368 THE FUNGI WHICH CAUSE PLANT DISEASE 



and below, slightly or not constricted at the septum, wall cinnamon 

 brown, 1-1.5 n, thick; pores usually 3 in upper cell, 1 apical, 2 

 near the septum, in the lower cell 2 pores near the septum. 



O and I on apple and moimtain ash. 



III. Telia on Juniperus communis and J. sibirica. In Europe. 



The teliospores occur on both twigs and leaves. Marked def- 

 ormation is caused by this stage on leaves and petioles. 



G. clavipes C. & P. ^ ( =G. gerininale [Schw.] Kern). 



I. ^cia (=Roestelia aurantiaca) on stems and fruits, crowded 

 on hypertrophied areas of various size on the twigs and peduncles, 

 occupjring part or nearly all of the surface of the fruits, cylindric, 

 1.5-3 mm. high by 0.3-0.5 mm. in diameter; peridium whitish, 

 becoming coarsely lacerate, sometimes to base, erect or spreading; 

 peridial cells seen in both face and side views, polygonal-ovate or 

 polygonal-oblong in face view, 19-39 x 45-95 ii, rhomboid in side 

 view, 25-40 n, thick, outer wall moderately thick, 3-5 /i, inner wall 

 very thick, 13-23 ii, coarsely verrucose with loosely set, large, 

 irregularly branched papillae, side walls verrucose on inner half 

 similar to inner wall; aeciospores globoid, large, 31-32 x 24-39 n, 

 wall pale yellow, thick, 3-4.5 /x, rather coarsely verrucose with 

 crowded slightly irregular papillae. 



III. Telia cauUcolous, appearing on slight fusiform swellings, 

 usually aggregated, roundish, 1^ mm. across, often confluent, 

 hemispheric, 1-3 mm. high, orange-brown; teliospores 2-celled, 

 ellipsoid, 18-26 x 35-51 n, roundish or somewhat acutish above, 

 obtuse below, slightly or not constricted at the septum, wall 

 yellowish, 1-2 /i thick, sUghtly thicker at the apex; pedicles caroti- 

 form, 9-19 /t in diameter near the spore; pores one in each cell, 

 apical in the upper, near the pedicel in the lower. 



I. .^cia on Amelanchier, Aronia, Crataegus, Cydonia, and 

 apple. 



III. Telia on Juniperus commimis and J. sibirica. 



G. comutum (Pers.) Arth. 



A rather uncommon species with I ( =Roestelia comuta [Pers.] 

 Fries) on Sorbus spp. and III on Juniperus communis and 

 J. sibirica. Ranging from New York to Wisconsin and northward ; 

 also in the mountains of Wyoming and Colorado: Europe. Of no 

 considerable economic importance in America. 



