Part 3, 1912] . ABCIDIACHAB 175 



I. Aecia amphigenous, solitary or confluent in annular groups, 0.5-2 mm, across, 

 roundish or oval, applanate, orange-yellow fading to pale-yellow, ruptured epidermis con- 

 spicuous ; paraphyses not abundant nor conspicuous, surrounding each individual sorus, 

 erect, not much exceeding the height of the spore-mass, cylindrical or slightly clavate, 6-8 

 by 40-55//, the wall evenly thin, 1/i, nearly or quite colorless, smooth; aeciospores globoid 

 or broadly ellipsoid, 18-23 by 23-26 ^ ; wall nearly colorless, moderately thin, 1.5-2 fi, rather 

 sparsely and finely verrucose, the pores noticeable, scattered. 



II. Uredinia hypophyllous, scattered, roundish, 0.5-1 mm. across, soon naked, becom- 

 ing pulverulent, ruptured epidermis not noticeable ; paraphyses encircling the sorus, 

 rather numerous, broadly clavate, mostly erect, 12-20 by 50-80 ,«, the wall evenly thin, 1 // or 

 less, nearly or quite colorless, smooth; urediniospores obovate or ellipsoid, 15-21 by 19-26/^; 

 wall pale-yellow, moderately thin, 1.5-2^, rather sparsely verrucose-echinulate, the pores 

 not distinct, scattered, about 8, 



III. Telia chiefly hypophyllous, numerous, scattered, roundish, 0.5-1 mm. across, 

 pulvinate, blackish, early naked, ruptured epidermis not noticeable ; paraphyses none ; 

 teliospores cylindrical, 23-30 by 48-89 M, rounded below, rounded or often somewhat acutish 

 above, usually slightly constricted at the septa, 3-5-celled ; wall chocolate-brown, 3-4 fi thick, 

 sometimes thicker at apex, 5-10//, smooth; pedicel colorless, somewhat rugose when dry 

 especially in the lower part, about 7-10 /* in diameter, once or twice length of spore or 



more, the lower part usually swelling slightly in water. 



On Rosaceae : 



Poienhlla arachnoidea Dougl., Colorado. 

 Poientilla bipinnaiifida Dougl., Montana, North Dakota. 

 PotentUla glabrella Rydb., Manitoba. 



Poientilla monspeliensis I^. {P. norvegica A. Gray, not I,.), Maine. 

 PotentUla pectina la Raf. {P, litoralis Rydb.), Maine; Newfoundland. 

 Poientilla pennsylvanica I^., Assiniboia, Manitoba. 



PotentUla strigosa Pall., Colorado, Montana, Nebraska, New Mexico, North Dakota, South 

 Dakota ; Alberta, Manitoba. 

 Type locality: Europe, on PotentUla argentea. 



Distribution : Atlantic coast from Maine northeastward to Newfoundland, and plains along 

 the eastern border of the Rocky mountains from New Mexico northward to Manitoba and Alberta ; 

 also in Europe. 



Illustrations : Beitr. Krypt. Schweiz V- : /. 286 ; Corda, Ic. Fung. 4 : pi. 5, /. 72. 

 KxsiCCATi: Ellis & Ev. N. Am. l?nnei 2256 ; Clements, Crypt. Form. Colo. J^.^; Brenckle, 

 Fungi Dak. 6; Sydow, Ured. 228J ; Earth. N. Am. Ured. 116. 



17. EARLEA Arth. Result. Sci. Congr. Bot. Vienne 341. 1906. 



Cycle of development includes pycnia, aecia, and telia, with distinct alternating phases ; 

 autoecious. Pycnia subcuticular, other sori subepidermal. 



Pycnia conoidal or much flattened and extending downward between the epidermal 

 cells ; hymenium fiat ; ostiolar filaments wanting. 



Aecia erumpent, usually indefinite, encircling paraphyses usually inconspicuous or 

 wanting. Aeciospores catenulate, ellipsoid ; wall colorless, verrucose with fine or coarse 



beads. 



Telia erumpent, more or less indefinite, without paraphyses. Teliospores two- to 

 several-celled by transverse septa, smooth or verrucose ; wall somewhat laminate, colored, 

 hygroscopic layer obscure, pores two or three in each cell, lateral ; pedicels hyaline, firm, 



of nearly uniform diameter. 



Type species, Aregma speciosa Fries (on Rosa Carolina). 



Teliosporic pedicel much longer than spore. 

 TeHospores 4-celled or more. 

 Teliospores smooth. 

 Teliospores verrucose. 

 Teliospores less than 4-celled. 

 Teliosporic pedicel much shorter than spore. 4. E. bilocularis. 



1. Earlea speciosa (Fries) Arth. Result. Sci. Congr. 



Bot. Vienne 341. 1906. 



Aregma speciosa Fries, Syst. Myc. 3 : 496. 1832. 



Seiridium marginatum Schw. Trans. Am. Phil. Soc. II. 4 : 306. 1832. Not5. margtnaium Nees, 



1 Rl f\ 



Seiridium Smilacis Schw. Trans. Am. Phil. Soc. II. 4 : 306. 1832. 

 Phragmidium speciosum Cooke, GrevilleaS: 171. 1875. 



1. E. speciosa. 



2. E. alaskana. 

 S. E. Horkeliae. 



