78 



Mycologia 



species and of P. medullapanis resemble each other closely in ex- 

 ternal appearance. The following specimens of P. Alabamae 

 have been examined : 



Rav. Fungi Am. 100; Florida, Calkins 90, 164, 149, 183, 842, 

 843, 921, Lloyd 2130 (in part), Ravenel; Mississippi; Mexico, 

 Murrill (5/p. 



Polyporus roseo-isabellinus and P. isabellinus, described by 

 Patouillard and Gaillard from Venezuela in 1888, should be care- 

 fully compared with P. Alabamae. The spores of the former 

 are said to be ovoid, 6 X 8 /z, while those of the latter are de- 

 scribed as ovoid, 13 X Externally, the types are much alike. 



2. Poria vaporaria (Fries) Cooke, Grevillea 14: 111. 1886 



It is unfortunate that the type of this species does not exist 

 in the herbarium of Persoon, but it is probably identical with 

 Polyporus Vaillantii (DC.) Fries, which Hennings found in 

 pileate form at Berlin and discussed in an illustrated article pub- 

 lished several years before his death. This plant is common in 

 the greenhouses of Europe, often appearing in abnormal forms. 

 I have seen no American material to match it closely. 



The plant generally called by this name, however, both in 

 Europe and America, is Fries' misconception of Persoon's species. 

 This is abundant with us and is quite well recognized except 

 where confused with certain forms of Irpex. Polyporus sin- 

 uosus Fries (not Irpex), Physisporus rixosus P. Karst., Physi- 

 sporus serenus P. Karst., and Physisporus luteoalbus P. Karst. 

 are closely related European species. 



The only synonym available for use appears to be P. incerta, 

 which is much more appropriate than P. vaporaria, since the 

 plant is not common in greenhouses — although any change is 

 unfortunate. 



Poria incerta (Pers.) comb. nov. 



Polyporus {Poria) vapor arius Fries, Obs. Myc. 2 : 260. 181 8. 



Not Poria vaporaria Pers. Tent. Disp. Fung. 1 : 70. 1797. 

 Boletus incertus Pers. Myc. Eur. 2: 106. 1825. 



Described from Europe, on dead wood of pine and other trees. 

 Bresadola characterizes it as follows : 



