COSMAEIUM. ]05 



truncately rounded. Side yievr of semicell slightly 

 narrower than front view. Vertical view very broadly 

 oblong-elliptic. Cell-wall minutely and indistinctly 

 punctate. Chloroplasts axile, one in each semicell, 

 each with two pyrenoids transversely disposed. 



Zygospore unknown. 



Length 58-75 /x; breadth 26'5-30*5 //,; breadth of 

 isthmus 20-29 p; thickness 24-26 p.. 



ENGLAND.- -Westmoreland! (Sissett). W. and X. 

 Yorks ! Gloucestershire (Rolfs). Middlesex! Surrey! 

 Devon ! 



WALES.- -Capel Curig, Carnarvonshire ! Dolgelly, 

 Merionethshire ! Swansea, Glamorganshire (Rolfs). 



SCOTLAND.- -Aberdeen, Kincardine, Forfar, Perth ! 

 (Roy cj- Bisseii). 



IRELAND.- -Loughs Aunierin and Derryclare, Galway ! 

 Suerarloaf Mountain and Carrantuohill, Kerry Dublin 



o / 



and Wicklow (Arrher). 



Geo<jr. Distribution.- -France. Germany. Austria 

 and Galicia. Hungary. Italy. Bornholm. Xorwav. 



o / / / 



Sweden. Finland. Poland. Russian Lapland. X. 

 and S. Russia. Franz Joseph Land. Xew Zealand. 

 Abyssinia. United States. 



C. Thwaitesii, although widely distributed,, is relatively a 

 rare species. We have only found isolated individuals among 

 submerged Sphagnum. 



Var. penioides Klebs. (PI. LXXIII, figs. 29, 30.) 



Cosmariuin Thwaitesii E-alfs b. penioides Klebs, Desm. Ostpreviss. 1ST'.', 

 p. 26, t. 3, f. 5-7 ; Borge, Chlor. Xorska Finmark. 1892, p. 11 'forma ; 

 Lutkem. Desm. Attersees, 1893, p. 555 ; Borge, Siissw. Chlor. Archang. 

 1894, p. 22. 



Cells stouter than in the type and proportionately 

 shorter, sides of semicells more coiiyex. 



Length 54-68 p. ; breadth 27-3 1 p.; breadth of 

 isthmus 22-26 p.. 



SCOTLAND. Xear Aberdeen ! 



Geoffr. Distribution. Germany. Austria. Sweden. 

 X. Russia. 



