78 Bulletin 313 



Sph^ropsis malorum Peck. (^ Physalospora cydonico, page 

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

 tvv'igs, 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, 1/12. 



Note: — We have found what appears to be S. 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, erimipent, ostiolate, black, 

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

 18.8-28.2 X 11.6-13.3 p.. 



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

 labelled Sphccropsis persicce E. & B. in which the spores are 2-celled 

 and apparently belong to Diplodia persicce Sacc. Hesler reports the 

 ascogenous form on Hamamelis virginiana L. and Qtirciis 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 syringe (Fr.) Peck & Cke. — On the leaves and twigs 

 of the Syringa vulgaris. Causes more or less frequently confluent 

 spots. Pycnidia, black, grouped, slightly erumpent, subelliptical, 

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

 2-24 X 10-11 II. 



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



