358 Report of thk JIokticulturist of the 



Another species, N. ditissima, is the common canker-producing 

 fungus of the orchard trees in many parts of Europe. !N'either of 

 the species is suflEiciently abundant in the orchards of the United 

 States to be regarded as a pest. 



The illustration in Plate XXXIII, fig. 2, is from a photograph 

 of one of a few quince tree limbs attacked by N. cinnaharina that 

 were found in the quince orchard of T. C. Maxwell and Brothers, 

 Geneva, X. Y. 



ACKNOAVLEDGMENTS. 



It is with pleasure that I acknowledge my indebtedness to 

 Prof. Beach, at whose earnest request this work was undertaken, 

 and to whose kind consideration its completion was made pos- 

 sible. To Dr. Thaxter I am indebted for advice on the question 

 of nomenclature and to Mr. Ellis for the determination of species. 



explanatio:n^ of plates. 



Plate XXVIII. Eig. 1. — A cankered apple tree limb, wood 



exposed at a and white fruiting bodies 

 of Schizophyllum commune Fr. are con- 

 spicuous on the dead hark. A canker of 

 more recent formation is shown at b. 

 Eig. 2. — The same limb as in Fig. 1 with the 



dead bark removed. 

 Fig. 3. — A larger view of the small canker 

 shown at b. The surface is thickly dotted 

 ivith pycnidia. 

 Fig. 4. — Small section of dead bark from 

 canker in Fig. 3 showing pycnidia natural 

 size. 

 Plate XXIX. — Different forms of cankers. Fig. 1 shows limb 



that for more thorn, six feet is covered with 

 rough bark, or scars where bark has become 

 detached; fungus has reached cambium at a. 



