GEOGRAPHICAL DISTRIBUTION. 273 



laria and TricJioloma, which have been found in Russia, have 

 been met with in Sweden only in Upland, that is, in the most 

 eastern province ; all the species which belong to the so-called 

 abiegno-rupestrcs and pineto-montancB 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 Cortinarice predominate in the north; they abound in 

 Northern latitudes, especially on wooded hills ; but the plains offer 

 also some peculiar species whicli 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 Hygropliorus 

 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 Hygroplwri 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 Lactariij 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 Hussula. 



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 miglfb justify . their collection into a 

 distinct group. 



The genera Lentinus and Lenzites are found in every 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 Boleti con- 

 stitute the only exception to this rule, since they select tho 



