HYPODERMIUM 447 



Spray with dilute Bordeaux mixture when the leaves are 

 expanding, and again after an interval of three weeks. 



Fairchild, Journ. Mycol., 7, p. 249 (1893). 

 Pammel, Iowa Agri. Exp. St., Bull. 13 (1891). 



Chrysanthemum leaf blight (Cylindrosporium chrysan- 

 themi, Ellis and Dearness) has proved destructive to culti- 

 vated chrysanthemums in Canada, and has been also observed 

 in this country. Large, brownish blotches appear on the 

 leaves, which soon turn yellow and die. When the foliage is 

 attacked the flower-buds do not expand. The diseased leaves 

 do not fall, but hang down round the stem. 



Spots large, becoming blackish, pustules of conidia appear 

 on both surfaces of the blotches; conidia fusoid, almost 

 straight, 50-100 X 3-4-5 /^. 



Diseased plants were sprayed with various solutions 

 without checking the disease. It is recommended to remove 

 and destroy infected plants. 



OPHIOCLADIUM (CAVARA) 



Forming minute, downy tufts, fertile hyphae fasciculate, 

 much curved ; conidia borne singly at the tips of the conidio- 

 phores, hyaline, continuous. 



Allied to Oospora. 



Barley mildew. Cavara has described a new mould 

 parasitic on barley leaves. It forms very small, grey flecks on 

 which are seated minute, fruiting tufts of the fungus, which 

 come through the stomata from a subepidermal stroma. The 

 parasite, called Ophiocladium hordei (Cavara) is not injurious 

 up to the present. 



Tufts very minute, white, in groups on dead streaks on the 

 leaf. Conidiophores springing from a subepidermal white 

 stroma, hyaline, continuous or i-2-septate, 20-30X3-4 p ; 

 conidia elliptical, hyaline, 6-8 X 4-5 /*. 



Cavara, F., Zeitschr. Pflanzenkr., 3, p. 25 (1893). 



HYPODERMIUM (LINK.) 



Spore-clusters produced under the cuticle and bursting 

 through at maturity, often elongated ; spores produced in 

 chains, elongated, continuous, hyaline. 



