Tharp: Texas Parasitic Fungi 



117 



Exosporium liquidambaris sp. nov. 



Spots orbicular, 4-5 mm. in diameter, brown with more or less 

 ashen centers and raised margins, contiguous tissue more or less 

 chlorotic, often occurring at leaf edges where they are half orbi- 

 cular in outline ; sporodochia amphigenous, dark-brown, 20-35 f JL 

 in diameter; conidiophores very short (6-10 X 3-5 fO, continuous, 

 compact in sporodochium ; conidia pale-yellow, septate, curved, 

 cylindric, rounded at ends, faintly pluriseptate, 30-90 X 3 



On living leaves of Liquidambar styraciflua L., Houston, 

 Texas, June 28, 191 5, B. C. Tharp. 



Exosporium platanorum sp. nov. 



Spots few and fairly large (3-4 mm. in diameter), or many 

 and very small (1 mm. or less), brown above, entirely covered 

 with a black apparently waxy substance composed of sporodochia 

 and conidia below ; sporodochia dark brown at base with lighter 

 upper portion, hypophyllous (rarely epiphyllous) , 25-60 fx in 

 diameter; conidiophores light brown, occasionally obscurely 

 septate, subtortulose, very short (10 X 4~5 fO ; conidia brown to 

 olivaceous, curved, slightly attenuate at both ends, 3-5-septate, 

 34-70 X 4-5 



On living leaves of Platanus occidentals L., Austin, Texas, 

 Oct. 23, 191 5, /. M. Lewis & B. C. Tharp. 



Exosporium phoradendri sp. nov. 



Spots circular, 6-8 mm., showing two (usually) concentric 

 shades of brown, margins slightly raised and yellow, alike on 

 both leaf surfaces; acervuli amphigenous, dark-brown, 80-140 fx 

 in diameter, formed below epidermis and rupturing it ; spores 

 yellowish, multiseptate-guttulate, 45-65 X 2 /x. 



On living leaves of Phoradendron flavescens (Pursh) Nutt., 

 Austin, Texas, Feb. 17, 191 5, L M. Lewis. 



Isariopsis clavispora (B. & C.) Sacc. 



Our material showed conidia 30-56 X 6-8 fi, 7-8 septate, non- 

 guttulate ; opposed to 44 X 4~5 3-4-septate, guttulate, in de- 

 scription : Sylloge 4: 631. 



On living leaves of Vitis sp., Jacksonville, Texas, Oct. 15, 191 5, 

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



