JACKSON: UREDINALES OF OREGON 259 



140. PucciNiA OBTECTA Pk. Bull. Buff. Soc. Nat. Hist, i: 66. 1873. 

 Aecidium compositarum Bidentis Burrill; DeToni in Sacc. Syll. 



Fung. 7: 799. 1888. 

 On Cyperaceae: 



Scirpus americanus Pers. (5. pungens Vahl.) — Westfall, Malheur 

 Co., Aug. 1901, Griffiths & Carter (Griffiths, W. Am. Fungi 353). 



Arthur (Jour. Myc. 14: 20. 1908) has cultured this species on 

 Bidens. Using telia on S. americanus from Indiana successful infec- 

 tion resulting in pycnia and aecia was obtained on B. frondosa and 

 B. connata. Aecia have not been collected west of the Rocky Mt. 

 region. The above collection was issued as P. canaliculata, which is 

 now interpreted as occurring only on Cyperus having aecia on Xan- 

 thium and is unknown in Oregon. 



141. Puccinia Ortonii sp. nov. 



0. Pycnia few, imperfectly known. 



1. Aecia chiefly hypophyllous, gregarious, in roundish or elongated 

 groups 6-8 mm. across, short cupulate, 0.2-0.3 mm. in diameter; 

 peridium yellowish, the margin erose; peridial cells oblong or rhombic, 

 20-26 by 29-35 M, slightly overlapping, the outer wall finely striate, 

 8-10 /x thick, the inner verrucose or slightly tuberculate, 4-6 /x thick; 

 aeciospores globoid or broadly ellipsoid, 18-19 by 19-24 /x, wall color- 

 less, 1-1.5 M thick, very closely and finely verrucose. 



II. Uredinia amphigenous, scattered, round, 0.5-1 mm. across, 

 tardily naked, cinnamon brown, cinereous when covered, ruptured 

 epidermis conspicuous, pulverulent; urediniospores broadly ellipsoid 

 (or when young obovoid), 19-26 by 23-32 /x, wall cinnamon brown, 

 2-3 jx thick, moderately and very minutely and obscurely echinulate; 

 pores 3-5, scattered. 



III. Telia amphigenous, scattered, round, 0.2-1 mm. across, 

 tardily naked, ruptured epidermis conspicuous, chestnut brown, 

 cinereous when covered, pulvinate, somewhat pulverulent; teliospores 

 broadly and somewhat angularly ellipsoid, 18-26 by 30-42 ^c, rounded 

 at both ends, slightly or not constricted at the septum, wall chestnut 

 brown, 1.5-2.5 /x thick, uniform, smooth, with hyaline papilla over 

 pore of apical cell which is usually at the apex but occasionally placed 

 laterally, pore of lower cell varying in position from near the pedicel 

 to the septum; pedicel deciduous, colorless. 



On Primulaceae: 



Dodecatheon Hendersonii leptophylla Suks. — Lake of the Woods, 

 Cascade Range, Aug. 1892, Moses Craig. 



The above collection bears aecia and uredinia only. This species 

 dififers from P. melancoides (cf. 128) in the presence of uredinia in the 

 life cycle. It is to be regarded as a correlated form with that species. 



