168 NORTH AMERICAN FLORA [Voi^tTMB 7 



I. Aecia hypophyllous and petiolicolous, often compound and confluent, 0,5-1 mm. 

 across, applanate, bright orange-yellow fading to pale-yellow, ruptured epidermis usually 

 conspicuous ; paraphyses not numerous nor conspicuous, surrounding each individual sorus, 

 erect, not equaling the height of the spore-mass, clavate, 10-16 by 40-48 /", the wall evenly 

 thin, 1/i, nearly or quite colorless, smooth ; aeciospores broadly ellipsoid or globoid, 19- 

 26 by 21-27// ; wall pale-yellow, rather thin, 1-1.5 M, finely and indistinctly verrucose, the 

 pores large, obscure. 



II. Uredinia hypophyllous, numerous, thickly scattered, round, very small, 0.05-0.1 



i 



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

 abundant and conspicuous, strongly incurved, cylindrical or somewhat clavate, 7-13 by 42- 

 70 /i, the wall thin, 1 //, often thickened at or near the end up to 3 /i, nearly or quite color- 

 less, smooth; urediniospores obovate-globoid, large, 16-23 by 20-26 // ; wall yellowish, thin, 

 1-1.5 jU, rather closely verrucose-echinulate, with papillae less than 1 /i apart, the pores 

 indistinct, small, scattered, about 8. 



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

 0.1 mm. across, usually many spores in each sorus, ruptured epidermis inconspicuous ; 

 paraphyses none; teliospores cylindrical, not generally narrowed above or below, 24-30 by 

 85-125,", 8-11- (usually9-or 10-) celled; wall blackish-brown, 5-7/^ thick, closely and rather 

 coarsely verrucose, the apex with a prominent, brownish, subhyaline apiculus, usually 

 slightly roughened, 10-13 ^ long ; pedicel once to once and a half length of spore, the upper 

 part brownish, 9-10 /^ in diameter, the lower part hygroscopic, colorless, much longer than 

 the upper part, in water becoming oblanceolate, 18-23 j" in broadest diameter. 



On Rosaceae : 



Rosa Carolina L., District of Columbia, Illinois, Maryland, Mississippi, New Hampshire, 



New York, Wisconsin ; Ontario. 

 Rosa setigera Michx,, Illinois, Indiana, Kansas, Nebraska. 

 Type locality: North America, on Rosa setigera. 



Distribution : Northward from Maryland, northern Mississippi and Kansas to southern 

 Ontario, nearly throughout the region of the hosts. 



Illustrations : Torreya 9 : 22,/. 2 ; Hedwigia 44 : pi. 4, f. 6. 



Phragmidium 



1908. 



0. Pycnia amphigenous, gregarious and usually confluent, numerous in small groups 

 surrounded by aecia or on spots opposite the aecia, inconspicuous, subcuticular, extending 

 into the lateral walls of the epidermal cells, discoidal, low, 48-77 /^ in diameter by 26-35 ^ 



high. 



1. Aecia hypophyllous and caulicolous, on leaves in annular groups about 1-1,5 mm. 

 across, surrounding the pycnia, on veins and stems swelling into elongate masses 2-15 

 mm. long, orange-colored fading to light-yellow, ruptured epidermis usually conspicuous ; 

 paraphyses abundant, conspicuous, surrounding each individual sorus, erect or slightly in- 

 curved, noticeably taller than the spore-mass, terete-clavate, or capitate-clavate, 13-16 by 

 47-55 /", the wall evenly thin, about 1 {i, colorless, smooth ; aeciospores broadly ellipsoid or 

 obovate-ellipsoid, 18-21 X 24-30 {J- ; wall nearly or quite colorless, moderately thick, 2-3 ^, 

 rather closely echinulate-verrucose, the pores very indistinct. 



II. Uredinia hypophyllous, numerous, scattered, round, small, about 0.1 mm. across, 

 soon naked, ruptured epidermis inconspicuous ; paraphyses numerous and conspicuous, 

 encircling the sorus, strongly incurved, cylindrical or slightly clavate, 12-16 by 48-58 /i, the 

 wall thin, about 1 ^, considerably thicker above and on outer side of curve, nearly or quite 

 colorless, smooth ; urediniospores obovate-globoid or broadly ellipsoid, 15-21 by 18-26 fx ; 

 wall pale-pellow, moderately thin, 1.5-2 /i, somewhat closely verrucose-echinulate, the 

 pores usually indistinct, scattered, 6 or more. 



III. Telia hypophyllous, at first arising from the uredinia, numerous, scattered, 0.2-0.5 mm. 

 across, blackish, ruptured epidermis inconspicuous ; paraphyses none ; teliospores blackish 

 or blackish-brown, cylindrical or fusiform -cylindrical, 19-29 by 48-93 //, rounded below, some- 

 what acute above, not constricted at the septa, 5-11- (usually 9-) celled ; wall not very dense, 

 with conspicuous pores, rather thin, 4-5 /u, closely and moderately verrucose, the apex with 

 a brownish subhyaline apiculus, usually rough, 7-12 /^ long; pedicel rugose when dry, once 



