194 NORTH AMERICAN FLORA [Volume 7 



I. Aecia chiefly hypophyllous, usually rather few, in annular groups 1-2 mm. across, 

 cylindrical, 2-4 mm. high by 0.3-0.4 mm. in diameter ; peridium tardily dehiscent at apex, 

 first rupturing by longitudinal slits along the sides ; peridial cells seen in both face and side 

 views, not hygroscopic, remaining straight when wet, lanceolate-oblong in face view, 16-23 

 by65-110/i, linear-rhomboidal in side view, 17-27 /^ thick, the outer wall rather thin, 1-1. 5/i, 

 smooth, the inner and side walls rather thick, 5-7 a*, finely and closely verrucose-rugose with 

 irregular and oftentimes ridge-like papillae ; aeciospores globoid, 18-26 by 21-30 {j- ; wall 

 chestnut-brown, 2-3 /i thick, finely verrucose, the pores 8-10, scattered. 



On Malaceae : 



Amelanchier alnifolia Nutt., Colorado, Montana, Nebraska, South Dakota, Wyoming. 

 Amelanchier florida Ivindl., Wyoming; British Columbia. 

 Amelanchier oreophila A. Nels., Colorado. 

 Amelanchier poly car pa Greene, Colorado, Wyoming. 

 Amelanchier pum.ila Nutt., Alberta. 



III. Telia caulicolous, from a perennial mycelium often causing a fasciation of the young 

 shoots and forming witches' brooms, usually the leaves of affected branches taking on the 

 subulate juvenile form, sori usually scattered, apparently arising from the axils of the leaves, 

 hemispherical, 1-2 mm. across by 1-1.5 mm. high, cinnamon-brown becoming yellowish and 

 pulverulent by germination, ruptured epidermal tissues conspicuous ; teliospores 2-celled, 

 ellipsoid, 18-26 by 39-52 ,", slightly or not constricted at the septum, usually rounded both 

 above and below; wall pale cinnamon-brown, rather thin, 1-2 m, occasionally slightly thick- 

 ened over the germ-pores, the pores 2 in each cell, near the septum, or often only one in 

 the upper cell and apical ; pedicel cylindrical, uniform, 5-8 (U in diameter, very long. 



On Juniperaceae : 



Juniperus scopulorum Sarg. {Sabina scopulorum Rydb.), Colorado. 

 Jtmiperus virginiana I^. {Sabina virginiana Ant.), Nebraska, Wisconsin. 



Type locality: Boulder, Colorado, onjuniperus scopulorum. 



Distribution : From British Columbia and Alberta southeast to the Black Hills of South 

 Dakota and to Colorado, and locally in Nebraska and Wisconsin. 



Illustrations : Bot. Gaz. 49 : pi. 22, f. 13 ; Bull. N. Y. Bot. Gard. 7 : pi. 156, f. 53 ; Mycologia 

 3: 158,/. Ic; pl.48,f.3. 



ExsiCCATi: Kills &Kv. N. Am. Fungi Ji^<5,- Ellis & Ev. Fungi Columb. 1676; D. Griff. W. 

 Am. Fungi 246, 264; Earth. Fungi Columb. 2527, 2580, 2977 ; Barth. N. Am. Ured. 108; Vesterg. 

 Micr. Rar. Sel. 1189. 



10. Gymnosporangium Kernianum Bethel, Mycologia 3 : 157. 1911. 



O and I. Pycnia and aecia uncertain. 



On Malaceae : 



Afuelanchier sp. Proven by culture as to host, but without maturing aecia. 



III. Telia caulicolous, from a perennial mycelium, arising between the scale-like leaves 

 on the green twigs, causing a fasciation of the young shoots and forming globose witches' 

 brooms 15-45 dm. in diameter, not causing a reversion to the juvenile form, scattered, 

 usually solitary, hemispherical, 0.5-0.8 mm. across, rather compact, dark reddish-brown ; 

 teliospores chiefly 2-celled, narrowly ellipsoid, 21-26 by 55-74 ,«, narrowed or sometimes 

 rounded at both ends, slightly or not constricted at the septum-; wall thin, about IfJ-, yel- 

 lowish, the pores usually 2 in each cell, near the septum ; pedicel cylindrical. 



On Juniperaceae : 



Juniperus utahensis {'Sin^^Xvi.') I^emm., Colorado. 

 Type locality: Paonia, Colorado, onjuniperus uiahensis. 

 Distribution : Western Colorado. 

 Illustrations : Mycologia 3 : 158, /. la ; pL 48, f. la, 2 ; Bull. N. Y. Bot. Gard. 7 : pi. 156, 



f.52. 



11. Gymnosporangium trachysorum Kern ; Arth. 



Mycologia 2 : 237. 1910. 



0. Pycnia epiphyllous, gregarious, in groups 1-2 mm. across, on discolored spots, 

 prominent, conspicuous, punctiform, orange-yellow becoming brownish-black, globoid, 

 144-165 /i in diameter by 112-128/^ high ; ostiolar filaments 75-90 /^ long. 



1. Aecia hypophyllous, gregarious, rather few in irregular groups 2-5 mm. across, on dis- 

 colored slightly thickened spots5-10mm. or more across, cylindrical, 2-4 mm. high, 0.2-0.3 

 mm. in diameter ; peridium remaining horn-like, finally rupturing by longitudinal slits 

 along the sides ; peridial cells seen in both face and side views, not hygroscopic, remaining 



