New York AGrRIcuLTURAL EXPERIMENT STATION. 
355 
TapLE LII].— Present CLASSIFICATION OF SPHAROPSIS FOUND ON DIFFERENT 
Hosts. 




BS 18 6 6) ee! o Sih) OF 10) 6) 8! ¢ 6 0. & 
Pear tree twigs 
Quince tree limbs 
Black rot of apple, pear, and quince 
fruits 
Apple tree, bark 
Apple tree, decorticated wood 
Japanese plum, Prunus triflora 
Hawthorn, Crategus oxyacantha, L. 
Persimmon, Diospyros virginiana, L. 
Wildeéerap, it yrus, coronarid, L.. ...... 
mummers Rhus typhina, L. ..ss...... 
@) (O's) 9) a) ‘o.0 ot eh weer ose 6 a 6 
a.) wee bk eo eo) ee, 6) 6. as 6 B66 m8) 6 6 ie #8 
OF oe euedien.e is 0) a 6 6 6) 6./e 6.0 @ 
aes) 8 O68 
ditter sweet, Celastrus scandens, L... 
Apricot, Prunus armenica, L........ 
Choke cherry, Prunus virginiana L.. 
Hop hornbeam, Ostrya _ virginica, 
Willd. (decorticated wood)........ 
Mulberry, Morus alba, L. 
EKuropean plum, Prunus domestica, L. 
Elder, Sambucus canadensis, L....... 
Pear leaves 
ots <6 Sl Cv ub ate ae cee «© wie +. ord BD 
Spheropsis sp. Apparently same as 
on plum. 
Spheropsis cydonie, C. and E. 
Spheropsis malorum, Pk. 
Spheropsis mali (West.), Sacc. 
Spheropsis cinerea (C. and E.), Sace. 
Spheropsis sp. 
Spheropsis demersa (Bon.), Sace. 
Spheropsis sp. 
Spheropsis — New sp? 
Spheropsis sumachi (Schw.), C. and 
Hay % 
Spheropsis celastrina, Pk. 
Apparently same as on plum. 
Spheropsis cerasina, Pk. 
Spheropsis sp. 
Spheropsis mori, Berlese. 
Same as on Japanese plum. 
Spheropsis sambuci, Pk. 
Spheropsis mali, West., 
form. 
foliicolous 


A discussion of the relation of these species will be out of 
place at this time. 
However it may be pointed out that the inocu- 
lation experiments prove that the species occurring on apple-tree 
bark, S. mali, and on decorticated apple-tree wood, S. cinerea, are 
the same; also that these species are identical with the black rot 
fungus, S. malorum. Thus it will be seen that some interesting 
questions 1m nomenclature are involved. Which of these names 
should stand, if either, or whether they will all prove to be 
synonyms can only be determined after a careful study of the 
entire genus is made. 
In former papers by the writer referred to on page 333 mention 
was made of the fungus, Sphaeropsis malorum Pk., as being the 
It is there- 
fore suggested that this name be retained for the present in order 
probable cause of the New York apple-tree canker. 
that still further confusion in nomenclature may be avoided. 
BODY BLIGHT OF PEAR TREES. 
In the spring of 1898 when the preliminary studies with apple 
canker were begun a few inoculations were made in the larger 
