DISEASES OP FIBER PLANTS. 55 



the bolls in several cases either in connection with anthracnose or 

 distinct from it, which are probably due to the same bacterium. 



Specimens collected : San Antonio, 1410 ; Boerne, 1637 ; Beeville, 1822 ; Elgin, 

 1883; Bastrop, 2045; Lockhart, 2066; San Marcos, 2094; Sabinal, 1974; Hondo, 

 1994; Luling, 2240; Seguin, 2301; Georgetown, 2386, 2387; Round Rock, 2414; 

 Victoria, 2348; Nursery, 2543; Cuero, 2584; Stockdale, 2613; Gonzales, 2680; 

 Flatonia, 2726; Yoakum, 2759; Hallettsville, 2797; Falfurrias, 2436, 2438. 



Anthracnose {Glomerella gossypii (South.) Edgerton, 12). — The 

 anthracnose of the cotton bolls is not very abundant in this territory. 

 Bolls were collected which showed only one or two small sunken 

 anthracnose spots, while others were nearly completely covered. No 

 fields were observed where the disease was sufficiently abundant to 

 cause any material injury. 



Specimens collected: Bastrop, 2050; Lockhart, 2079; Luling, 2280; Seguin, 

 2331 ; Victoria, 2517 ; Stockdale, 2639 ; Gonzales, 2708 ; Yoakum, 2772. 



Leaf -spot (Oercospora gossypina Cke. ; Sphaerella gossypina 

 Atk. ) . — Only the Cercospora stage of this fungus was observed. The 

 spore size ranges from 70 to 150 by 3 to 4 /x, which is in excess of the 

 measurements recorded by Saccardo (45). This disease is not as 

 abundant in this territory as the angular leaf-spot and affected leaves 

 are not as seriously injured. 



Specimens collected : Sabinal, 1973; Luling, 2261; Victoria, 2344; Alice, 2495; 

 Nursery, 2573 ; Gonzales, 2661 ; Flatonia, 2715 ; Skidmore, 2801 ; Kennedy, 2840. 



Leaf -spot (Macrosporium sp.?). — A leaf-spot of cotton was ob- 

 tained in a single locality which differed from the angular leaf-spot 

 or the Cercospora spot. It is characterized by the presence of numer- 

 ous brown spots, 3 to 5 mm. in diameter, which show more or less 

 concentric zonation. The tissue adjacent to the spots is frequently 

 colored a pronounced purple. The fungus present is apparently a 

 Macrosporium, but the spores are much larger than those of Macro- 

 sporium nigricantium described by Atkinson (1). 



The spores of our species are 90 to 150 by 12 to 16 /*, long-stipitate, 

 the stipe equaling the body of the spore in length; spore cells 

 uniseriate or muriform, constricted at cross partitions, body cells 4 to 

 7, pale brown. 



Specimen collected: Nursery, 2542. 



Texas root-rot (Ozonium omnivorum Shear). — The common root- 

 rot of cotton is prevalent throughout the entire extent of this terri- 

 tory. In some fields 25 to 75 per cent of the plants were filled. In 

 this connection it may be noted that the same fungus has been col- 

 lected on the following hosts in addition to cotton : Alfalfa, althaea, 

 bean, black locust, cowpea, fig, okra, parsley, and umbrella China tree. 



Specimens collected : Boerne, 1633 ; Beeville, 1823 ; Elgin, 1884 ; Bastrop, 2035 ; 

 Lockhart, 2068; San Marcos, 2095; Sabinal, 1966; Hondo, 1992; Luling, 2238; 



