Jan. 1907] New Genera of Uredinales 29 



the whole set oi spore-forms in assembling the characters held 

 in comiTion. In addition to these two sources of information re- 

 garding relationship sufficient knowledge of the whole body of 

 Uredinales is now available so that some importance must be at- 

 tached to the pari passu relationship of the host on which the 

 fungus occurs. 



In establishing the following genera these three points of 

 view for determining relationship have been taken into account, 

 zic, morphological characters, life-cycle, and family of the host. 



POLIOMA Arthur gen. nov. 



Cycle of development includes pycnia and telia, both sub- 

 epidermal. 



Pycnia flask-shaped or globoid, central cavity usually large, 

 ostiolar filaments apparently wanting. 



Telia erum.pent, somewhat indefinite, without peridium or 

 paraphyses ; teliospores pedicelled, two-celled, wall very pale or 

 colorless, homogeneous, smooth, one pore in each cell and apical. 

 Spores usually germinate upon maturity. 



Type species : Piiccinia nivea Holw., on Salvia purpurea 

 Cav. Genus related to Eriosporangiiini, but without as many 

 spore-forms. The generic name is taken from the Greek for 

 grayness, in allusion to the usual appearance of the telial sori. 



Polioma nivea (Holw^.) Arthur nom. nov. 



Puccinia nivea Holway, Jour. Mycol. 11:158, 1905. On 

 Salvia purpurea Cav., Oaxaca, Mex., Oct. 21, 1899, 5(5p(5, and 

 Nov. II, 1893, 5378, E. W. D. Hohvay 



Polioma griseola (Lagerh.) Arthur nom. nov. 



Puccinia griseola Lagerh., in Sydow, Monog. Ured. 1 1296, 

 1902. On Salvia sp., Ecuador. 



Polioma delicatula Arthur sp. nov. 



O. Pycnia unknown. 



III. Telia hypophyllous, scattered or somewhat confluent 

 in compact groups, round, 0.3-0.4 mm. across, soon naked, pul- 

 vinate, dirty white, becoming cinereous by germination, ruptured 

 epidermis not noticeable ; teliospores oblong or lanceolate-oblong, 

 rounded or obtuse at apex, 12-15 x 40-48/^, slightly or not con- 

 stricted at septum, wall colorless, medium thin, 1-2/1,, not thick- 

 ened above, smooth ; pedicel hyaline, short. 



On Salvia elegans Vahl., Sacred Mt., Amecameca, Mex., 

 Oct. 20, 1903, E. W. D. Holway, 5200. Differs from P. griseola 

 in the smaller spores without apical thickening. 



