Part 3, 1912] AECIDXACEAE 191 



less, margin nearly erect, erose; peridial cells rhomboidal , 30-45 m long, slightly over- 

 lapping, the lumen small, the outer wall much thickened, 10-13/^, transversely striate, 

 smooth, the mner and side walls thinner, 3-5//, somewhat striate, moderately verrucose ; 

 aeciospores broadly ellipsoid, usually somewhat angular, 23-27 by 27-39// ; wall pale-yellow, 

 thick, 3-4//, minutely verrucose. 

 On Malaceae : 



Malus rivularis (Doug.) Roem., British Columbia. 



Sorbus occtdentahsJS. Wats.) Greene, Washington ; British Columbia. 



Sorbus scopuhna Greene, Alaska. 



III. Telia unknown. 



Syj^™^^^^*^^ \?^^^f ^^^^' Vancouver Island, British Columbia, on Sorbus occidentalis. 

 tt T rr^ • ■JP'JF ^^^ Pacific coast from Washington northward to southeastern Alaska. 



Illustrations : Bull. N. Y. Bot Gard. 7 : 438,/. 3; pi. 152,/. 38. 



3. Gymnosporangium frateruum Kern, Bull. N. Y. Bot. 



Gard. 7 : 439. 1911. 



O and I. Pycnia and aecia unknown. 



III. Telia foliicolous, from an annual mycelium, solitary, scattered, oval, 0.8-2 mm. 

 across, pulvinate, chestnut-brown, ruptured epidermis usually noticeable; teliospores 

 2-celled, ellipsoid, 16-19 by 39-48//, rounded above, narrowed below, slightly constricted 

 at the septum; wall cinnamon -brown, moderately thin, 1.5-2.5/f, thicker above, 3-5 /i, 

 the pores 2 in each cell, near the septum ; pedicels cylindrical, uniform, 5-6// in diameter. 



On Juniperaceae : 



Chamaecyparis ihyoides (I^.) B.S.P. (C sphaeroidea Spach, Cupressus thyoides ly.), Massa- 

 chusetts, New Jersey. 



Type locality : Newfield, New Jersey, on Chamaecyparis thyoides. 



Distribution : Small area along the Atlantic coast from Massachusetts to New Jersey. 



Illustration : Bull. N. Y. Bot. Gard. 7 : 439, /. 4. 



EJxsicCATi: Seym. & ^arle, Kcon. Fungi 244; BlHs, N. Am. Fungi 1479; Roum. Fungi Sel. 



4886. 



4. Gymnosporangium inconspicuum Kern, Bull. Torrey 



Club 34: 461. 1907. 



Roestelia Harknessianoides Kern, Bull. Torrey Club 34 : 463. 1907. 



0. Pycnia chiefly fructicolous, numerous, scattered or often more or less crowded over 

 considerable areas, punctiform, honey-yellow becoming blackish, globoid, large, 160-220/^ 

 in diameter by 150-210^ high ; ostiolar filaments 65-80^ long. 



1. Aecia chiefly fructicolous, scattered irregularly or crowded over the entire surface, 

 cylindrical, 0.5-0.8 mm. in diameter, 2-4 mm. high ; peridium yellowish-white, rather tough, 

 rupturing at apex, not becoming lacerate along the sides, remaining tubular; peridial cells 

 seen in both face and side views, not hygroscopic, remaining straight when wet, polygonal- 

 oblong in face view, 25-35 by 65-100 ^, rhomboidal in side view, thick, 45-55 ^, the outer wall 

 moderately thick, 5-8 ^t, smooth, the inner wall very thick, 27-35 /i, moderately and closely 

 verrucose with slightly irregular papillae, the side walls verrucose on the inner surface, 

 similar to the inner wall, about two thirds of the surface smooth ; aeciospores globoid, 23-27 

 by 25-31 //; wall pale-yellow, 2-2.5// thick, finely verrucose, the pores obscure, scattered. 



On Malaceae : 



Amelanchier alnifolia Nutt., Colorado, Utah. 



Amelanchier oreophila A. Nels., Colorado. 



Amelanchier utahensis Koehne, New Mexico. 



III. Telia caulicolous, from an annual or perennial mycelium, usually arising from 

 between the scale-like leaves on the green twigs, often causing a yellowing of the leaves, 

 more rarely on the woody branches, scattered or aggregated and often confluent about 

 the entire margins of several adjacent scale-like leaves, pulvinate, oblong, about 0.4-1 

 mm. wide by 0.5-1.5 mm. long by 0.5-1 mm. high, reddish-brown; teliospores 2-celled, 

 oblong-ellipsoid, 25-29 by 55-80 /i, roundish or often acutish at the apex, obtuse below, not 

 or only slightly constricted at the septum ; wall thin, about 1//, golden -yellow, the pores one 

 in each cell, apical in the upper, near the pedicel in the lower cell ; pedicel hyaline, caroti- 

 form, swelling greatly next to the spore, 25-65 /i, very long. 



