ON SCOTTISH DESMIDIE/E 251 



8. 6". truncate, Archer. Not common. Inverness head of Glen 

 Sligachan in Skye ; Aberdeen and Kincardine many 

 localities ; Forfar - - Clova Tableland ; Perth - - Birnam ; 

 Argyle head of Glen Coe. 



PENIUM, Brcb. 



1. P. adelochondrum, Elfv. Very rare. Ross Poolewe ; Inver- 



ness head of Glen Sligachan in Skye ; Aberdeen head of 

 Glen Cattie. 



2. P. Clevei, Lund. Kirkcudbright New Galloway. 



3. P. crassiusculum, De Bary. Not uncommon on wet rocks. 



Conjugated near Kyles of Bute in Argyle. Zygospore 

 similar to that of P. phymatosporum, but the angles less 

 prominent and more rounded. 



4. P. cncitrbitinuin, Bisset. Not common. Sutherland -- Loch 



Inver ; Ross near Strathpeffer ; Aberdeen and Kincardine 

 many localities; Forfar Canlochan, and Reeky Linn; 

 Perth Bracklin near Callander ; Argyle near Kyles of 

 Bute; Renfrew --near Greenock ; Kirkcudbright -- New 

 Galloway. 



Var. minor, West. Very rare. Perth Craig-an-Lochan 

 (Mr. W. West). 



5. P. curtum, Breb. Rare. Aberdeen -- Brimmond, and near 



Old Mill Reformatory ; Kincardine Cammie, Glen Dye, 

 and near Cowie ; Perth Rannoch, and near Tyndrum. 

 ft minor, Wille. Aberdeen Ben Muichdhui, above 

 Loch Etchachan. 



6 P. Cylindnts, Ehr. General. With zygospores in a pool a 

 little north of Loch Dawan in Aberdeen. 



7. P. didyiiwcarpiuii, Lundell. General. Conjugation not un- 



common. 



8. P. Digitus (Ehr.), Breb. General and abundant. Zygospore 



globular, smooth, thick walled ; contents dense, faintly 

 yellowish green. Diameter, 73.6 /x; thickness of cell 

 membrane, 3.2 /x. Seen once only, in a wet hollow near 

 Cambus-o'-May, on Deeside, Aberdeen. 



9. P. interruption, Breb. Not common. Ross, Inverness, Aber- 



deen, Kincardine, Forfar, Perth. 



10. P.Jenneri, Ralfs. Rare. Inverness Ben Nevis; Aberdeen 

 Hazelhead, Craigendinnie, Dinnet with zygospores, Home- 

 head in Cromar, Dalbagie, " Break Neck Fall " in Glen 

 Callater ; Kirkcudbright New Galloway. 



