1907. 
1916] 
DUGGAR—THE TEXAS ROOT ROT FUNGUS 23 
ular branches, these last often arising at right angles and op- 
posite, and (2) plectenchymatic strands; almost hyaline when 
young to cinnamon-brown in mature strands. Fertile hyphae 
arising irregularly from the large-celled mycelium or direct 
from cells of the strands, assurgent, simple or forked, with 
spore-bearing portion vesicular (spheroidal to ellipsoidal), 
often 20-28» in length and 15-20, in diameter. Spores finally 
arising also from undifferentiated hyphal and strand cells, 
hyaline, spheroidal to ovoidal, the spheroidal averaging 
4.85.5 in diameter, the ovoidal measuring 5-6x(6-84; ex- 
treme diameters, 3.2 and 9.8 и. The conidial stage forms a con- 
tinuous pulverulent, sometimes crust-like, area on the soil. 
Hab. Hyphae on living roots of many plants and in soil, 
conidial stage on soil in the vicinity of diseased plants. 
Specimens have been deposited in the herbaria of the Mis- 
souri Botanical Garden and the Bureau of Plant Industry, 
Washington, and in the collection of Professor W. G. Farlow, 
Cambridge. 
BIBLIOGRAPHY 
Atkinson, G. F. (’93). Method for ке pure cultures of Pammel’s fungus 
of Texas root rot of cotton. Bot. Gaz. 18:16-19. 1893. 
Curtis, б. W. (92). Alfalfa root rot. Тех. Agr. Exp. Sta., Bul. 22:209-215. 
1892. 
Duggar, B. M. (709). Fungous diseases of plants. pp. 479-481. f. 240. 1909. 
Heald, F. D. (709). Symptoms of disease in plants. Univ. Tex. Bul. 135:pp. 
57-58. f. 56. 1909. 
, (11). Texas root rot of cotton. Tex. Dept. Agr., Bul. 22:303-308. 
1911. 
, and ЗАН; Е. А. (711). List of hae” bgp and fungi occurring 
in Texas. x. Acad. Sei. s Trans, 11:1 
,—— s (12). A plant disease survey in the vieinity of San Antonio, 
exas. U.S. Dept. Agr., Bur. Pl. Ind., Bul. 226:pp. 26, 38, 41, 48, 49, 55, 57, 
„р 1912 
Orton, W. A. (’02-’07). Plant diseases in the United States. U.S. t. Agr., 
Yearbook 1902:718; 1903:555; 1905:603, 604, 610; 1906: 506; 1007: 586. 
agre 02-185 D 8). Root rot of po or ''eotton blight ? Tex. Agr. Exp. 
„ Rept. 1:50-65. 1888; Ibid., Bul 4:18-33. 1888. 
-------, (789). Cottonroot-rot. Ibid., Rept. 2:61-86. pl. 1-5. 1889; Ibid., 
Bul. 7:1-30. pl. 1-5. 1889. 
Shear, C. L. (707). New species of fungi. Bul. Torr. Bot. Club 34:pp. 305-306. 
1907. 
—__——., and Miles, С. Е. ('07). The control of pu root-rot of cotton. 
U: 8. Dept. Agr., Bur. РІ. Ind, Bul, 102:39-42. f. 3. 1907. 
-------, (7073). Texas root-rot of cotton. Ibid, Cire. 9:1-7. f. 1 
