366 THE FUNGI WHICH CAUSE PLANT DISEASE 



III. Telia caulicolous, appearing on long fusiform swellings of 

 various sized branches, numerous, scattered, or sometimes aggre- 

 gated, cylindric, or slightly compressed, 5-10 mm. long by 0.8-1.5 

 mm. in diameter, acutish, or sometimes forked at the apex, 

 brownish-yellow; teliospores 2-celled, lanceolate, 13-20 x 40-80 /x, 

 occasionally longer, rounded or narrowed 

 above, usually narrowed below, very 

 slightly or not at all constricted at the 

 septum, wall golden-yellow, thin, about 

 1 ju; pores 2 in each cell, near the sep- 

 tum. 



I. ^cia on Crataegus spp., Amelanchier, 



Aronia, Cotoneaster, Cydonia, and Pyrus. 



III. Telia on Jimiperus communis, J. 



Fio. 266. — Gymnosporan- oxycedrus, and J. sibirica. Spindle-shaped 



&mtSS™'Af^ swelUngs occur on Juniper branches. 



Richards. Cylindric spore-masses ooze through rifts 



in the bark. iEciospores shed in June germinate at once on Juniper 



twigs and result in the following year in swellings which often 



later cause death. In spring the spore-masses emerge and the 



teliospores germinate in situ. Upon the Rosaceous hosts spots 



appear eight to fourteen days after infection. Kienitz-Gerloff 



reports the occasional formation of a germ tube instead of a 



promycelium. This is, however, to be regarded as an abnormal 



condition. 



G. globosum Fari. ^ "3. 216. 216 



O. and I. .^cia chiefly hypophyllous and crowded irr^ularly 

 or rarely in approximately annular groups 2-7 mm. across, cylin- 

 dric, 1.5-3 mm. high by 0.1-0.2 mm. in diameter; peridium soon 

 splitting in the upper part, becoming reticulate half way to base; 

 peridial cells seen in both face and side views, broadly lanceolate 

 in face view, 15-23 x 60-90 /i, linear rhomboid in side view, 13-19 m 

 thick, outer wall about 1.5 /x thick, smooth, inner and side walls 

 3-5 fi, thick, rather densely rugose with ridge-like papillae of 

 varying length; seciospores globoid or broadly ellipsoid, 15-19 x 

 18-25 ti, wall light chestnut-brown, 1.5-2 m thick, finely verru- 

 cose. 

 III. Telia caulicolous, appearing on irregular globoid, gall-like 



