Heald-Wolf: New Species of Texas Fungi 



21 



On Xanthium sp. Luling, 2236; Georgetown, 2383 (type) ; 

 Nursery, 2567; Cuero, 2588; Gonzales, 2705; Yoakum, 2755; 

 Hallettsville, 2790; Kennedy, 2836; Austin, 2871. 



This fungus produces upon the leaves numerous circular or 

 subcircular spots with dirty-gray or brownish centers surrounded 

 by a narrow darker border. The number* of infections on a 

 single leaf may reach as high as 400 to 600, in which case the leaf 

 shows more or less chlorosis, but frequently the spots are less 

 numerous and the leaf shows little or no deviation from the 

 normal color. 



Clasterosporium diffusum 



Maculis indefinite marginatis, amphigenis ; irregularibus, 

 aequaliter brunneis, 5-10 mm. diam. ; hyphis eflusis, prostratis, 

 saepe laxe gregariis atque erectis ; conidiis curvulis, clavatis, pluri- 

 septatis, brunneis, 45-135 X 4-5 f 4 - 



On Hie oria pecan (Marsh) Britton. Victoria, 2536; Gonzales, 

 2695 (type) ; Yoakum, 2770; Hallettsville, 2783. 



This fungus produces circular or irregular, indefinite margined, 

 brown spots, which are uniformly brown on both surfaces of the 

 leaflets. Dark-brown hyphae run throughout the dead tissue or 

 creep over either surface of the affected area, or are sometimes 

 aggregated to produce clusters of erect conidiophores. 



Helminthosporium giganteum 



Caespitulis sparsis, epiphyllis, maculis stramineis, .5-1 X 1-4 

 mm., confluentibus ; hyphis f ertilibus atro-brunneis, plurispetatis, 

 base leniter inflatis, 200-400 X 9-12 /x ; conidiis cylindraceis 5- 

 septatis, pallide brunneis, granuloso farctis, 300-315 X 15-21 fi. 



On Capriola Dactylon (L.) Kuntze. Falfurrias, 2440 (type). 



This disease is charactertized by the presence of numerous 

 yellowish or pale straw-colored spots, longitudinally elongated 

 and with a narrow brown border. The spots are generally absent 

 from the leaf sheath, and when numerous they may become con- 

 fluent on the lamina and thus cause somewhat extended dead 

 areas. 



Ramularia hedericola 



Maculis magnis, irregularibus, superne griseolo-brunneis, in- 

 ferne aequaliter brunneolis, margine elevato ; hyphis epiphyllis, 

 septatis, 60-120X4/^; conidiis hyalinis, 9-15 X 2.5 fx. 



