60 A PLANT-DISEASE SURVEY IN TEXAS. 



back until nearly the whole leaflet is involved. The advancing edge 

 of the affected area is bordered by a narrow zone of yellow. 



The pycnidia are very abundant, brown or black, on both surfaces, 

 in surface view subcircular or somewhat irregular, 87 to 140 /a, flask 

 shaped, with a slightly protruding ostiole. Spores clear, 40 to 60 by 

 2.5 to 3 fi, straight or slightly curved, three to several septate. 



The spore measurements are identical in size with Cyliiidrospo- 

 riuTYi negundhiis Ell. and Ev. (21), and the fungus was first re- 

 ferred to this species by the writers, since the extrusion of the spores 

 from the pycnidia simulated acervuli in external appearance. An 

 examination of type specimens shows that the two species are distinct. 



This disease results in considerable defoliation, giving the tree the 

 appearance of having suffered from drought. 



Specimens collected: Beeville, 1859; Lockhart, 2060; San Marcos, 2113 

 ( type specimen ) ; Luliug. 2279 ; Seguin, 2286 ; Austin. 



BUCKEYE. 



Leaf-blight {PhyllosUcta aesculi Ell. and Martin). — Leaves of the 

 buckeye {Aesculus octandra Marsh) affected by this fungus have 

 large marginal areas of yellowish-brown or brown tissue with a region 

 of yellow toward the advancing edge so that the spots are not definite 

 margined. The pycnidia are very numerous on the low^er surface 

 and few on the upper surface. In the original description (24) they 

 are said to be hyj^ophjdlous. They are minute, measuring from 40 to 

 50 /A, dark, and contain an abundance of oblong, hyaline spores 3. to 4 

 by 1 II. 



Apparently it is the cause of a complete defoliation of the trees in 

 the middle of summer. It was collected in only two localities, but it 

 was observed in several other places. 



Specimens collected : Seguin, 2307 ; Austin, 312S. 



BUMELIA. 



Leaf -spot {Cercospora lanuginosa Heald and "Wolf, 82). — This 

 disease on Bumelia lanuginosa Michx. first appears as indefinite- 

 margined dark-brown spots on the upper surface of the leaf. At 

 length these areas become 1 to 3 mm. in diameter, irregular in out- 

 line, with a definite brown margin and a grayish center. Owing to 

 the woolly coating on the lower leaf surface, the leaf spots show 

 through only faintly as brown spots. Scattered over the upper sur- 

 face of the spot are very dense clusters of conidiophores, 15 fx in 

 length. The spores are cylindrical to slightly clavate, pale smoky, 

 45 to 54 by 5 /x, and three to four septate. (PI. II, fig. 2.) 



Specimens collected: Luling, 2222 (type specimen) ; Flatonia, 2742. 



226 



