188 Griffiths: Common Parasite of Po\vdery Mildews 



Explanation of Plate 358 



1. rycaidium produced in conidiophore on Grinddia. All remains of the conidio- 

 phore have disappeared, hut the mycelium of Am^elomyces can be seen within the 



mycelium of the Erysiphc. 



2. The same with the remains of the conidiophore. 



3. rycnidhun of C. cokmeitsV^^^. (Thucmen, jNIycotheca Universalis, no. 1668). 



4. Pycnidium on Grindelia. 



5. Tycnidium of C, humulis Faut. from duplicate of the original material 



(Roumeguere, Fungi Sel. Gal. no. 5461). 



6. Pycnidium evidently developed in the upper part of a conidiophore on Lygodes- 



F 



inia jitncca. 



7. Pycnidium of C, tinciuulae Faut. from duplicate of the original material 



(Roumeguere, Fungi Sel. (Jal. no. 6208). 



8. Pycnidium developed within the horizontal mycelium threads on Grindelia. 



9. Young pycnidium on Lygodesiuia juncea. 



10. Young pycnidium developing within a large perithecium on Grindelia. 



11. Pycnidium within a smaller perithecium. Tlie wall of the perithecium has 

 almost disappeared. Some of the appendages contain the mycelial threads of the 



fungus. 



12. Pycnidium developed within die perithecium, the perithecium having entirely 



disappeared. The appendages will l)e easily recognized as a development of the my- 

 celium within ihe appendages as seen in 11. 



13 and 14. ISIycelium of Ampdomyccs within the mycelium of Erysiphe dchoracc- 

 arnm on Lygodesmla juncca, the mycelium of the former growing into the haustoria of 



the latter. 



15. Spores from specimen on Grindelia. 



\h.VL)^z^X\ww\^^^ Ampdomyccs within the leaf hairs of Cydonia vu^aris Thue- 



men's Myc. Univ. no. 1668). 



NoTi-:. All drawings magnified 270 diameters except no. lo, which is magnified 



190 diameters. 



Columbia University, i March, 1899. 



1 



