16 



Mycologia 



Cercospora Crataegi 



Maculis magnis, atro-brunneis irregularibus, inferne pallidiori- 

 bus, 5-10 mm. latis; confluentibus quandoque numerosis; con- 

 idiophoris dense fasciculatis, continuis, brunneis, 24-30 X 5-6 fi ; 

 conidiis clavatis, rectis curvulisve, pluriseptatis, guttulatis, 120- 

 180 X 5-7 A*- 



On leaves of Crataegus sp. Gonzales, 2697 (tyP e )- 

 This fungus causes the formation of large dark-brown, 

 irregular areas from 5-10 mm. or more in diameter. The spots 

 are darker above than below and when as many as 20-25 in 

 number are confluent, involving large areas with chlorotic tissue 

 surrounding them. The upper surface is broken by the numerous 

 brown tufts of conidiophores and conidia. 



Cercospora Elaeagni 



Amphigenis ; maculis orbicularibus v. suborbicularibus, 1-2 mm. 

 latis, centro griseolis vel brunneolis, margine brunneo definite 

 cinctis, saepe totum folium flavidis : conidiophoris fasciculatis, 

 plerumque epiphyllis, atro-brunneis, 40X3.5-41".; conidiis 

 septatis, subhyalinis, clavatis, rectis curvulisve, 28-150X2.5-4^. 



On living leaves of Elaeagnus sp. Floresville, 2861 {type). 



When this disease is present the leaves show on the upper sur- 

 face an abundance of circular or subcircular spots 1-2 mm. in 

 diameter, with a definite brown border and a whitish or brown 

 center. The spots are inconspicuous on the under surface on ac- 

 count of the dense silvery tomentum. There is generally some 

 yellowing beyond the spots and in many cases a pronounced yel- 

 lowing of the whole leaf. 



Cercospora Fici 



Maculis magnis, angulatis, superne brunneis, atro-marginalis, 

 inferne aequaliter flavido-brunneis, 1.5-10 mm. diam. saepe con- 

 fluentibus ; conidiophoris dense fasciculatis, epiphyllis, dilute 

 brunneis, 24 X 4 p ', conidiis clavatis, brunneis, pluriseptatis, 

 60-180 X 3-4-5 A*- 



On a variety of Ficus Carica. Victoria, 2501; Cuero, <?59J 

 (type) ; Gonzales, 26/4; Flatonia, 2711; Hallettsville, 2784. 



This disease appears late in the summer, forming on the leaves 

 large angular or irregular spots, which are dirty-brown above 



