(381 ) 
These latter are based entirely on microscopic and structural 
characters such as heretofore had received but scanty atten- 
tion. Our knowledge of the histology and development of most 
of our species is as yet too limited to enable us always to re- 
cognize his generic distinctions. 
Maire in his Recherches Cytologigue et Taxonomique sur 
les Basidiomycétes (1902) has followed similar lines and has even 
added cytological characters. His work, however, furnishes 
us only one new generic name. 
Various other authors have from time to time established 
one or more genera in this group, but the works mentioned 
above include the more important contributions to the generic 
nomenclature of the gill fungi. 
In preparing this paper a card index has been made giving 
each name, so far as ascertained, that has been used for either 
a genus or a subgenus. Each card shows, besides the name 
of the genus, the name of the author, the date and place of 
publication, and the type species as determined by the above 
mentioned code. A parallel series of cards has also been 
prepared in which the name of the type species stands first, 
followed by the name of the genus which it typifies. For 
convenience the names used for the type species are those 
given in Saccardo’s Syl/loge. 
Armed with these series of cards it is easy to learn quickly 
the bibliographic history of any given group. The following 
alphabetic list is copied from these cards. It includes the 
names that have been applied to genera of the gill fungi since 
1753. Subgeneric names are not given except as they have 
been subsequently raised to generic rank; in this case the 
name of the author of the subgenus is given in parentheses. 
Those names that for any reason are not considered available 
are indicated by prefixing numerals as follows: (1) Type 
species does not belong to the family. (2) Typonym, based 
on the same type species as a previous genus. (3) Homonym, 
previously used for another genus or only a variation in 
spelling of the name of another genus. (4) Hyponym, notas- 
sociable with a determinable binomial species. Those not so 
