STAURASTRUM. 87 



processes, which are first directed obliquely outwards, 

 and then, at a point halfway along their length, they 

 are abruptly narrowed and directed obliquely upwards, 

 ending with truncate apices. Vertical view 3-6-radiate, 

 sides strongly concave, processes equal in length to about 

 half the diameter of the ' : body : ' of the cell. 



Zygospore oval or elliptical, smooth. 



Length, without processes, 14-15*5 ^ ; with processes, 

 17-26(ji; breadth with processes length with pro- 

 cesses ; breadth of isthmus 7-9 [i ; length zygosp. 16 JJL : 

 breadth ITSpt. 



ENGLAND.- -Thursley Common and Devil's Jumps, 

 Surrey ! New Forest, Hants ! Dartmoor and Woodbury 

 Common, Devon (Harris) ! Roughter Moor, Cornwall 

 (Marquand) ! 



WALES. Capel Curig, Carnarvonshire ! 



SCOTLAND. Sutherland !, Ross, Inverness, Moray, 

 Aberdeen, Kincardine, Forfar, Perth ! and Argyle (Boy 

 & Biss.). 



IRELAND. Donegal ! Mayo and Clare Isle ! Galway ! 

 Kerry ! Dublin and Wicklow (Arch.). 



Geocjr. Distribution. France. Belgium. Germany. 

 Galicia and Austria. Norway. Sweden. Finland. 

 Poland. N. Russia. Faeroes. " Siam. Azores. United 

 States. Colombia. Brazil. 



Borgeson has observed examples of this species in which the 

 cells were united to form short twisting filaments (see PL CXLII, 

 f. 8). 



Var. crassum Gay. (PL CXLI, fig. 8.) 



St. inconspicuum var. crassum Gay, Mono.loc. Conj. 1884, p. 68, t. 2, f. 1 

 De Toni, Syll. Alg. 1889, p. 1183 ; West & G. S. West, New Brit. Alg. 

 1894, p. 11 ; Comere, Desm. de France, 1901, p. 154. 



Processes stouter than in the type, distinctly jointed. 

 Length and breadth, including processes, 12-14 fj. ; 

 breadth of isthmus 6*5-7 JJL. 



IRELAND. Glen Caragh, Co. Kerry ! 

 Geogr. Distribution- -France. 



