Wakker, J. H. 



1892.— Untersuchungen fiber den Einfluss parasitischer Pilze auf ihrer Nahr- 

 pfanzen—Roestelia lacerala auf Crataegus. Jahrb. f. wissenshaftliche 

 Bot. 24: 499-544 (pp. 5"-5i3)- 

 Whetzel, H. H. 



1903.— Notes on Apple Rusts. Proc. Ind. Acad. Sci. 1902: 255-261. 

 Woernle, P. 



1894.— Anatomische Untersuchung der durch Gymnosporangium-Anen hervor- 



Yamada, G., and Miyake, I. 



1908.— Eine neue Gymnosporangiuman. Bot. Mag. Tokyo 22 1 : 21-28. 

 Explanation of Illustrations 

 Text-Figures 

 Fig. 1. Full explanation included with it. 



Figs. 2-36. The names are given under each figure. The drawings were 

 outlined with the aid of a camera lucida at a uniform scale and were reduced equally 

 in reproduction, representing approximately a magnification of 350 diameters. 

 In all drawings of peridial cells the end which is uppermost is the upper end of the 

 cell, or the end which is toward the apex of the peridium. In all peridial cells 

 except those in figures 3 and 31 the inner wall is the thicker. In figures 8, 31, 



Fig. 39. G. cornutum on Sorbus americana; elongated aecia, the peridiur 

 taining its tubular or cornute form after dehiscence. 



Fig. 40. G. corniculans on Amelanchier irecta; elongated aecia, the peri< 

 retaining its tubular or cornute form after dehiscence. 

 Plate 153 



Fig. 41. G. germinal, on Cydonia vulgaris; elongated aecia, the peridium 

 becoming deeply lacerate, erect or spreading. After Stewart. 



Fig. 42. G. Juniperi-virginianae on Mains Mains (fruit); elongated aecia 



elongated, appearing on galls like the telia. 



Plate 154 

 Fig. 44. G. Blasdaleanum on Heyderia decurrens; telia foliicolous, not cat 



usually caulicolous, see PL 160, j. 62, 63. After Oersted (1866 1 pi. 3.}. 1). 



