4 BULLETIN 1366, U. S. DEPARTMENT OE AGRICULTURE 



Rhysotheca, for which the common and well-established name 

 Plasmopara is retained. 



Polypores. — Of the wood-inhabiting polypores and other Hymen- 

 omycetes, only those are included which are known to cause definite 

 diseases or rots of living trees or timber and for which the symptoms 

 have been described in pathological literature. Saprophytic species, 

 or those whose economic importance has not been demonstrated, have 

 been omitted. In the choice of names, the more common usage has 

 been followed. 



Bacteria. — The names used for the bacterial pathogens are those 

 in most common use, as the bacteriologists apparently are not yet 

 entirely agreed in regard to some recently proposed changes. 



frS ^N /^^gf /f/SS/SS//^/ /WZZ^fX 



Fig. 1.— Geographic areas used in the list: New England, Great Plains States, upper Mississippi 

 Valley, lower Mississippi Valley, Ohio Valley States, Middle Atlantic States, and South Atlantic 

 States 



Botrytis. — All pathogens of this genus, with a few exceptions, are 

 here listed under the names Botrytis sp. or Botrytis drier ea Auct. 

 It is probable that several distinct species are included under these 

 names, but since there is no satisfactory basis now available for 

 specific distinction, it seems best for present purposes to include all 

 under these names, pending the appearance of a satisfactory revision 

 of the genus. 



Synonyms. — Synonyms are given in parentheses in certain pleo- 

 morphic species in which the perfect stage is known and in some 

 other cases in which it seems desirable. In general, the name which 

 has been applied to the perfect stage has been adopted. 



