Heald-Wolf: New Species of Texas Fungi 



13 



The spots have gray centers, with narrow brown borders edged 

 with a tinge of yellow, and show in the center numerous white 

 conidial tufts. 



Cylindrosporium solitarium 



Maculis numerosis, minutis, .5-1 mm. diam., initio atro- 

 brunneis, deinde centro plus minusve pallescentibus vel albescen- 

 tibus ac margine angusto viride cinctis ; acervulis hypophyllis, 

 initio innatis 1-2 in quaque area ; conidiis plerumque leniter 

 curvulis, cylindraceis, hyalinis, 3-6-septatis, 45-60 X 3~4 



On living leaves of Robinia pseudacacia L. Austin, 459, 1909 

 (type) ; Georgetown, 2334. 



This disease is characterized by the presence of minute brown 

 spots upon the leaflets. In the early stages of the disease the 

 leaflets have their normal green color and the spots show as 

 circular areas, which have a pale-brown center and a narrow 

 darker brown border surrounded by a faint zone of chlorotic 

 tissue. As the disease progresses the entire leaflet turns to a 

 bright-yellow color, with the exception of narrow zones of pale- 

 green which persist around the circumference of the brown spots. 

 In this stage the spots show an outer zone of green, a middle 

 zone of dark-brown, and a central area of light-brown or grayish 

 tissue. Affected leaflets may show from one to forty spots and 

 these are generally isolated, although they may be somewhat 

 clustered. The leaflets fall soon after they assume the yellow 

 color, and sometimes even before the complete chlorotic stage has 

 has been reached, and in many cases considerable defoliation 

 results. The disease was observed during the season of 1908 in 

 a much more severe form than during the past season. In all 

 cases it was observed only on nursery trees which were badly 

 crowded. Each spot shows one and occasionally two acervuli, 

 which occupy the middle of the light-brown central area. A 

 straight or curved mass of spores may be seen extruded from the 

 acervulus, which is immersed in the tissue of the under surface. 



Cylindrosporium tenuisporum 



Plerumque hypophyllis, saepe epiphyllis; maculis leniter irre- 

 gularibus, superne brunneis, centro griseolis, margine angusto 

 flavido cinctis, inferne aequaliter brunneis, 2-10 mm. diam. ; 



