BASIDIOMYCETES. 



Uredine^e. 



UREDO ARACHIDIS, Lagh. 

 (Ground Nut Rust.) 



The leaves of the ground nut, or pea nut, are sometimes 

 affected with this disease. Small, brownish spots appear 

 on the under surface of attacked leaves. 



Destruction of the diseased leaves and spraying with a 

 suitable fungicide are to be recommended. 



Diagnosis : — Sori small, scattered, on the under side, 

 surrounded by the ruptured epidermis, brown ; uredospore 

 ovoid-round, 24-30 microns diamr. ; epispore yellow. 



SACCARDO : Sylloge Fungorum* Vol. XIV, p. 394. 



Uredo Kilhnii, Wakker and Went, is parasitic on sugar 

 cane in Java, causing a rust of the leaves. 



WAKKER AND Went : " De Ziekten van het Suikernet 

 op Java" p. 144. 



UREDO CANNAE, Winter. 

 (Canna Rust.) 



The disease was first described from Brazil ; more 

 recently it has made its appearance in Trinidad, where it 

 has proved to be a destructive pest to cultivated cannas. 

 Small, orange-coloured spots are formed on the leaves, 

 which become discoloured and die. 



The destruction of diseased leaves is to be recom- 

 mended ; spraying with a suitable fungicide should also be 

 effective in checking the spread of the disease. 



Diagnosis. — Sori generally hypophyllous, rarely also 

 epiphyllous, either densely scattered over the entire surface 

 or collected in groups, minute, pale yellow, for a long time 

 covered by the epidermis; spores variable in form, 

 yellowish, echinulate, 25-46 by 16-23 microns. 



MASSEE : Text-Book of Plant Dis., p. 423. Trinidad 

 Bull., Vol. III., p. 86. 



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