158 



Mycologia 



branchlets usually become more subulate, resembling those of 

 the younger growth (see Fig. 3). In having small and incon- 

 spicuous sori, it resembles G. Nelsoni, G. multiporum and G. 

 inconspicuum. The telia of the new species in germination be- 

 come obliquely conic ; of G. Nelsoni Arth., hemispheric ; and of 

 G. multiporum Kern, ellipsoid-hemispheric. The sori of G. 

 inconspicuum appear as a faint brownish line encircling the 

 scales, until diliquescence, when they spread out as a thin, yel- 

 lowish film. In spore characters, also, the new species differs 

 from the above named species (see Fig. 1) ; G. multiporum has 



Fig. 1. Teliospores of (a) Gymno sporangium Kernianum, (b) G. multi- 

 porum, (c) G. Nelsoni, (d) G. inconspicuum, drawn to the same scale, ap- 

 proximately X 475- 



four scattered germ-pores, G. inconspicuum^ one in each cell, 

 apical in the upper and near the pedicel in the lower ; G. Nelsoni 

 has one or two germ-pores in each cell near the septum as in the 

 new species, but the spores are much smaller, 18-26 X 39—52 

 and broadly ellipsoid, with pedicel inflated at juncture with spore. 



There are no clues as to its roestelial connection, though it 

 probably belongs to Amelanchier and Peraphyllum, which form 

 extensive chapparal around the infected trees. 



It is with especial pleasure that this species is dedicated to 

 Prof. Frank D. Kern, who, through extensive observations in 

 the field and painstaking culture work, has rendered invaluable 



a 



b 



c 



d 



