Explanation of Plates 383 



Lower figure (2). Godronia sororia. Photograph of piece of bark with 

 apothecia, about natural size. Above, two apothecia, much enlarged. Right, 

 ascus with spores. Below, two loose spores and portion of two hairs from 

 apothecium. 



Plate 140 (P. 336) 



Pezicula carpinea. Photograph of branch showing apothecia, consider- 

 ably reduced. To the left, sketch of apothecia with an ascus with spores and 

 paraphyses. To the left, pycnospores in various stages of development. 



Plate 141 (P. 338) 

 Upper figure (1). Pezicula acericola. Near the center photograph of 

 bark showing apothecia, about natural size. To the left, an ascus with spores 

 and paraphysis and the end of a ruptured ascus. Upper right-hand corner, 

 sketch of Sphaeronema acericola. Lower right-hand corner, stroma showing 

 both apothecial and conidial stages produced on the same stroma. 



Lower figure (2). Pezicula splculata. Near the center, photograph of 

 bark showing apothecia and p\cnidia, about natural size. Upper left-hand 

 corner, sketch of stroma showing apothecia and pycnidia and pycnospores. 

 Right-hand side, an ascus with spores and paraphysis. Below, drawing of 

 mature ascospores. 



Plate 142 (P. 340) 



Pezicula cornicola. Photograph of two branches showing apothecia. 

 Above, sketch of apothecium, much enlarged. Center, an ascus with spores. 

 Above right, two ascospores. Below, a stroma with e.xuding conidiospores. 

 Below right, two conidia. 



Plate 143 (P. 344) 



Pezicula Corni. Center, photographs of several twigs showing apothecia. 

 Above, sketch of two apothecia, much enlarged. Background, drawings of an 

 ascus with spores; also two spores removed and the end of a ruptured ascus. 

 Below, drawing of a sorus and two conidia. 



Plate 144 (P. 346) 



Upper figure (1). Pezicula ocellata. Photograph of willow branches 

 showing apothecia, enlarged about one-third. Above, drawing of two apo- 

 thecia, enlarged. At the left, an ascus with spores and paraphysis. Below, 

 drawing of conidia in various stages. Photographed from material collected 

 in Colorado by F. J. Seaver and Ellsworth Bethel in 1910. 



Lower figure (2). Pezicula Populi. Photograph of branches of poplar 

 bearing apothecia, enlarged about one-third. Below, drawing of several apo- 

 thecia, enlarged. At the right, drawing of an ascus with spores and paraphy- 

 ses; also two ascospores, isolated. Photographed and drawn from type 

 material collected in Ontario, Canada, by G. E. Thompson in 1930. 



Plate 145 (P. 348) 



Pezicula purpurascens. Photograph of chestnut branches bearing apo- 

 thecia and conidia, about natural size. At the left, drawing of an ascus with 

 spores and paraphyses. Above, drawing of one apothecium, enlarged; also 

 two ascoconidia. Below, several ascoconidiophores showing stages in the 



