74 A PLANT-DISEASE SURVEY IN TEXAS. 



Eye-spot {Cercospora moricola Cke.). — This fungus produces cir- 

 cular or subcircular spots 3 to 7 mm. in diameter on the leaves. The 

 center is tan colored, with a very dark outer zone and outside of this 

 a halo of A'ellowish brown, paling out into the green. (PI. XIII, fig. 

 2.) The conidiophores, densely tufted, pale yellow, 20 to 25 by 3 to 

 3.5 /i, are on the lower surface. The conidia are clavate, 30 to 75 by 

 4 to 4.5 /A, slightly colored, two to eight septate, guttulate. (PI. IV, 

 fig. G.) This is a common disease on both wild and cultivated forms. 



Specimens collected : On Alorus rubra L. — Llauo, 1747 ; Luling, 2273 ; Seguin, 

 2282 ; Victoria, 2512 ; Nursery, 2558, 2568 ; Stockdale, 2607 ; Hallettsville, 2796. 



Leaf-spot {Cercospora missouriensis Wint.). — Large, orbicular, 

 dark-brown spots are formed on the leaves. They vary in size from 

 3 to 7 mm. and usually have a slightly darker border. The coni- 

 diophores are borne on the lower surface in dense tufts. 



This species is listed by Saccardo (44) under C. pulvinulata Sacc. 

 and Wint. 



Specimens collected : On Morus rii'bra L. — Austin, 465, 469 ; Beeville, 1844 ; 

 Falfurrias, 2459; Cuero, 2597; Floresville, 2842. 



leaf -spot {Cercosporella mori Pk.^). — This diseased condition of 



the foliage is characterized by the formation of irregular, circular 



or angular spots 1 to 8 mm. in diameter. The areas are brown in 



color, with a darker border. A conspicuous cushionlike cluster of 



white or j^inkish conidia is extruded near the center, or they may 



be scattered over the surface of the spots. These acervuli are for the 



most part on the under surface of the leaf, and are 50 to 100 /a in 



diameter. The conidiophores are faintly smoky. The conidia are 



slightly clavate, several septate, hyaline, 35 to 75 by 3 to 4 /x. (PI. 



VII, fig. 8.) 



Specimens collected: On Morus alba L. — New Braunfels, 1684, 1721; Beeville, 

 1832; Seguin, 2330; Austin, 3184. 



OAK. 



Ball moss {Tillandsia recurvata L.). — This lives epiplMically on 

 the oak {Quercus spp.) throughout the entire range except the ex- 

 treme western and northwestern portions covered by this survey. It 

 is quite commonly considered as parasitic, since it occurs so abun- 

 dantly and is so apparent on dead trees. Death is probably due to 

 shading of the foliage in addition to edaphic and climatic factors. 



leaf -spot {Marsonia quercus Pk.). — The spots, 1 to 2 mm. in diame- 

 ter, are whitish or grayish brown above and brown below. The areas 

 are often bordered by a narrow purplish zone. 



• Specimens collected: Elgin, 2008; Victoria, 2502; Stockdale, 2644; Flatonia, 

 2735. 



1 This fungus has hcen determined as Cercosporella mori nov. sp. by Prof. C. H. Pecli, 

 to whom specimens were sent for identification. 

 22« 



