GEOGRAPHICAL DISTRIBUTION. 273 
laria and Tricholoma, which have becn found in Russia, have 
been met with in Sweden only in Upland, that is, in the most 
castern province; all the species which belong to the so-called 
abiegno-rupestris and pineto-montane regions of Sweden are 
wanting in England; and it is only in Scotland that the species 
of northern mountainous and pine-bearing regions are met with— 
a circumstance explicable from the similarity in physical features 
between Sweden and the northern portions of Great Britain. 
The species of Coprinus appear to find suitable habitats in 
every quarter of the globe. 
The Cortinarie predominate in the north; they abound in 
Northern latitudes, especially on wooded hills ; but the plains offer 
also some peculiar species which flourish during the rainy days 
of August and September. In less cold countries they are more 
scarce or entirely absent. The species of the genus Hygropharus 
would at first seem to have a similar geographical distribution 
to those of the last group; but this is really not the case, for 
the same Hygrophort are to be found in nearly every country of 
Europe, and even the hottest countries (and those under the 
equator) are not destitute of representatives of this wide-spread 
genus. 
The Lactarii, which are so abundant in the forests of Europe 
and North America, appear to grow more and more scarce 
towards both the south and north. The same may be stated 
in regard to Russula. 
The genus Marasmius is dispersed throughout the globe, and 
everywhere presents numerous species. In inter-tropical coun- 
tries they are still more abundant, and exhibit peculiarities in 
growth which probably might justify their collection into a 
distinct group. 
The genera Lentinus and Lenzites are found in evcry region 
of the world; their principal centre, however, is in hot countries, 
where they attain a splendid development. On the contrary, 
towards the north they rapidly decrease in number. 
The Polypori constitute a group which, unlike that of the 
Agarics, especially belongs to hot countries. The Bole/i con- 
stitute the only exception to this rule, since they select the 
13 : re 
