184 



H. No. 46. From E. J. Butler, Mar. 10, 1921. Isolated from wheat 

 by R. E. Massey in Khartoum in the Anglo-Egyptian Sudan. The state- 

 ment is made that "the straw was completely rotted through the base, and 

 broke off short when handled. The fungus was present in pure culture 

 on the crown and roots."* 



DISCUSSION OF FOREGOING LlST WITH SEVERAL 

 BRIEF DESCRIPTIONS 



H. Nos. 29-32, though perhaps not quite identical, agreed closely 

 with each other. They were mostly 5-celled, with the central cell in- 

 equilateral and the two end-cells pale. In conidial measurements they 

 approached rather closely to H. inaequalis Shear, H. tritici P. Henn., and 

 H. geniculatum T. & E. 



H. Nos. 13 and 14 were of identical parentage. 



H. Nos. 15 and 16 were from one strain though separated by 

 several transfers. The original strain (15) was sent because the growth 

 (16) did not look characteristic. 



H. No. 11 usually gave no conidia at all and was quite distinct in 

 culture characters and in color and septation of conidia. 



H. Nos. 36, 40, and 41 are closely alike in morphological characters. 

 H. Nos. 40 and 41 differ from H. No. 36 in that they do not possess the 

 abundant aerial mycelium. Nos. 40 and 41 differ in zonation and in 

 amount of aerial mycelium, and all three of these forms differ somewhat 

 in their conidial graphs. They also differ in mycelial characters and 

 in the way in which they penetrate wheat cells, though all three do the 

 latter vigorously, completely occupying the cells and causing rotting. 

 The three had best be regarded as elementary species of the same Linneon. 



Description of H. No. 36. Conidia mostly long and slender (PI. XXI, a) 

 but very variable in length. Stipe short but distinct. Apex pale. No 

 constrictions at the septa. Septa usually thick and obvious. Conidia 

 tapering very slightly from point of maximum thickness toward each end; 

 straight or slightly arched. Episporium brittle; endosporium gelatinous. 

 Conidiophores uniform; sterile portion thin, slender, quite long (350 ju), 

 about 4 n thick, smooth, brown, cells 24-28 ju long, not constricted 

 at the septa; fertile portion slightly thicker and darker, cells short, there- 

 fore geniculations crowded, growth on agar characterized by abundant 

 aerial mycelium (PI. X) more abundant than in any other form studied 

 as was also evident under standard conditions. 



'From letter from E. J. Butler dated Feb. 28, 1921. 



