66 MINNESOTA BOTANICAL STUDIES- 



ly, Peck, Morgan, and Ellis. All the papers and works listed in 

 the Bibliography have also been consulted. In the synonomy all 

 references not verified are marked with an asterisk. 



The descriptions of species are based largely upon the personal 

 observations of the writer made upon the Minnesota material. Pre- 

 viously published descriptions have been used freely but only in so 

 far as they agree with the Minnesota plants. Comparisons have 

 been made with the exsiccati in the University Plerbarium and the 

 results noted in each case. Many other exsiccati were also ex- 

 amined but were not noted on account of incomplete specimens or 

 nonagreement with the Minnesota plants. In citing exsiccati, those 

 listed by Dr. Rehm are given first place. Plate references have 

 been cited wherever figures were found to agree with the IMinnesota 

 plants. The terminology of Phillips in the "Manual of British Dis- 

 comycetes" has been in large part followed. All the species de- 

 scribed, unless otherwise noted, are now in the collections of the 

 Museum and Herbarium of the University of Minnesota. They are 

 preserved both in a mixture of two per cent formalin and seventy 

 per cent alcohol and also in the dried condition. The photographs 

 were taken by Mr. C. J. Hibbard, formerly on the stafif of the Min- 

 nesota Geological and Natural History Survey. The data of col- 

 lections are given in the following order: county, date, collector,, 

 and collector's field number. 



Since the old genus Peziza has been split up into so large a num- 

 ber of genera by various authors with not even an approach to una- 

 nimity in the delineation of the new genera so founded, it has 

 been thought best to adopt Lindau's subgeneric classification as ge- 

 neric. In one instance, however, exception has been made to this, 

 rule for reasons noted under the species, viz., Urnula cratcrium 

 (Schwein.) Fr. 



In all three orders, seven families, thirty-seven genera, ninety- 

 four species with four varieties are here reported from Minnesota. 



For assistance in various ways I am indebted to the following: 

 Professor F. E. Clements, Professor E. W. D. Holway, and Profes- 

 sor F. K. Butters, of the University of Minnesota ; Dr. E. J. Durand,. 

 of Cornell University ; Dr. H. Rehm, of University of ^Munich ; Dr. 

 Bruce Fink, of Miami University; Mr. J. C. Hibbard, of Camera 

 Craft Shop, Minneapolis; Mr. H. S. Jackson, of Delaware College; 

 Dr. R. H. Denniston, of University of Wisconsin ; and Professor F.. 

 J. Seaver, of North Dakota Agricultural College. 



