248 DISEASES OF CULTIVATED PLANTS 



hispid; asci 8-spored; spores elliptic- oblong, 3-septate, con- 

 stricted at the septa, middle cell often thickened and muri- 

 form, honey-colour, surrounded by a hyaline stratum, 36-48 

 Xi 8-2 1 /A; paraphyses branched. 



Heminthosporium form. Conidiophores solitary or in 

 small clusters, septate, coloured, often angularly bent; conidia 

 subcylindrical, 5-9-septate, brownish, 50-125X14-21 /*. 



As the seedlings are infected by spores adhering to the 

 seed, treating the seed with a solution of formalin, as recom- 

 mended for loose smut of oats, should be of service. As it 

 is proved that the fungus is capable of developing on many 

 of our common grasses, it behoves the farmer to keep 

 headlands, hedges, and ditches free from such grasses. This 

 is, I am quite aware, carried into effect by most good farmers, 

 notwithstanding the dictum of an academic professor that 

 such a method is impracticable, and only a mycological 

 myth. 



Noack, Zeitschr. Pflanzenkr., 15, p. 193 (1905). 

 Potter, Observations on a disease producing the ^ deaf -ear' 

 of the barley. 



Ravn, Zeitschr. Pflanzenkr., u, p. 13 (1901). 



HYSTERIACEAE 



The characteristic feature of the present group is the 

 elongated perithecium, which opens by a long slit through- 

 out its entire length. The perithecium may be linear, 

 stellate, with several radiating arms, or shaped like a mussel 

 shell standing on end. The slit or opening of the peri- 

 thecium is usually bounded by thickened margins. At one 

 time included in the Discomycetes, the coriaceous or carbon- 

 aceous perithecia, and usually coloured, septate spores, 

 indicate closer relationship with the Pyrenomycetes. 



Minute fungi, generally black, and as a rule saprophytic 

 on wood, twigs, leaves, etc. A few are parasitic on leaves 

 and stems. 



Massee, Geo., British Fungus-Flora, 4. 



LOPHODERMIUM (CHEV.) 



Ascophore immersed, elliptical, black, opening by a narrow 

 slit; spores needle-shaped, hyaline, continuous, arranged in 

 a parallel fascicle in the ascus. 



