32 BRITISH DESM1DTACE.E. 



strongly developed and very sharp. Pyrenoids five to 

 sixteen in each chloroplast. 



Zygospore globose and smooth. 



Length 162-288^; breadth G'8-10-8^; breadth of 

 apices 5'8-lG'o f i ; breadth just below apices 4 - 2-7'5 ^ ; 

 diam. zygosp. 21 /n. 



ENGLAND. Cumberland ! Westmoreland! (7>/x.sv//). 

 W., N., and E. Yorks ! Cheshire (%/). Cambridge ! 

 Kent! Surrey! Hants! (Roy). Devon! Cornwall! 

 (Marquand). 



WALES. Capel Cnrig (Cool-r tnul Will*} ; near 

 Dolbadarn Castle ; Bethesda ; Moelfre ; Yr Orsedd, 

 Carnarvonshire ! 



SCOTLAND. General ! (Roy $- 7>?.v.sW/). Common in 

 the Outer Hebrides ! Shetlands ! 



IRELAND. Generally distributed ! 



/ 



Geogr. Distribution. France. Germany. Norway. 

 Sweden. Faeroes. Italy. Austria. Poland. Green- 

 land. Spitsbergen. India. W. Africa. United States. 



This species is more generally distributed than (T. mono- 

 t&nium, from which it is readily distinguished by the form of 

 the cells. Although very long, the cells are somewhat fusi- 

 form and always attenuated towards the poles, which are 

 subcapitate. In G. monottenium the cells are quite cylindrical 

 and never attenuated towards the poles, which are slightly 

 wider than any other portion of the cell. 



Var. Iseve (Hilse) West & G. S. West, (PI. I, 



figs. 12-14.) 



Gonatozygon lieve Hilse, in Rabenh. Alg. 1867. no. 1892 ; West, Alg. N. 



Yorks. p. 291, t. 291, f. 6 (" G. Ixve n. sp."). 

 Gonatozygon Brebissonii var. Ixve (Hilse) West and G. S. West, Alg-a-fl. 



Yorks. 1901, p. 39. 



Cells 7-20 times longer than their diameter ; cell- 

 w r all smooth. 



Length 50-120 /< ; breadth 4'5-8'7 ( ; breadth of 

 apices 4'3-5'5ju. 



ENGLAND. Cocket Moss, near Giggleswick, and 

 Penyghent, W. Yorks! Mickle Fell, N. Yorks! Epping 

 Forest, Essex ! 



