639 



rioldceiis). Pol. purpureuH Roslk. 27, t. 3, cited under Pol. vioUiceus, 

 is, however, no douht anolher |)lant growing on Fdijus. Pol. hae- 

 umlodns grows only on pine as far as I know. 



Polyporus medulla panis. 



Whal plant was respected by Ihe original founder of the name 

 y>me(liilla /ja/j/.s > will probably remain unknown. I doubt, however^ 

 Ihat is was the species so named be Persoon, as the name is not 

 appropriate as understood by him. It is also an open (juestion 

 what Fries ment with that name, though be refers to specimens 

 determined by Persoon, as the only specimen signed by Fries 

 in his herbarium (from which the figure in Icon. sel. t. 190 f. 2 is 

 made) belongs to another species and most probably to another 

 section. There is no doubt, however, that Persoons plant occurs 

 in Sweden. I have collected it at least four times, viz. at Femsjö 

 (Hägnen), at Tyresö in Södermanland, at x4dö in Mälaren, and at 

 Flottsund near Uppsala. In all these places it grew on old stubs 

 of oak. A specimen in Karsten^s herbarium referred by Fries to 

 Pol. medulla panis belongs to Trametes radiciperda grown on pine 

 as usuall3^ And in fact Persooxs Pol. medulla panis is sometimes 

 so like the resupinate state of that species that I at lirst referred 

 thither the collection from Femsjö and only wondered that it grew 

 on oak and that it was more purely white than usually. The two 

 species are decidedly distinct, however, and even not closely allied 

 to each other as will be seen when comparing their spores. — By 

 this opportunity I may say that we are not entitled to boast if we, 

 when using a modern microscope, are able to see that the old 

 authors often made mistakes. Without this divining-rod it is ex- 

 ceedingly difficult in many instances to avoid confusion and even 

 with the use of it we are not seldom liable to be the victims of 

 wrong opinions. 



Polyporus mollis. 



Persoox's expression »poris subflexuosis» in the description of 

 Boletus mollis and the fact that Fries at first referred this species 

 to the genus Daedcdca and also in his last work keeps the charac- 

 ter »poris flexuosis» might possibly raise doubt as to whether the 

 plant I refer to Pol. mollis be the true one, as I have found the 



