362 PROCEEDINGS OF THE ACADEMY OF [May, 



EXPLAXATIOX OF PlATES XVI AND XVII. 



Plate XVI. — Stem of the waxberry, Myrica cerifera, with secondary roots upon 

 which are formed the mycodomatia, or mycocecidia. Photograph 

 by Mr. W. H. Walmsley. 



Plate XVII, fig. 1. — Transverse section of a branch of a mycodomatia made 

 below the middle showing large lacunar areas, magnified 25 diameters. 



Fig. 2. — Cortex of mycodomatium showing large thick-walled unicellular 

 hyphte. 



Fig. 3. — Meshed structure of finer hyphfe from mediocortex. 



Fig. 4. — Coarser hyphte at the base of a mycodomatial branch. 



Fig. 5. — Older normal secondary root of the waxberry showing central 

 woody cylinder, etc. 



Fig. 6. — Finer hj^jhte with one cell at a showing meshed structure suggestive 

 of a collection of zooconidia. At h finer hyphaj are sho^vn. Photo- 

 graphs by Mr. W. H. Walmsley. 



