250 ANNALS OF SCOTTISH NATURAL HISTORY 



GONATOZYGON, De Bary. 



1. G. Brebissonii, De Bary. General. Very variable in appear- 



ance, from roughly granulated to perfectly smooth, as at 

 Dalbrake, Kincardine. When smooth it is the G. Iceve, 

 Hilse (Rabenh. " Algae Europ," 1962, January 1867). This 

 form, taken by itself, looks distinct, but in this district every 

 intermediate state occurs. 



2. G. Kinahani (Archer), Rab. Not common. Aberdeen at 



Scotston Moor, Whitestripes Moss, Tillyfour, Powlair, Slew- 

 drum ; Kincardine at Crathes. 



This is a much larger and stouter form than G. Ralfsii, 

 and always occurs in long filaments. 



3. G. Ralfsii) De Bary. General. 



A smooth form of this species also occurs. 



SPIROT.ENIA, Brcb. 



1. S. acuta, Hilse. Very rare. Aberdeen at Upper Powlair, 



Slewdrum, Culblean ; Kincardine at Den of Garrol, and 

 Dalbrake ; Stirling Fintray Hills. 



2. S. bryophila (Breb.), Rab. (muscicola, De Bary). Very rare. 



Aberdeen - - Braes of Gight, Scotston Moor, Dalbagie ; 

 Kincardine at Muchalls. 



3. .5'. closteridia, Kiitz. Very rare. Kincardine at Muchalls, 



near the mill. 



4. S. condensata, Breb. General. Occasionally with zygospores. 



5. S. minitta, Thuret. General, never abundant. 



(3 minutissima, Kirch. Rare. Ross near View Rock, 

 Strathpeffer ; Aberdeen head of Glen Cattie, be- 

 tween Loch Kinnord and Cambus-o'-May ; Kin- 

 cardine pool on Scolty ; Perth Fendoch Hill, 

 forming lines of from 20 to 30 individuals, in pairs, 

 with a little distance between each pair, enveloped in 

 mucus. 



6. S. obscura, Ralfs. Not common. Ross near Tain and Coul ; 



Inverness at Brin ; Aberdeen and Kincardine many 

 localities; Perth at Kilgraston,* and Bracklin ; Stirling 

 Fintray Hills. 



Zygospores have been observed at Cammie in Kincardine. 

 They are similar to those of S. condensata. 



7. S. parvula, Archer. Not common. Nairn in a quarry near 



the town ; Aberdeen and Kincardine many localities ; 

 Forfar Balquhadly Hill in Fern, Clova Tableland ; Perth 

 Durdie, Birnam, Folotry in Fowlis Wester. 



