LILY DISEASES. 375 



Finally, if the foregoing precautions have been neglected and the 

 fungus appears on the foliage, spraying should be resorted to, using a 

 solution consisting of two ounces of potassium sulphide dissolved in three 

 gallons of water. The soil should be thoroughly drenched at the same 

 time with a solution double the strength of the one given above. 



Always bear in mind the fact that fungus spores cannot germinate on 

 the dry surface of a leaf or flower ; and, furthermore, spores can only 

 exist when the fungus is fruiting somewhere close by. Therefore decay- 

 ing vegetable matter should not be allowed to lie about, and the more 

 ■frequently the surface of the soil is broken the less opportunity is afforded 

 for the mycelium of the fungus gaining a foothold in the ground. 



Uromyces Erythronii, Passer. 



This fungus is one of the "rusts," and although at present rare in 

 England, there is the possibility, in fact the probability, of its being im- 



FiG. 191. — Uromyces Eeythronii. 1. Portion of a leaf showing clusters of the 

 fungus. Nat. size. 2. A single group of the fungus fruit known popularly as 

 ■'cluster-cups": x 100. 3. Uredo, or summer-spores: x 400. 4. Teleuto, or 

 winter-spore : x 400. 



ported from the Continent, where it is abundant, and at times does a 

 considerable amount of injury, not only to several species of L Hi urn, but 

 also to species of Scilla, Alliiun, Fritillaria, Muscari, and Enjthronium. 

 The fungus also occurs in Asiatic Siberia and in North America. 



The foliage is the part attacked. First appear the spermogonia under 



