APPENDIX. 



The genus Tylostoma seems to be the most plastic, and is the most difficult 

 genus in the puff ball world. Many collections reach us that we do not feel 

 justified in naming, either because the specimens are old and characters have 

 disappeared, or they do not accord with any species that we know. Some of 

 them are strongly marked, but we feel it is not advisable to unduly multiply 

 the species nor to base "new species" on a single collection unless it is ample in 

 number and presents marked characters. 



At the present time the following collections remain unnamed in our museum : 

 W. H. Long, Texas (13) ; T. L. Mead, Florida (2) ; Geo. G. Hedgcock, Missouri 

 (1); F. K. Vreeland, Colorado (1); F. K. Vreeland, New Mexico (2); 

 D. Griffiths, Arizona (2) ; R. H. Stevens, Colorado (1) ; J. M. Bates, Nebraska 

 (1) ; Chas. Mcllvaine, New Jersey (1) ; John W. Harshberger, Pennsylvania 

 (1) ; W. S. Moffatt, Illinois (2) ; C. F. Brown, Wisconsin (1) ; Minn. Bot. Survey, 

 Minnesota (1): J. G. Lamison, Ohio (1); W. C. Dawson, Ohio (1); L. R. 

 Waldron, North Dakota (1) ; S. B. Parish, California (4) ; Mrs. Blanche Trask, 

 California (1); L. A. Greata, California (1). Total, 38. 



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