ci 1 Biss.). 



IRELAND. Ballvnahinch, Galway ! Carrantuoh 

 Kerry! Adrigole, Co. Cork! Dublin and Wicklow 



(Arch.). 



Geogr. Distribution.- -France. Germany. 

 Galicia and Austria. Hungary. 

 Portugal. Norway. Sweden. Finland. Poland 



