Heald-Wolf: New Species of Texas Fungi 19 



sometimes an evident zonation is exhibited due to the concentric 

 arrangement of the dark conidial tufts. This blight causes the 

 death of many leaves and much defoliation. 



Cercospora Malachrae 



Maculis orbicularibus vel suborbicularibus 1-4 mm. diam., 

 centro flavido-griseis, purpureo-marginatis ; conidiophoris caespi- 

 tosis, amphigenis nodulosis, apice pallidioribus, 90-120 X 4~5 ; 

 conidiis clavatis, hyalinis, apice attenuatis, 100-210 X 4-5 

 pluriseptatis. 



On Maiachra capitata L. Victoria, 2347 (type). 



Circular or subcircular spots are produced on the living leaves. 

 They have a yellowish-gray center, on which the conidial tufts are 

 evident, surrounded by a dark-purple border. The spots are 

 slightly less pronounced upon the under surface. 



The conidiophores are amphigenous, in fascicles of a few to 

 a dozen, brown, with slightly paler tips, nodose extremities, and 

 several septa. This species of Cercospora seems to be distinct 

 from the many described for different species of the Mallow 

 family. It agrees most nearly with C. polymorpha Bubank. 



Cercospora obscura 



Maculis rotundatis, griseis, zona dilute brunnea circumdatis. 

 1-2 mm. latis; conidiophoris epiphyllis, fasciculatis 4-7, brunneis, 

 apice hyalinis 50-80 X 4-5 p ', conidiis rectis curvulisve, cylin- 

 draceis, 3-4-septatis, dilute brunneis, 40-74 X 3-4 



On living leaves of Cynara Scolymus L. Beeville, 186 1 (type). 



The presence of this disease is made manifest by circular, gray 

 spots, which appear on the upper surface of the leaf in great 

 numbers. Each spot has a faint brown border with the tufts of 

 conidiophores on the upper surface. Since the lower surface of 

 the leaf is covered by a silvery tomentum, the spots appear as 

 slightly darker areas. 



Cercospora perniciosa 



Maculis rufo-brunneis, atro-marginalis saepe zonatis, inferne 

 pallidioribus, 3 cm. diam., confluentibus, foliis omnibus occupanti- 

 bus ; conidiophoris dense fasciculatis, hyalinis vel dilute brunneis, 

 40-50X3-4/^; conidiis clavatis, guttulatis, obscuro septatis, 

 40-105 X 3-4/*- 



