Oct. 1903] Index to North American Mycology 
191 
Pam mel, L. H. and Weems, J. B. Corn Moulds and Disease. 
[Aspergillus glaucus.] Iowa Geological Survey Bull, i: 
182-4. 1901. 
Pan us. Key to the North American Species [Earle]. Torreya, 
3:86-7. June 1903. 
Peziza pendula Schw., syn. of Porodiscus pendula q. v. 
Peziza singularia Peck, see Pseudo peziza singularia. 
Puragmidium ivesise Syd. n. sp., in foliis vivis Ivesiae ungui- 
culatse. Ann. Mycolog. 1 '.329. July 1903. 
Phragmidium potentillae-canadensis Diet. n. sp., on Potentilla 
canadensis. Beiblatt zur Hedwigia, 421(179). 4 July 1903. 
Phycomyces nitens, formation of spores, see Spores, Forma¬ 
tion. 
Phycomycetes, four, showing various habits. Laboratory 
Outlines for the Elementary Study of Plant Structures and 
Functions from the Standpoint of Evolution. John H. 
Schaffner. Jour. Appl. Micr. & Lab. Meth. 6:2185-6. Feb. 
1903. 
Pilze, Zwei, aus Ohio, see Z wei neue Pilze. 
Piptoporus, see Polyp oraceae of North America. — V. The 
Genera. 
Piptoporus betulinus Karst., syn. of Piptoporus suberosus 
q. v. 
Piptoporus suberosus (L.) Murrill n. n. [Boletus suberosus 
L., B. betulinus Bull., Polyporus betulinus Fr., Piptoporus 
betulinus Karst.] Bull. Torr. Bot. Club, 30:425. Aug. 
1903. 
Pluteolus, A Key to the North American Species. F. S. Earle. 
Torreya, 3:124-5. Aug. 1903. 
Polyporaceze of North America. — III. The Genus Fomes. 
William Alphonso Murrill. Bull. Torr. Bot. Club, 30:225- 
232. April 1903. 
Polyporace^e of North America. — IV. The Genus Elfvingia. 
William Alphonso Murrill. Bull. Torr. Bot. Club, 30:296- 
301. May 1903. 
Polypqraceze of North America. — V. The Genera Crypto- 
porus, Piptoporus, Scutiger and Porodiscus. William Al¬ 
phonso Murrill. Bull. Torr. Bot. Club, 30:423-434. Aug. 
1903. 
Polyporace/E, A historical Review of the genera of the. William 
Alphonso Murrill. Jour. Mycol. 9:87-102. May 1903. 
