78 Bulletin 313 



Sph^ropsis malorum Peck. (= Physalospora cydonicE, page 

 46). — On apple, quince, pear and hawthorne. Causes cankers on 

 twigs, branches and sometimes on the trunks; the black rot of the 

 fruits and a spotting of the leaves. The pycnidia somewhat variable 

 and more abundant on the fruit than on stem cankers. They may 

 be simple or compound, erumpent, surrounded by the broken epider- 

 mis, 200-460 X 200-720 /x. 



437. Infected fruit of apple. 438. Infected branch of apple. 439. Spores 

 from apple fruit, 1/12. 440. Spores from quince, 1/12. 441. Spores from 

 flowering crab, 1/12. 442. Spores from apple twig showing Diplodia charac- 

 ter, 1/lZ 



Note : — We have found what appears to be 5". malorum on the 

 young shoots of ^the peach. These cankers originate as small brown 

 spots, enlarge, become irregular in outline, depressed and split 

 lengthwise. The twigs are frequently bent and in advanced stages 

 a gum is exuded. Pycnidia numerous, erumpent, ostiolate, black, 

 spores oblong to ovate, sometimes truncate at point of attachment. 

 18.8-28.2 X 11.6-13.3 fi. 



Note: — Bartholomew's "Fungi Columbiani" has specimens 1590 

 labelled Sphcuropsis persiccB E. & B. in which the spores are 2-celled 

 and apparently belong to Diplodia persicce Sacc. Hesler reports the 

 ascogenous form on Hamainelis virginiana L. and Qiircus alba L. 

 (See Phytopathology, v. 3, p. 290-295 (1913) and Cornell Univ. 

 Agr. Exp. Sta. Bui. 379.) 



443. Cankers on peach twigs. 444. Pj^cnidium, 2/3. 445. Spores, 1/12. 



Sph^.ropsis SYRiNGiE (Fr.) Peck & Cke. — On the leaves and twigs 

 of the Syringa vulgaris. Causes more or less frequently confluent 

 spots. Pycnidia, black, grouped, slightly erumpent, sub elliptical, 

 depressed, rugulose, ostiolium, delicate; spores brown, oblong, 

 2-24 X 10-11 ya. 



446. Infected leaf of Syringa vulgaris. 447. Spores, 1/12. 



