June 1902 ] Index to North American Mycology 
85 
Populus tremuloides, decorticated wood, host to Platystomum 
alpinum Tracy & Earle n. sp. PI. Bakerianae, 1132. 22 Feb. 
1901. 
Potato, Rhizoctonia and the, F. M. Rolfs. Science, N. S., 14: 
899. 6 Dec. 1901. 
Potato Scab and its prevention. L. R. Jones and A. W. Edson. 
Bull. Vt. Agr. Exp. Sta. 85:111-120. Feb. 1901. 
Potentilla fruticosa, decorticated stems, host to Zignoella 
potentillae Tracy & Earle n. sp. PI. Bakerianae, 1:28. 22 
Feb. 1901. 
Pound, Roscoe, see Bessey, Charles E, Pound, Roscoe, and Clem¬ 
ents, Frederic E. 
Prionosciadum watsoni, host to Puccinia prionosciadii Lindroth 
n. sp. Meddel. fr. Stockholms Hogskolas botaniska Institut, 
Bd. IV. 1901. 
Psathyra conica Peck n. sp., decaying prostrate trunks of 
Spruce. An. Rep. N. Y. State Mus. 54:153. 1901. 
Pseudomonas hyacinthi, P. campestris, P. phaseoli, and P. stew¬ 
ard. Erwin F. Smith. Bull. U. S. Dept. Agr., Div. Veg. 
Phys. and Pathol., 28: 6 Aug. 1901. 
Pseudomonas juglandis n. sp., on Juglans regia and related 
species. Newton B. Pierce. Bot. Gaz. 31 :2^2. April 1901. 
Pseudomonas hyacinthi (Wakker) Erw. Sm. nov. comb. (In¬ 
oculation Experiments, Morphology, diagnosis) Erwin F. 
Smith. Bull. U. S. Dept. Agr., Div. Veg. Phys. and Pathol., 
26:1-45. 1 pi. 21 Feb. 1901. 
Pseudospore (in Sorophoreae). Proc. Amer. Acad. Arts & 
Sci., 37:333. * D ec. 1901. 
Puccinia and Aecidium stages of one and the same species on 
common sun flower, culture experiments by M. A. Carleton. 
Science, N. S., 13:250. 15 Feb. 1901. 
Puccinia anemones virginianae Schw. (Leptopuccinia; descrip¬ 
tion and figs.), see Bubak. Franz., Ueber die Puccinien 
vom Typus Pucc. anem., etc. 
Puccinia aniscanthii Diet. & Holw. n. sp., on Aniscanthii 
(wrightii?) Bot. Gaz., 31:329. May 1901. 
Puccinia baccharis-hirtellae Diet. & Holw. n. sp., on Baccharis 
hirtella. Bot. Gaz., 311331. May 1901. 
Puccinia batesiana Arthur sp. nov., on Heliopsis scabra Dunal. 
Bull. Torr. Bot. Club, 28:661. Dec. 1901. 
