Ill NATURAL HISTORY BULLETIN. 



This species is one of very frequent occurrence in North 

 America. The spots found upon some of its hosts are of 

 rather definite outline 2-6mm: on others irregular and conflu- 

 ent, covering perhaps % of the leaf's surface, which appears 

 deeply blistered and of a bluish-grav color. 



There is no uniform development of the asci, but upon a 

 number of hosts they are amphigenous; they are club-shaped, 

 rounded at the top; size. 15-25x40-80//; they have one or 

 more processes, which penetrate between the epidermal cells 

 from 10 20/; the longer ones are quite slender, and have two 

 or three to one ascus; the short are somewhat blunt, and 

 have only one to an azcus. 



There is no differentiation of a stalk-cell. The spores are 

 very numerous and minute, the presence of veast-like conidia 

 in great numbers renders the measurement of the spores very 

 uncertain and of little value. I have found this species upon 

 ^ici'cus coccinea \ar, tinctoria from Massachusetts, collected 

 by Mr. A. B. Seymour and from Mississippi by S. M, Trac}'. 

 ^ falcata, Auburn, Ala., Geo. F. Atkinson. J^. alba. Con- 

 necticut. Prof. R. Thaxter. .i^ coccinea. Wisconsin. ]Mr. Sey- 

 mour. J^. -phcUos. Alabama, Geo. F. Atkinson. ,^. doug- 

 lasii, California, Dr. H. W. Harkness. J<^. aquatica and J^. 

 l(2rifoIia, Starkville, Miss., S. M. Tracv; and J^ nigra. Illinois, 

 F. S. Earle. It is reported upon J^. ci)ierca and ^ nihra^ 

 Prof. L. H. Pammel sent me what is supposed to be the latter 

 collected at Kirkland. Wis., and Dr. H. W. Harkness J^. agri- 

 folin which doubtless bears T. ccpnilcscois. but the fungus is 

 not in good condition for determination. Dr. H. W. Harkness 

 has also sent me diseased leaves of Castanopsis; upon the 

 affected areas which ma^• constitute ^ the leaf surface, the 

 asci are closelv crowded together: the}' are in size near the 

 minimum measurements of T. coeridescens and have only one 

 process extending verv slighth' between the epidermal cells, 

 but there seems to be no differences of sufficient importance 

 to constitute even a varietx of the species under consideration. 



Upon ^icrcits niacrocarp>a. collected at Brandon, Wis., I 

 hoped to tind the Tafhrina cxtcnsa described by Peck '87. 



