il4 Bulletin 313 



masses and spreading over the surface, elliptical, somewhat inequi- 

 lateral, usually 4-septate, the three central cells dark-colored, usually 

 guttulate, terminal cells hyaline; apical cell with 3 or 4 filiform 

 setae, varying from 22 to 35 [x in length ; basal cell with a short hya- 

 line appendage 6-12 jx in length. 



701. Conidia, 1/12. 



Pestalozzia rgs^ West. — On tlie dying twigs of cultivated roses. 

 Apparently a secondary parasite. Acervuli minute, white, dense; 

 conidia fusiform, smoky to olive-colored, 4-septate, 20-26.6 x 5-6.6 /x, 

 terminal cell cone-shaped and hyaline, basal cell hyaline and with 2 

 appendages. 



702. Conidia, 1/12. 



Cylindrosporium padi. Karst." — On the leaves of the wild and 

 cultivated cherry and occasionally on the fruit of the wild cherry. 

 Causes reddish-brown circular, angular, or irregular spots visible on 

 both surfaces, frequently falling away and giving the "shot hole" 

 effect ; pycnidia subepidermal ; spores yellowish-tinged, curved, 1- 

 septate, 48-60 x 2 jx. 



Note: Higgins [Amer. Jour. Bot. v., 1, p. 145-173 (1914)] says 

 that it is not known that C. padi occurs in America. He describes 

 three American species of this genus, with perfect stages belonging 

 to Coccomyces. Since the Cylindrosporium stages of these three 

 species are so nearly alike we prefer to use the C. padi until exact 

 determinations can be made. 



703. Infected cherry leaf. 704. Cross-section of acervulus. 2/3. 705. Coni- 

 dia from two sources, 1/12. 



Cylindrosporium toxicodendri* (Curtis) Dearness — On the 

 living leaves of Rhus toxicodendron and other species of Rhus. 

 Causes irregular dark brown spots, with irregular darker borders, 

 visible on both surfaces, Acervuli scattered, convex, black; conidia 

 cylindrical, straight or curved, non-septate or 1-3 septate, hyaline, 

 21-78 x 3-5 fx. 



706. Infected leaf of r<hns radicans. 707. Conidia 1/12. 



Monilia fructigena. Pers. (= Sclerotinia fructigena (Pers.) 

 Schr., page 22). 



*Syn. Septoria toxicodendri Curtis. 



Glocosporium toxicodendri E. & M. 

 Septoria toxicodendri (Curtis) E. & M. 

 Marssonina toxicodendri Magn. 



