(378) 
As no species are figured either by Dillenius or by Haller 
the first rule applicable in selecting the type species is section 
@ of canon15. As the genus as here published includes 
Agaricus canpestris, and as this is the only economic species, 
it must be selected as the type, hence the Amanzta of Haller 
becomes a typonym of Agaricus of Linnaeus, and must be 
rejected. This is historically correct usage if we are to ac- 
cept the Agaricus of Linnaeus, since the two names were used 
for the same group of species by so many of the older authors. 
They are the only two names that have ever been used to in- 
clude the entire family of the gill fungi. 
The next important author to publish on the genera of the 
gill fungi was Paulet. Thetext of his 7razté des Champignons 
was published in 1793. In the first volume he gives a review 
of the early literature of the fungi with a complete table of syn- 
onyms. In the second he describes many species and a number 
of genera, but unfortunately he only uses vernacular names in 
the text, the formal latin ones appearing with the plates, which 
were issued later and at long intervals, in forty-two fascicles, 
the last not appearing until 1835, long after Paulet’s death. 
His genera, therefore, can only date from the publication of 
the plates. As the original edition of the plates has not 
been accessible it has been difficult to determine accurately the 
date of issue of the different parts. Apparently fascicles 1-8 
were issued prior to 1812 and no more until 1818 or later. 
Fascicles 31-42, containing 56 plates only, appeared in 1835, 
after a long interruption. With this understanding of the 
facts we are able to place three of his genera in the available 
list. These are Hyponevris, Hypophyllum, and Hypoden- 
drum, and all of them are recognized in the following pages 
of the present memoir. 
Schaeffer, Scopoli, Bolton, and Bulliard, who described 
so many new species, seem to have followed Linnaeus closely 
in the matter of genera. 
Persoon was the first to classify the gill fungi on anything 
approaching modern lines. In Observationes Mycologicae 
(1796) he established Aussu/a, and in Tentamen Disposs- 
