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. sfiinosum, Ralfs.) — 



General. 



54. S. furcigerum, Breb. — General. Conjugated in a marsh south 



of the Ord, near Dinnet, 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. grad/e, Ralfs. — Not common. Sutherland, Ross, Inverness, 



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



P 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 — Gen 

 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 " Sect 

 Nat," April 1877. 



58. S. gramdosufu, 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 //,; length of spine, 10 p. (Our Plate III., 

 fig. 6.) 



59. S. Heimerlianum, Liitkem. 



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

 — Upper Powlair in Birse ; Kincardine — pool by the 

 Spital Burn, Strachan. 



60. S. hexacerum, Ehr. (S. tricome, Ralfs). — General, but occurs 



sparingly. Zygospores have been observed at Scotston 

 Moor, near Aberdeen. 



fi Ralfs. — General, but scarce, 



y semilunare, Wittr. — Apparently rare. Aberdeen — 

 Whitestripes (Mr. A. Murray). 



61. 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 



