370 THE FUNGI WHICH CAUSE PLANT DISEASE 



The telial mycelium is peremiial and causes swellings. From 

 these in spring ooze the gelatinous, transparent spore-masses. 



The mycelium in Juniperus causes increase in wood-bast and 

 rind, thickened twisted tracheids, increase in number and thick- 

 ness of the medullary rays. No mycelium is found in the wood 

 itself. 



6. biseptatum Ell. 



I. iEcia (=Roestelia botryapites) hypophyllous, usually in 

 groups of 2-8, rarely solitary, borne in gall-like pyriform protuber- 

 ances 1-1.5 mm. in diameter by 1.5-3 mm. high, cylindric, 0.5-0.8 

 mm. in diameter by 2-4 mm. high; peridium soon becoming finely 

 cancellate, not dehiscent at apex; peridial cells cylindric, hyphal- 

 like, 9-14 /x in diameter by 145-190 n long, often irregularly bent, 

 outer, inner, and side walls of equal thickness, about 1.5-2 n, 

 whole surface smooth; aeciospores globoid, small, 15-17 x 16-22 n, 

 wall dark cinnamon-brown, rather thick, 2.5-3 fi, moderately 

 verrucose. 



III. Telia caulicolous, appearing on fusiform swellings, scattered, 

 oval or irregular, about 1.5-3 mm. wide by 2-7 nam. long, often 

 confluent, hemispheric, chestnut-brown; teliospores 2 to 4-celled, 

 13-19 X 35-77 M, usually rounded above, somewhat narrowed be- 

 low, slightly constricted at the septa, wall pale-yellow, 1.1-5 m 

 thick, pores 2 in each cell, near the septa. 



I. iBcia on Amelanchier. 



III. Telia on Chamsecyparis. 



G. nelsoni Arthur, ^cia hjrpophyllous and fructicolous, usually 

 in small groups 1-2 mm. across, cylindric, 2-4 nun. high by 0.2- 

 0.3 mm. in diameter; peridium whitish, dehiscent at apex and 

 also rupturing more or less along the sides; peridial cells seen in 

 both face and side view, 18-35 x 75-115 ii, linear rhomboid in side 

 view, 16-35 fi, thick, outer wall rather thin, 1.5-2 n, smooth, 

 inner and side walls rather thick, 7-12 n, evenly and densely 

 verruculose; seciospores globoid, 19-26 x 21-29 /i, wall chestnut- 

 brown, 2-3 M thick, finely verrucose. 



III. Telia caulicolous, appearing on firm, woody, globose galls 

 0.5-5 cm. in diameter, unevenly disposed, densely aggregated or 

 often separated by the scars of the sori of previous seasons, ir- 

 regularly flattened, about 1-1.5 mm. broad by 1-5 mm. long at the 



