VI PHEFACE. 



vspecies by Fries, and their transference sometimes to other 

 sub-genera or even genera. As the number of new 

 British species was found to exceed the number of the 

 old, it was decided to make the supplementary part of the 

 new edition include the names of the whole of the British 

 species of Hymenomycetes. The species as given in the first 

 edition of the Outlines are not re-described in this volume, 

 but the page at which the description may be found in the 

 first volume is given after the name. This plan has fur- 

 nished the opportunity of adding the diameter of the pileus 

 to the descriptions of nearly all the Hymenomycetes. 

 This addition is most necessary, as one of the first facts a 

 beginner wishes to acquaint himself with is the size of the 

 fungus described. A few species of fungi vary greatly 

 in superficies, but the majority have an average size. 



Another addition, which it is hoped will be found of 

 value, especially to London students, is the marking of all 

 the species hitherto found in Epping Forest. 



The new descriptions have been made as short as 

 possible, according to Mr. Berkeley's original plan. Fries 

 has described nearly all his species three, four, or more 

 times, and the longest descriptions are in his Motiographia 

 Hijminomycetvm Sttecue and Hi/incnomi/cetes Et/rojuei. The 

 descriptions of Fries' species in the present volume have 

 been condensed from the two works just quoted. It has 

 not been thought necessary to repeat generic, sub-generic, 

 and sectional characters in the specific descriptions. For 

 instance, if " gills decurrent " is found as a sub-generic 

 or sectional character, it must be understood that this 

 character applies to every species in the sub-genus or 

 section which follows, unless otherwise pointed out in the 

 specific description. The generic and sub-generic charac- 



