﻿590 Arthur: New species of Uredineae 



and P. nodosa. The teliospores are somewhat broader than in 

 those species, and the general appearance is that of a more luxuri- 

 ant growth. There is considerable resemblance to the short- 

 cycle species P. Lojkojana Thiim., occurring in southeastern 

 Europe on Ornithogalum and Muscari, The name has been chosen 

 to indicate the only locality where the species has yet been found, 

 and in compliment to the management of the Desert Botanical 

 Laboratory, who so enthusiastically assisted Dr. Fromme and 

 myself in our studies of the rust parasites of the vicinity. Tuma- 

 moc Hill is a rocky eminence having the sparse desert vegetation 

 characteristic of the arid region about. In the early spring Diptero- 

 stemon, more usually called Brodiaea, is abundant over the whole 

 area, up to the very doors of the Laboratory, its attractive flowers 

 lending a special charm to the place. This species of rust and 

 P. Carnegiana occur here and there in fair abundance, but are not 

 general. The isolated manner of occurrence gave some counte- 

 nance to the suggestion that mycelium hibernated in the bulbs. 

 The problem of continuity through the long arid season is, how- 

 ever, one that will require considerable investigation. The interest 

 in its solution is not confined to this species, or even to similar 

 desert species, important as such knowledge would prove, but 

 extends to species in other regions, including some of highly 



Puccinia agnita sp. nov. 



O. Pycnia chiefly epiphyllous, loosely grouped on discolored 

 spots, punctiform, moderately conspicuous, subepidermal, angu- 

 larly globoid in section, 65-115/1 in diameter; ostiolar filaments 

 about 35 n long. 



in. Telia chiefly hypophyllous, irregularly grouped on pale 

 spots 4-6 mm. across, round or oblong, 2-8 mm. across, at first 

 covered by the membranous epidermis, soon naked, very pulveru- 

 lent, Hght chestnut-brown; teliospores ellipsoid, 21-27 by 29- 

 42 ju, rounded or obtuse at both ends, slightly or not constricted 

 at septum; wall golden-brown, uniformly thin, 1.5-2 /z, incon- 

 spicuously verrucose, the pore in upper cell apical, in lower cell 

 depressed two- thirds below septum, both pores with hyaline 

 papilla; pedicel colorless, fragile, appearing short. 



On Claytonia megarrUza (A. Gray) Parry, Cumberland Mine, 

 La Plata Mountains, Colorado, altitude 12,000 feet, July 15, 1898, 



