22 Bulletin 313 



ScLEROTiNiA FRUCTIGENA (Pcrs.) Schr.^ — On the fruit, flowers, 

 leaves and stems of peach, plum and cherry, and other drupaceous 

 fruits. Causes a rotting of the fruit; dying of blossoms, young 

 twigs and young shoots early in the season; and the formation of 

 cankers on the twigs and smaller branches. The conidial stage 

 {Monilia fructigena Pers., page 114) is most conspicuous on fruits, 

 many of which cling to the tree as mummies. The conidiophores 

 and conidia in mass appear as a dense gray, brownish or ochraceous 

 mold-like growth. The conidia measure about 20.9 x 12.1 fi. The 

 apothecia are rare in New Jersey. They are produced from the 

 sclerotia on the fallen mummied fruits and measure about 0.5-3 cm. 

 in height; the stem is dark brown and the disk somewhat lighter 

 and measures about 5-8 or occasionally as much as 15 mm. in diame- 

 ter; asci 125-215 x 7-10 [x; ascospores ellipsoidal and 10-15 x 5-8 fi. 



63. Infected peach twig showing cankers. 64. Chain of conidia, 1/6. 65. 

 Same, 1/12. 66. Germinating conidia, 1/6, 1/12. 67. Apothecia from mum- 

 mied fruit. 68. Ascus, 1/12. 



PsEUDOPEZiZA MEDiCAGiNis (Lib.) Sacc. — On leaves of alfalfa. 

 Causing irregularly distributed circular, yellowish to brown or 

 black spots which are visible on both surfaces of the leaf but most 

 prominent on the upper ; boundary slightly irregular and not sharply 

 defined; varying from mere specks to about 1.5 to 2 mm. in diame- 

 ter. The spots appear early in the season but the apothecia are 

 rather slow in forming and are usually most abundant in the fall. 

 The apothecia are very small, amber or black shiny elevations. The 

 asci are elongated and contain 8 spores ; the paraphyses are filiform 

 to clavate; the spores are hyaline, non-septate, elliptical and 8-11 x 

 4-6 IX. 



69. Infected leaf of alfalfa. 70. Surface view of the apothecia, 2/3. 71. 

 Cross-section of same, 2/3. 72. Asci, 1/12. 73. Ascospores, 1/12. 74. Para- 

 physes. 1/12. 



PsEUDOPEZiZA RiBis Kelb. (=: GloeospoHum ribis (Lib.) M. & D., 

 page 102). 



PsETJDOPEZiZA SALicis (Tul.) Pot. (= Glooosporium salicis West, 

 page 102). 



PSEUDOPEZIZA TRiFOLiT (Pers.) Fckl. — On leaves of clover. 

 Causes brown or yellowish-brown oval or irregular spots, some- 

 times with light centers, and about 0.5 mm. in diameter. Conidia 

 in numerous small, light-brown cup-shaped pycnidia, and are ovoid- 

 oblong and 5 [x, bi-guttulate ; asci and ascospores similar to those of 

 P. medicaginis and measure about 10-14 x 5-6 fi. x\scocarps de- 

 velop on the dead spots ; ascospores elliptic, 10-14 x 5-6 /x. 



75. Infected leaf of clover. 76. Asci and paraphyses, 1/12. 77. Asco- 

 spores, 1/12. 



