Description of the Figures. xiii 



FIG. 



106. The same, showing the escaping zoogonidia forming 



a cluster at the apex of the zoosporangium, X 

 400. 



107. Zoogonidia of same, x 750. 



108. Oogonia and antheridia of same, X 390. (After De 



Eary.) 



109. Sorosporium saponarice, cluster of spores, x 520. 



(After Woronin.) 



110. Spore of same germinating, x 520. (After Woronin.) 



111. Thecaphora hyalina, spore-cluster, one of the spores 



germinating, X 520. (After Woronin.) 



112. Tuhurcinia tri<mfalis, 8b giow]) of gonidiophores emerg- 



ino- into the air through the stoma of a leaf of 

 Trientalis europcca ; a, «', haustoria on the mycelium ; 

 h, guard-cells of the stoma; x 520. (After Woronin.) 



113. Spore-cluster of same, some of the spores have 



germinated ; «, promycelium ; 5, primary sporidia ; 

 X 520. (After Woronin.) 



114. Primary sporidia of same giving origin to, a, «, secondary 



sporidia ; X 520. (After Woronin.) 



115. Primary sporidium, a, of same that has given origin to, 



h, a secondary sporidium, the latter in turn has 

 produced a tertiary sporidium, c, X 520. (After 

 Woronin.) 



116. Etijloma ranunculi, gonidiophores emerging into the air 



through a stoma of the leaf of Ficaria ranunculus, 

 X 500. 



117. Kesting-spores of same in various stages of development, 



X Zeiss J. (After Ward.) 



118. Doassansia alumatis, portion of a fructification ; a, 



sterile cells of fungus arranged in a palisade-like 

 manner and forming a receptacle ; h, mass of fertile 

 spores ; x 500. 



119. Spore of same germinating ; a, promycelium; h, apical 



group of primary sporidia, highly X , (After 

 Cornu.) 



120. Udilago tragopogi, resting-spores germinating ; «, a, 



primary sporidia produced by the promycelium, x 

 460. (After Tulasne.) 



