Part 3, 1912] ABCIDIACEAB 165 



I. Aecia hypophyllous, usually compound or confluent, forming sori of roundish out- 

 line 0.5-1.5 mm. across, pulvinate, bright orange-yellow fading to pale-yellow, ruptured 

 epidermis not noticeable ; paraphyses not numerous nor conspicuous, surrounding each 

 individual sorus, incurved, not exceeding the height of the spore-mass, clavate, 12-15 by 

 55-80^, the wall evenly thin, about 1^, nearly or quite colorless, smooth; aeciospores 

 broadly ellipsoid, 19-24 by 23-31 fi ; wall pale-yellow, moderately thick, 1.5-2.5//, moder- 

 ately and closely verrucose. 



II. Uredinia hypophyllous, rather numerous, scattered, roundish, small, 0.1-0.3 mm. 

 across, early naked, ruptured epidermis inconspicuous ; paraphyses encircling the sorus, 

 abundant and conspicuous, strongly incurved, cylindrical or somewhat clavate, 7-12 by 42- 

 85 //, the wall thin, about 1 /t, slightly thicker at the apex, nearly or quite colorless, smooth ; 

 urediniospores broadly ellipsoid or obovate, 15-19 by 19-26 // ; wall pale-yellow, thin, 1-1.5 fJ-, 

 moderately verrucose-echinulate, the pores not distinct, scattered, 6 or more. 



III. Telia hypophyllous, rather numerous, at first arising from the uredinia, scattered, 

 small, 0.1-0.3 mm. across; paraphyses none; teliospores cylindrical, 32-35 by 64-90/^, rounded 

 above and below, 4-6- (mostly 5-) celled; wall chocolate-brown, 4-6 /i thick, closely and 

 moderately verrucose, the apex with a conical hyaline papilla 5-12 fJ. long ; pedicel rugose 

 when dry, once and a half length of spore, the upper half colorless except near the spore> 

 7-10 /i in diameter, the lower part colorless, swelling in water to broadly lanceolate, 22-30 fi 

 at broadest diameter. 



On Rosaceae : 



Oreobaius deliciosus (James) Rydb. {Rubus deliciosus James), Colorado, New Mexico. 

 Oreobatus neo-mexicanus (A. Gray) Rydb. {Rubus neo-mexicanus A. Gray), Arizona, New 

 Mexico. 

 Type locality : Colorado, on Rubus deliciosus. 



Distribution : Northern Colorado southward nearly to the Mexican boundary. 

 BxsiccATi : Bllis & Ev. Fungi Columb. 877; Earth. Fungi Columb. 2340, 2442; Ellis & Ev. N. 

 Am. Vxingi 3246 ; Clements, Crypt. Form. Colo. 153 ; Vesterg. Micr. Rar. Sel. 1131. 



2. Phragmidium imitans Arthur. 



Phragmidium, incrassatum gracile Farl.; Ellis, N. Am. Fungi 252, hyponym. 1879. 

 Phragmidium gracile Arth. Bull. Iowa Agr. Coll. Dep. Bot. 1884: 161. 1884. Not P. gracile 



Cooke, 1871. 



0. Pycnia epiphyllous, solitary or few in small crowded groups completely surrounded 

 by the aecia, not noticeable, subcuticular, yellowish, conoidal, small, 50-80 ^ in diameter, 



30-35^ high. 



1. Aecia epiphyllous, confluent in small annular groups 0.4-0.8 mm. across, pulvinate, 

 orange-yellow fading to pale-yellow, ruptured epidermis somewhat noticeable ; paraphyses 

 not very numerous nor conspicuous, surrounding each individual sorus, incurved, somewhat 

 exceeding the height of spore-mass, clavate, 10-15 by 45-96/^, the wall evenly thin, about 

 1^, nearly or quite colorless, smooth ; aeciospores globoid or broadly ellipsoid, 14-20 byl6- 

 24 /i; wall pale-5'ellow, moderately thick, 1.5-2.5/^, sparsely and sharply papillose. 



II. Uredinia hypophyllous, scattered, roundish, small, 0.1-0.2 mm. across, early naked, 

 ruptured epidermis inconspicuous ; paraphyses encircling the sorus, rather numerous, in- 

 curved, somewhat clavate, 11-17 by 67-96 \i, the wall uniform, thin, about 1 ^, nearly or quite 

 colorless, smooth ; urediniospores broadly ellipsoid, 15-18 by 18-23 ^ ; wall pale-yellow, 

 rather thin, about 1.5 /i, sparsely and rather strongly verrucose-echinulate, the pores 



obscure. 



III. Telia hypophyllous, rather numerous, at first arising from the uredinia, scattered, 



0.3-0.7 mm. across, very early naked, blackish, ruptured epidermis inconspicuous; 

 paraphyses none ; teliospores cylindrical, 26-30 by 80-120//, usually rounded below, rounded 

 or sometimes narrowed above, 6-10-celled ; wall very dark chocolate-brown, rather thick, 

 6-7 //, closely and rather coarsely verrucose, the apex with a blunt, conical hyaline apiculus 

 3-13 '\i long ; pedicel rugose when dry, the upper half colorless except near the spore, 9-10 y^ 

 in diameter^ the lower part colorless, swelling in water to claviform, 15-23 // in diameter. 



Rubus leucodermis Dougl., California, Washington ; British Columbia. 

 Rubus occidenialis X,. , Massachusetts; Newfoundland. 



