ON SCOTTISH DESMIDIE/E 241 



88. S. pachyrynchum, Nordst. — Very rare. Aberdeen — Slewdrum 



in Birse, and Heughhead near Aboyne. 



89. S. papillosum, Kirch. — Very rare. Ross — Loch Kinnelan ; 



Aberdeen — Tonley Pond. 



90. S. paradoxum, Meyen. — General. One crushed zygospore seen 



on Kerloch in Kincardine : it had been globular, not large, 

 with few long spines, 2-3-fid at the apex. 



/3 longipes, Nordst. — Very rare. Caithness — Loch Hem- 

 [ prigs (Mr. James Mitchell) ; Ross — Poolewe (Rev. D. 

 Campbell) ; Moray — Dallas ; Argyle — Glen Coe (Mr. 

 W. Archer). 

 y parva, West. — Common. 



91. S.pileolatuui, Breb. — Not common. Ross, Aberdeen, Kincardine, 



Perth, Argyle. With zygospores, which have been lost, in Kin- 

 cardine, at Den of Garrol. They were pretty large, globular, 

 with not very numerous stout spines, 2-3-fid at the apex. 



92. S. pilosum (Nag.) Archer. — General, but scarce. With zygo- 



spores, in Kincardine at Cammie, and Argyle in Glen Coe. 



93. S. polymorphism, Breb. — General, and variable. 



94. S. polytrichum, Perty. — Not common. Ross, Inverness, Aber- 



deen, Kincardine, Forfar, Perth, Argyle, Wigtown. 



This species I look upon as identical with S. Pringsheimii, 

 Reinsch ; and being the older name, it must take the place of 

 Reinsch's. They agree in size and form ; and in the arrange- 

 ment and size of the spines. — S. saxonicum, Bulnh., appears 

 to be distinct, having its semi-cells oval rather than elliptical, 

 and its spines differently arranged, much more numerous, and 

 smaller. For the sake of comparison, figures of both species 

 from Deeside specimens are given on our Plate III. : fig. 8 

 is S. polytrichum, Perty, and fig. 1 o is £ saxonicum, Bulnh. 



95. S. proboscidiu?n, Archer (S. asperum, Breb., fiproboscidium, Breb.) 



— Not common. Ross, Inverness, Aberdeen, Kincardine, 

 Forfar, Perth, Fife, Arran. 



96. S. pterosporum, Lundell. — Not uncommon. With zygospores, in 



Aberdeen, at Heughhead, near Aboyne. 



97. S. punctulatum, Breb. — General, but rather scarce. 



98. S. pungens, Breb. — Not common. Aberdeen, Kincardine, For- 



far, Perth. 



99. S. pygmcBum, Breb. — Not common. Ross, Aberdeen, Kincar- 



dine, Forfar, Perth. 



Forms ma/us and minus, Wille. — IV< il >ably rare. Aberdeen 



— lien Muichdhui, above Loch Etchachan. 

 Var. semicirculare, Wittr. — Rare. Kincardine — near 



Clochnaben. 

 Var. obtusion, Wille. — Rare. Forfar — in Canlochan. 



