174 Bulletin 313 



half similar to the inner wall; seciospores globoid, large, 21-32 by 

 24-39 fx; wall pale yellow, thick, 3-4.5 /*, rather coarsely verrucosa 

 with crowded, slightly irregular papillae, sometimes appearing reticu- 

 late, the pores 6-10, scattered, very obscure. On Cydonia vulgaris 

 and CratcBgus sp. 



"III. Telia caulicolous, from a perennial mycelium, appearing on 

 slight fusiform swellings, usually aggregated, roundish, 1-4 mm. 

 across, often confluent, hemispherical, 1-3 mm. high, orange-brown; 

 teliospores 2-celled, ellipsoid, 18-26 by 35-51 /x, roundish or some- 

 what acutish above, obtuse below, slightly or not constricted at the 

 septimi; wall yellowish, thin, 1-2 yu, slightly thicker at apex, 2-3 fi, 

 the pores 1 in each cell, apical in the upper, near the pedicel in the 

 lower cell; pedicel in the lower cell; pedicels carotiform, 9-19 fi in 

 diameter near the spore, very long." North American Flora, v. 7, 

 p. 197 (1912). 



957. Distorted twig of Cratagus sp. showing aecia. 958. Peridial cells, 1/12. 

 959. Aeciospores, 1/12. 960. Teleutospores, 1/12. 



Gymnosporangium globosum Farl.- — On Juniperus virginiana. 



"O. Pycnia epiphyllous, numerous, gregarious, more or less crowd- 

 ed in irregular groups 1-3 mm. across, on discolored spots 3-7 mm. 

 across, prominent, conspicuous, honey-yellow becoming blackish, 

 slightly flattened, globose, 150-190 ft in diameter by 115-175 /x high; 

 ostiolar filaments 65-80 ft long. 



"I. Aecia chiefly hypophyllous, crowded in irregular annular 

 groups, 2-7 mm. across, on thickened, discolored spots 3-12 mm. 

 across, cylindrical, 1.5-3 mm. high by 0.1-0.2 mm. in diameter; peri- 

 dium soon splitting in the upper part, becoming reticulose half way 

 to the base, the margin finely lacerate or fimbriate, erect; peridial 

 cells seen in both face and side views, not hygroscopic, remaining 

 straight when wet broadly lanceolate in face view, 15-23 by 60-90 /*; 

 Hnear-rhomboidal in side view, 13-19 fi thick, the outer wall rather 

 thin, about 1.5 fx, smooth, the inner and side walls moderately thick, 

 3-5 fi, rather densely rugose with ridges of varying length ; secio- 

 spores globoid or broadly ellipsoid, 15-19 by 18-25 /x; wall light 

 chestnut-brown, 1.5-2 fx thick, finely verrucose, the pores distinct, 

 6-8, scattered." On Malus sp. 



"Telia caulicolous, from a perennial mycelium, appearing on ir- 

 regular globoid gall-like excrescences 3-25 mm. in diameter, unevenly 

 disposed, sometimes densely aggregate, often separated by the scars 

 of the sori of previous seasons, tongue- or wedge-shaped, becoming 

 about 1.5-3 mm. broad by 2-5 mm. long at the base by 6-12 mm. 



