406 Transactions. 
us the fungus is transmitted by spores lodged on the seed, between 
the glume and the pale. When the seed is sown the spores germinate 
and infect the emerging cotyledon, as described above. 
Von Liebenberg (1879) has shown that the spores, if kept under dry 
conditions, may remain viable for seven years ; so that seed stored for 
several] years, if sown without preventive treatment, may bear spores 
capable of infecting the young plants as they emerge. A second method 
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glumes to destroy the perennating mycelium therein. In such a case the 
modified hot-water treatment alone would be of use (see p. 400 
2. Ustilago levis Magnus. (Text-fig. 1, and Plate 41, fig. 1.) 
Magn. Abh. Bot. Ver. Prov. Brand., vol. 37, p. 69, 1896. 
U. cg var. levis Kell. et Sw., Ann. Rep. Kansas Exp. Stn., 2nd Rep., p. 259, 
Sori in spikelets, destroying the inner parts, partially concealed within 
„the glumes, forming a semi-compact, dark-brown, almost black spore-mass. 
Spores subglobose, 5-9 mmm. ; epispore smooth, dark chestnut-brown, 
more lightly coloured on one side, 0-75 mmm. thick. 
iost: Avena sativa L. In inflorescences. Herb, Nos. 195, 304. 
Weraroa (Wellington), 80 m., E. Bruce Levy! 12 Jan., 1920. Ruakura 
(Auckland), 120 m., А. Н. Cockayne! 27 Jan., 1921. Lincoln (Canter- 
bury), 30 m., F. E. Ward! 18 Feb., 192]. 
еза Probably world-wide, but recorded only from North 
pe. 
America and 
