238 ANNALS OF SCOTTISH NATURAL HISTORY 



52. S. franconicum, Reinsch. Very rare. Aberdeen Bishop's 



Loch and Tomachar. 



53. S. furcatum (Ehr.) Breb. (including St. spinosum, Ralfs.) 



General. 



54. S. furdgerum, Breb. General. Conjugated in a marsh south 



of the Ord, near Dinner, Aberdeen. The zygospore is 

 exactly like that of S. armigerum in size and appearance. 

 Unfortunately the specimen was lost. 



55. S. glabrum, Ehr. Common. 



56. S. gracile, Ralfs. Not common. Sutherland, Ross, Inverness, 



Aberdeen, Kincardine, Forfar, Perth, Argyle, Fife. 



/3 bicorne, Bulnh. Rare. Aberdeen Upper Powlair, 

 Slewdrum, Birsemore Loch, Craigendinnie, Heugh- 

 head, west of the Ord, near Loch Dawan, Homehead, 

 Birkhill, Mosston Moor; Kincardine Scolty Dam 

 and Dalbrake ; Perth Folotry in Fowlis Wester. 

 y tenuissima, Boldt. Rare. Inverness in Skye, and at 

 Brin ; Aberdeen at Haughton, and in Glen Clunie ; 

 Kincardine Crathes and Glen Dye; Perth Glen 

 Garry. 



57. S. grande, Bulnh. Very rare. Perth near Loch Mharc in the 



Forest of Athole, where it was found in July 1876, and in- 

 cluded in a list of Perthshire species, published in the " Scot. 

 Nat," April 1877. 



58. S. granulosum, Kg. Rare. Ross near Tain; Aberdeen 



marshes south of Birsemore ; Kincardine Cammie, Heugh- 

 head, and Dalbrake (with zygospores), in Strachan. Zygo- 

 spore globular, with numerous slightly bifid spines. Diameter 

 without spines, 28 /A; length of spine, io/*. (Our Plate III., 

 fig. 6.) 



59. S. Heimcrliamtm, Liitkem. 



/3 spinulosum, Liitkem. Rare, or overlooked. Aberdeen 

 Upper Powlair in Birse ; Kincardine pool by the 

 Spital Burn, Strachan. 



60. 6 1 . hexacerum, Ehr. (S. tricorne, Ralfs). General, but occurs 



sparingly. Zygospores have been observed at Scotston 

 Moor, near Aberdeen. 



(3 Ralfs. General, but scarce, 



y semiluHare, Wittr. Apparently rare. Aberdeen 

 Whitestripes (Mr. A. Murray). 



6 1. S. hirsutum (Ehr.), Breb. General, but scarce. 



62. .S. horametrum, n. sp. Rare. 



Medium-sized, a little longer than broad, "hour-glass" 

 shaped, constriction opening rectangularly, sides about 



