50 Bulletin 313 



Glomerella rufomaculans (Berk.) S. & S. (= Gloeosporium 

 rufomaculans (Berk.) Thiim., page 102. — On the fruits aiid twigs 

 of the apple. Causes a rotting of the former and cankers on the 

 latter. The fruit rot originates as small, yellowish-brown spots 

 usually with a purplish-red border ; the spots enlarge, becoming dark 

 brown in center with light brown margins and gradually become 

 more or less simken; the twig or branch cankers are circular or 

 oblong, somewhat stmken, dry and more or less cracked. 



The acervuli {Gloeosporium fructigenwn, G. rufomaculans) ar- 

 ranged in circles and discharge an abundance of sticky, pink spores, 

 spores are variable in size and shape, 28 x 3.5-7 fx. 



The perithecia are subspherical, more or less grouped, asci sub- 

 clavate, 55-70 ix ; ascospores 12-22 x 3-5 /a. 



229. Infected apple. 230. Conidia from fruit, 1/12. 231. Conidia from 

 culture, 1/12. 232. Perithecium, 2/3, 1/6. 233. Ascus, 1/11. 234. Asco- 

 spores from same, 1/12. 



Glomerella rufomaculans vaccinii Shear. — On the upper 

 surface of leaf and on fruit of the cranberry, causing the anthrac- 

 nose disease. Acervuli small, scattered over both leaves and old 

 berries; conidiophores non-septate, tapering, 15 to 20 /x long; conidia 

 light flesh-colored in mass, oblong to elliptical, sometimes slightly 

 smaller at one end, hyaline, 12-18 x 4.5-6 p.; perithecia membranous, 

 subglobose or slightly pear-shaped; asci clavate, sessile or short 

 stipitate, 60-72 x 10-12 ^; sometimes accompanied by apparently 

 evanescent paraphyses; sometimes slightly unequilateral or curved 

 hyaline becoming pale green-yellow, 9-18 x 5-7.5 /i. 



235. ^ifycelium, 1/6. 236. Bristle, conidiophores and conidia, 2/3. 237. Coni- 

 dia, 1/12. 238. Ascus and ascospores, 1/12. 



