Tharp: Texas Parasitic Fungi 



121 



Septoria ambrosiaecola Speg. 



Spots white above, light-tan below, bordered by a narrow 

 margin of tan-brown, 0.5-2 mm. in diameter, angular to subor- 

 bicular; pycnidia epiphyllous, immersed, i-few on each spot, 

 spherical to depressed globose, or occasionally pseudo-confluent 

 and lobed, 95-180 /* in diameter, opening by an irregular cleft; 

 conidia hyaline, undulate, 40-60 X 1.5-2/*. 



On living leaves of Ambrosia aptera DC, Austin, Texas, June 

 17, 1 91 6, McAllister & B. C. Tharp. Differs from description 

 (Sylloge 22: 1 108) principally in the following points as there 

 stated: pycnidia 90-100 /* in diameter, sub-lenticular; conidia 50- 



100 Xi. 5- 2 /*- 



Septoria anemones Desm. 



Spots usually marginal, suborbicular, 3-6 mm. or more in 

 diameter, almost uniformly tan above except where pycnidia give 

 centers a mottled black and tan appearance, sometimes surrounded 

 by reddish-purple borders ; tan below with dirty-blackish centers ; 

 pycnidia amphigenous but more plentiful above, where they are 

 densely gregarious, immersed in host tissue, spherical, black, 

 membranous, 55-100 /x in diameter, ostiole rarely forming a pro- 

 trusion; conidia straight or slightly curved, guttulate, 15-40X 

 1.5/*. 



On living leaves of Anemone caroliniana Walt., Austin, Texas, 

 March 5, 1916, B. C. Tharp. Differs from S. anemones Desm. — 

 so far as his description goes — in pycnidia of our material being 

 amphigenous, and in size of sporulae in his description being only 

 20-22 X I-1.5 fi. 



Septoria angularis sp. no v. 



Spots angular, bounded by veinlets in early stages, but later 

 by confluence covering large areas, brown, changing abruptly into 

 normal green at margins ; pycnidia epiphyllous, light-brown, scat- 

 tered, pyriform, 75-80X100-120/*; immersed in tissues but 

 erumpent through a black-necked ostiole ; conidia usually curved, 

 hyaline-yellow, guttulate, 35-50 X 3 



On living leaves of Aster drummondii Lindl., Austin, Texas, 

 Jan. 15, 1916, B. C. Tharp. Differs from S. astericola E. & E., 



atropurpurea Pk., and vS\ punicei Pk. in both gross and micro- 

 scopic characters. 



