NORTH AMHRICAN rARASITIC EXOASCE.E. ny 



£.xoasnis polciililhc Saccarclo "89. 



Mcioiiiisiclhr polciitilhc { Faiiow ) Sadebeck '93. 



This species causes 3ello\vish and purple spots upon the 

 leaves. I have seen no distortion of petioles as described b} 

 johanson on Potent ilia toruicntilla. The vegetative m3'ce- 

 lium spreads within the inner tissues and sends as branches to 

 the surface the ascogenous cells. There is no stalk-cell 

 although what has a verv similar appearance is but a pro- 

 longed stem-like portion of the ascus below the swollen upper 

 part containing the spores. The asci are amphigenous, club- 

 shaped, generally rounded at the apex, size 8-10 X 40-5 5« , 

 one half of this length may be below the cuticle. The spores 

 are about 4" in diameter; conidia numerous. 



This species is common in Massachusetts. I have examined 

 affected Potent ilia caiiadoisis collected at Hull, and Sherburne, 

 Mass., by Mr. A. B. Se3'mour; Manchester. Mass.. bv W. C. 

 Sturges; and at Newton, Mass.. b}- Dr. W. G. Farlow. Mr. 

 B. L. Galloway sent me similar material that had been col- 

 lected at Glen Echo Falls, Md. 



Magnusiella fla\'A (Parlozi') Sadebeek. Plate YV . Fig. 4. 

 Bibl. and Syn. : 



JS.xoaseiis flazwis Farlow, 



Ellis '79. 

 Farlow '83. 



TapJiriiia fara Farlow. 



Farlow "S3. baccardo '89. 



Robinson '87. Sadebeck 90. 



Seymour & Earle '92. 



Magunsiella -jlaz-a (Farlow) Sadeb. 



Sadebeck '93. 



This species causes earh- in the summer small light yellow 

 spots to appear upon the leaves. The asci are upon both 

 sides closely pressed together, rectangular in shape with trun- 

 cated ends; they are attached to the sub-epidermal mycelium 

 by verv slender pedicels, not cut off as stalk-cells; the upper 



