iQoS] EDCERTON—ANTHRACNOSES 



405 



SUMMARY 



In closing the discussion of the Glomcrclla type, it may be well to 

 summarize briefly the points that have been considered. 



1. The Glomerella type is distinctly separated from the other types 

 of anthracnoses by both perfect and imperfect stages. 



2. The perfect stage seems to be distinct from nearly related 

 genera of the Pyrcnomycetes, is extremely variable, and without true 

 paraphyses. 



3. There seems to be a large number of closely related forms, 

 and they are all extremely variable. Furthermore, many forms vary 

 under artificial cultivation and doubtless under natural conditions. 

 While many of the forms may be similar enough to be considered ^he 

 same, some seem distinct enough to be considered distinct species; 

 at least the evidence is not sufficient to consider them identical. 



4. There seem to be two forms on the apple, the forms separated 

 by thermal lines. The form in the southern part of the country 

 differs in the presence of perithecia, a slightly different acervulus. 

 and entirelv different cultural characters. 



3. From the investigation it seems that too much dependence 

 should not be put on cultural characters for the determination of 

 species. Some of the char£»cters when well marked are useful, but 

 many of the others are too variable. 



In closing I wish to express my indebtedness to Professor Atkin- 

 son for aid and criticisms during the progress of the study, and to 



Professor T. J. Burrill, Dr. J. L. Sheldon, Dr. H. Hasselbrixg, 

 P. H. RoLPS, and Dr. Ernst Bessey for material for study- 



LITERATURE CITED 



1. Alwood, Wm. B., Ripe rot or bitter rot of apples. Va. Exp. Sta. Bull. 40o9~ 

 82. 1894. 



2. , Bitter rot of apples. Va. Exp. Sta. Bull. N. S. ii:no. ir. 1902, 



3. Atkinson, G. F., Anthracnose of cotton. Jour. Myc. 6:173-178. pi 18. 

 1891. 



4. , A new anthracnose of privet. Cornell Univ. Exp. Sta. Bull. 49:306- 



314. 1892. 

 5- Beaitverie, J., Ann. Soc. Bot. Lyon 26:1901. 

 6* Berkeley, M. J., Septoria rufomacidans. Gard. Chron. 1854:676. 



