270 



Mycologia 



would tend to increase the number of tyloses. Whether the 

 presence of a considerable decayed area would occasion any re- 

 duction of the pressure in the vessels and thus result in the great 

 increase in the number of tyloses which occurs, is by no means 

 certain but it seems to offer the only explanation of this inter- 

 esting condition. 



Kansas State Agricultural College, 

 Manhattan, Kansas. 



Literature Cited 



1. Bayliss, J. S. Biology of Polystictus versicolor. Journ. Econ. Biology 2: 



1-22. 1908. 



2. Hall, William L. The Hardy Catalpa in Commercial Plantations. Bureau 



of Forestry Bull. 27: 1-48. 1902. 



3. Hartig, R. Wichtige Krankheiten der Waldbaume. 



4. Hartig, R. Text-book of the Diseases of Trees. English edition. Lon- 



don. 1894. 



5. Rees, Max. Zur Kritik der Bohni'schen Ansicht uber die Entwicklungs- 



geschichte und Funktion der Tyllen. Bot. Zeit., p. i. 1868. 



6. Sorauer, Paul. Schutz der Obstbaume, Gegen Krankheiten. Stuttgart. 



1900. 



7. Stevens, Neil E. Wood Rots of the Hardy Catalpa. Phytopathology 2: 



114-119. 191 2. 



8. Von Schrenk, Herman. The Diseases of the Hardy Catalpa. Bureau of 



Forestry Bull. 37: 49-58. 1902. 



Explanation of Plates LXXIV and LXXV 



Figs. I and 2. Sections of a large six-year-old catalpa sprout on a stump 

 which bore sporophores of Polystictus versicolor. The section shown in fig. i 

 was taken two feet from the stump, and that shown in fig. 2, six inches from 

 the stump. XH- 



Fig. 3. Section of the base of a small catalpa stump which bore sporo- 

 phores of Coriolellus Sepium and had produced a normal coppice shoot. X^. 



Fig. 4. Section of the base of a catalpa stump which bore sporophores of 

 Polystictus versicolor and had produced a normal six-year-old coppice shoot. 



