Heald-Wolf : New Species of Texas Fungi 



11 



The acervuli do not occur on the young cankers, but nearly 

 mature or complete cankers show a few which are visible to the 

 naked eye as small black specks, while they become much more 

 abundant on the stems of plants which have been dead for a 

 few days. 



Colletotrichum griseum 



Areis initio indefinite marginatis, flavidis dein definitis, margine 

 brunneo elevato, centro griseis, 8-10 mm. latis ; acervulis zonatis 

 vel sparsis, primo tectis, globulosis vel lenticularibus, 250 ^ diam. ; 

 setis numerosis, brunneis, cylindraceis, saepe superne attenuatis, 

 40-60 X 5 p ; conidiis rectis vel leniter curvulis, granulosis, guttu- 

 latis, hyalinis, raro inaequaliter i-septatis, 14-17X4/^ 



On leaves and branches of Euonymus japonicus Thunb. 

 Austin, 1280 {type) ; San Antonio, 1404; Lockhart, 21 10; 

 Georgetown, 2363, 2375, 2376. 



This is one of the most common diseases of the Chinese box 

 for this region. It forms on the leaves indefinite-margined, 

 yellow blotches 1-4 mm. in diameter. These increase in size 

 until the diseased areas are sometimes 8-10 mm. across, and a 

 definite brown elevated border is formed, when the center of 

 the spot becomes gray. Scattered over this gray area are numer- 

 ous black acervuli either zonate or more or less scattered, usually 

 concentrically arranged. Often the spots are marginal or the 

 disease may even apparently work back from the tip of the leaf. 

 The twigs and larger branches are also affected, resulting in the 

 formation of gray cankers 1-8 mm. in diameter. These gray 

 patches drop away, leaving the brown cankered area exposed. 



Cylindrosporium defoliatum 



Areis irregularibus, griseolis, initio 1-2 cm. diam., confluenti- 

 bus, saepe partem majorem foliorum occupantibus ; acervulis 

 amphigenis, plerumque epiphyllis ; conidiis cylindraceis, hyalinis, 

 30-42 X 3-3-5 3-5-septatis. 



On Celtis missis sip piemis Bosc. New Braunfels, 1673; 

 Austin, if 28, 1905 (type) ; Beeville, 1^55; Elgin, 1890; Bastrop, 

 2049; Lockhart, 20/3; San Marcos, 2099; Cotulla, 2180; Luling, 

 2256; Seguin, 2317 ; Georgetown, 2377; Victoria, 2509; Cuero, 

 2578; Stockdale, 2615; Gonzales, 2689; Flatonia, 2709; Yoakum, 

 2771. On Celtis reticulata Sarg. Sabinal, 1975. 



