88 2 Uretliuales, Uredinaceie infer., Aecidium. 



Hab. in foliis Hieracii albiflori, canadensis, gra- 

 c i 1 i s , ni a c u 1 a t i , p a n i c u 1 a t i , s c a b r i , in America bor. 



54. Aecidium Ivae Jacks., Proceed. Indiana Ac. of Sc, 1917, p. 373 304i 

 (1918). — Sydow, Mon. Ured. IV, p. 44 (1923). — Pycnidiis aniplii- 

 genis, gregariis, subepiderniiois, nielleis, dein brunneis, 80-140 |i, 

 diaiu. ; aecidiis pleruuique bypopliyllis, subinde etiaiu epiphyllis, 

 maculis 0,5-2 cm. diam. flavidis insidentibus, gregariis, cupulatis, 

 0,2-0,35 mm. diam., raargine lacerato recurvato ; cellulis peridii 

 rliomboideis, imbricatim positis, 30-50 «lG-22, pariete exteriore 

 striato 5-7 (x crasso, interiore verrucoso 3-5 [jl crasso; sporis angu- 

 lato-globosis usque elHj^soideis, dense verruculosis, subbyalinis, 

 26-34 * 21-28, episporio 2-3 fx crasso. 



Hab. in foliis I v a e f r u t e s c e n t i s (= I. ovariae), Ame- 

 rica bor. 



55. Aecjdium Keerliae Artli., Bull. Torr. Bot. CI. XLV, 1918, p. 154.— 304( 

 Sydow, Mou. Ured. IV", 1918, p. 45. — Pycnidiis amphigenis, gre- 

 gariis, modice copiosis, melleis, dein brunneis, 90-125 [i diam.; ae- 

 cidiis bypopbyllis, macubs flavidis usque 1 cm. diam. insidentibus, 

 dense gregariis, cu])ulatis, 200-250 \i. diam., margine recurvato la- 

 cerato ; cellulis peridii firme conjunctis, subquadratis usque rbom- 

 boideis, 25-32 [i longis, 20-25 ij. latis, pariete exteriore striato 4-5 |ji 

 crasso, interiore verrucoso 3-4. p. crasso; sporis valde variabilibus? 

 globosis, ovatis, ellipsoideis vel oblongis, varie angulatis, den.se 

 minuteque verruculosis, subbyalinis, 15-21^12-18, episporio 1 [x, 

 ad aj>icem 3-6 ii crasso. 



Hab. in foliis K e e r 1 i a e m e x i c a n a e, Guadalajara, Mexico 

 (0. G. Pringle). 



56. Aecidium Lactucae-debiiis Sydow, Mon. Ured. IV, 1918, p. 45. — 3i 

 Pycnidiis ampbigenis, in centro macularum gregariis, sat copiosis, 

 primo melleis, dein rufo-bruuueis, 100-130 p. diam, ; aecidiis by- 

 popbyllis, maculis orbicularibus flavidis vel flavo-brunueis 4-8 mm. 

 diam. insidentibus, plerumque laxe circulariterque dispositis, cu- 

 pulatis, ca. 250 [i diam., margiue albo laciniato recurvato; celhilis 

 peridii irregulariter rbomboideis, 24-30 * 16-20, pariete exteriore 

 tenuiter striato 4-8 \i crasso, interiore verrucoso ca. 3 \i. crasso ; 

 sporis angulato-globosis vel ellipsoideis, dense subtiliterque verru- 

 culosis, subbyalinis, 16-20 ^ 15-17, episporio 1 p. crasso, 



Hab. iu foliis Lactucae debilis in Japouia, ubi e multis 

 locis cognitum. 



57. Aecidium Lactucae-sativae Sydow, Urediueen n. 699 (1892); Mon. 304 



