Tharp: Texas Parasitic Fungi 



107 



ally faintly uniseptate, 20-55 X 4-5^5 ; hypophyllous conidio- 

 phores differ from epiphyllous in much greater length (averag- 

 ing more than twice as long), in being pluriseptic, and in being 

 fewer fascicled and more spreading; conidia hyaline, 100- 

 235 X 3 upward attenuate, abruptly truncate at base, straight 

 or occasionally slightly curved, faintly multiseptate. 



On leaves of herbarium specimen of Acalypha ostryae folia 

 Ridd., U. of T. herbarium, collected Austin, Texas, A. M. Fergu- 

 son, Oct. 20, 1 901, identified Jan. 8, 1916. 



Cercospora althaeina Sacc. 



Maximum length of conidia in our material 120^, opposed to 

 60 /x in original description; 12-14-septate opposed to 2-5-septate ; 

 conidiophores averaging 50-55 X 5 frequently more than 100 fx 

 long, opposed to 40 X 5 rarely 100/x long; subgeniculate bearing 

 scars of conidia at geniculations (geniculation not mentioned in 

 description). 



On living leaves of Althaea rosea Cav., Houston, Texas, July 

 9, 191 5, B. C. Tharp. 



Cercospora ammanniae sp. nov. 



Spots minute, 1-2 mm. in diameter, circular or subcircular, 

 dirty-grayish-brown with purplish raised margin above, rusty- 

 brown below, sometimes apparently confluent at tips causing 

 death of the whole tip of leaf ; conidiophores amphigenous, densely 

 fasciculate on tuberculate base, light-brown to subhyaline, spread- 

 ing, 1-3-septate, strongly geniculate, rarely branched toward tips, 

 40-60 X 4 n ; conidia hyaline, obclavate to attenuate, septate 

 below, guttulate above, 60-100 X 3-4/*, rarely longer. 



On living leaves of Ammannia coccinea Rottb., Austin, Texas, 

 /. M. Lewis & B. C. Tharp. 



Cercospora apiifoliae sp. nov. 



Spots amphigenous, marginal or central, brown, orbicular to 

 irregular, 1-7 mm. in diameter, surrounded by a more or less 

 yellow border ; conidiophores principally epiphyllous, densely 

 fascicled, surmounting a subtubercular base, olivaceous, continu- 

 ous, tortulose, 20-25 X 3-4 ^ ; conidia light-olivaceous, faintly 

 pluriseptate-guttulate, cylindric to spindleform, 30-50 X 3 



On living leaves of Crataegus apiifolia Michx., Texarkana, 

 Texas, Oct. 16, 191 5, /. M. Lewis & B. C. Tharp. 



