182 
Journal of Mycology 
[Vol. 10 
erable differentiation; it may be polymorphic — that is, produce 
different kinds of spores in the different stages presented in the 
course of its life-cycle; the vast quantity of any one host-plant 
cultivated, as Wheat, Maize, the Potato, the Apple, the Grape, 
may afford practically unlimited food for the attendent parasite 
and so the destruction wrought would be almost incalculable. 
These facts not only indicate the importance of Vegetable Path¬ 
ology, or Phyto-pathology, but suggest the very intimate rela¬ 
tion of this subject with that of Mycology. The two can in fact 
be advantageously kept in mind in the future paragraphs of this 
elementary treatise. 
INDEX TO NORTH AMERICAN MYCOLOGY. 
Alphabetical List of Articles , Authors, Subjects, New Species and 
Hosts, New Names and Synonyms. 
W. A. KELLERMAN. 
(Continued from page 143.) 
Polyporaceae of North America — VI. The Genus Poly- 
porus. William Alphonso Murrill. Bull. Torr. Bot. Club, 
31129-44. Jan. 1904. 
Polyporellus Karst., syn of Polyporus Mich. q. v. 
Polyporellus polyporus Murill, syn. of Polyporus polyporus 
q. v. 
Polyporus Mich, [established by Micheli 1729; synonyms: 
Polypurellus Karst., Caloporus Quelet, Leucoporus Quelet, 
Cerioporus Quelet. Murrill.]. Bull. Torr. Bot. Club, 31129. 
Jan. 1904. 
Polyporus arculariellus Murrill n. n. [Favolus curtisii Berk.] 
Bull. Torr. Bot. Club, 31136. Jan. 1904. 
Polyporus brumalis Fr., syn. of Polyporus Polyporus q. v. 
Polyporus catalpae von Schrenk n. sp. and P. versicolor [as dis¬ 
eases of Catapa]. U. S. Bureau Forestry Bull. 37:58. 1902. 
Polyporus cowellii Murrill n. sp., growing on decayed wood. 
Bull. Torr. Bot. Club, 31139. Jan. 1904. 
Polyporus, Key to the North American Species. [Murrill.] 
Bull. Torr. Bot. Club, 31:30-2. Jan. 1904. 
Polyporus luridus B. & C.., syn. of Polyporus polyporus q. v. 
Polyporus maculosus Murrill n. sp., on wood. Bull. Torr. Bot. 
Club., 31 141. Jan. 1904. 
Polyporus polyporus (Retz) Murrill n. n. [Boletus polyporus 
Retz, B. brumalis Pers., B. fasciculatus Schrad., Polyporus 
brumalis Fr., P. luridus B. & C., Polyporellus brumalis 
Karst., Polyporellus polyporus Murrill.] Bull. Torr. Bot. 
Club, 31:33. Jan. 1904. 
