TRANSACTIONS 



NATURAL HISTOM SOCIETY OF GLASGOW, 



I. 



REVISION of the SCOTCH PERISPORIACEAE.. 



BY PROFESSOR JAMES W. H. TRAIL, A.M., M.D., F.L.S. 



[Uead 27tli December, 1888.] 



In Dr. Stevenson's very useful work, the Mycologia 

 Scotica, the species of Perisporiaceae then known 

 to occur in Scotland were enumerated, and their 

 provincial distribution -was detailed, as fully as was 

 then possible. But during the nine years that have 

 elapsed since the appearance of Dr. Stevenson's book 

 our information with regard to this, as well as to- 

 other families of fungi, has been largely extended 

 both within Scotland and by the publication of 

 numerous important works relating to the fungi of 

 Europe and of the United States of America. Fuller 

 knowledge has rendered changes in the nomen- 

 clature of some species imperative in obedience to 

 the law of priority ; while certain forms that were 

 enumerated in the Mycologia as good species are not 

 founded on characters such as to justify their reten- 

 tion in this rank. Induced by these considerations, 

 I have attempted a revision of the grou]3, so as to- 

 indicate the actual state of our knowledge of the 

 Scotch species at this date. The number of species 

 here recorded from Scotland is not so much greater 

 than the number mentioned in the Mycologia as 

 might have been anticij^ated, but the differences in 

 nomenclature are considerable, and the real increase 

 is larger than at a first glance it appears to be. 



