The Scottish Naturalist. 27 



had been in the habit of considering U. filicum^ but as I had 

 mislaid my specimens of the latter I was not able till lately to 

 compare the spores. Having done so, I find that they are very 

 different, and that two species have been confounded under the 

 name U. filiaim. 



Being under some doubt as to which was the original plant 

 of Desmazieres, I wrote to the Rev. M. J. Berkeley, who with 

 his usual kindness replied, " Desmazieres' plant is on Cystopteris. 

 Your new species must be that on Scolopcndrium. It is pro- 

 bably the uredo spores o^ a Fiiccinia, which has hitherto occurred 

 in such small quantities, that it has not been published." 



The two species may thus be distinguished. 



Uredo filicum Desm. 



Sori hypogenous, subrotund, bullate ; epidermis at length rup- 

 tured ; spores subglobose, yellow j epispore smooth. Length 

 of spores .0075 — .01 inch. 

 On fronds of Cystopteris fj'agilis and C. dentata. Probably 

 common. Ascends to 2,700 feet, on Ben Lawers. 



Uredo? pteridum n.sp. 



Sori hypogenous, subrotund, bullate; epidermis not rup- 

 tured (?) ; spores oblong oval, yellowish \ epispore distinctly 

 papillose. Length of spores .015 — .0175 inch. 

 On fronds of Scolopendriiun vulgare. Forden, N. Wales (Rev. 

 J. E. Vize). 



The shape and structure of the spores, as well as their much 

 larger size, at once separate this from U. filicum, which other- 

 wise it rather resembles. Should it prove to be the Uredo state 

 of a Fuccinia, the name will be Puccinia pferidiun In my 

 copy of Dr. M. C. Cooke's " Fungi Britannici," 2nd edition, 

 the specimen (No. 73) with the name Uredo filicum Desm., is 

 UJ pteridum, but the spores figured are apparently those of 

 U. filicum. 

 Perth, Dec, 1876. 



NEW OE KAKE LICHENS. 

 By J. STIRTON, M.D., F.L.S. 



THE following new and rare lichens were gathered in 

 1874 by Mr. R. H. Paterson of Glasgow on or near 

 Ben Brecht, Argyleshire :— 



