102 Bulletin 313 



Glceosporium ribis (Lib.) M. & D. (= Pseudopeziza ribis Kleb., 

 page 22). — On the leaves of the currant and gooseberry, sometimes 

 on petioles, young canes and fruits. Causes small, reddish-brown, 

 sometimes coalescent, spots and finally the yellowing and falling of 

 the leaves. Acervuli abimdant on upper surface, and sometimes on 

 lower surface, stromatic, sub-epidermal; conidia pinkish in gela- 

 tinous mass, hyaline, elliptical, curved, 12-24 x 5-9 /x. 



618. Infected gooseberry leaf. 619. Infected currant leaf. 620. Part of same 

 enlarged. 621. Spores, 1/12. 



Glceosporium rufomaculans (Berk.) Thum (= Glomerella 

 rufomaculans (Berk.) S. & S., page 50). — On apple and other poma- 

 ceous plants. It also attacks grape, tomato, eggplant and other 

 plants. Causes a brown, sunken, rotten area on the fruit from which 

 the acervuli are developed. It also attacks the branches of the apple 

 causing well-defined cankers. The acervuli on the fruit are prom- 

 inent, arranged more or less in circles, and the emerging spores 

 pinkish or orange-colored in mass, spores hyaline to greenish, uni- 

 cellular, 28 X 3.5-7 /x. Perithecia more or less grouped on the fruit; 

 asci sub-clavate, 55-70 fi ; ascospores allantoid, 12-22 x 3-5 fx. 



622. Acervulus, 2/3. 623. Spores, 1/12. 



Glceosporium salicis West {^= Pseudopeziza salicis, page 22). — 

 On the leaves of the willow. Causes small brown or black spots on 

 the upper surface, frequently becoming confluent and causing defoli- 

 ation. Acervuli abundant on the upper surface, spore tendrils white, 

 spores oblong, non-septate, slightly curved, guttulate, hyaline, 11-15 

 X 4-6 /i. 



624. Infected Avillow leaf. 625. Spores, 1/12. 



Glceosporium venetum Speg. — On the canes, petioles and leaves 

 of species of Rubus. Causes more or less circular or elongated ptu"- 

 plish spots, centers becoming gray and sunken, giving the bird's-eye 

 efifect, and mostly confluent, 2-3 mm. in diameter ; conidia amber- 

 colored in mass, oblong, elliptical, 5-7 x 3 /x. (= Plectodiscella ven- 

 eta Burk. In Phytopathology, v. 7, p. 83-91, 1917.) 



626. Infected dewberry cane. 627. Spores from black-cap raspberry, 1/12. 

 628. Spores from Welsh raspberry, 1/12. 



Colletotrichum antirrhini Stewart. — On the stem and leaves 

 of the cultivated snapdragons. Causes circular, elliptical, often con- 

 fluent, dark brown spots, 3-10 x 3-5 /i. Acervuli numerous and 

 grouped (especially on the stem) ; setse abundant, especially on the 

 stems, dark brown, unbranched, tapering, 50-100 fx long; conidia ob- 



