244 MISSOURI STATE HORTICULTURAL SOCIETY. 



osho, Dracut Amber, Lady, Martha, Telegraph, Mason's Seed- 

 ling, Black Pearl, Blue Dyer (Franklin), Clinton and Goethe. 

 III. Category: suffering seriously in unfavorable seasons, and ?io^ re- 

 coimnendable for localities usually', exposed to mildew. Herbe- 

 mont, Lenoir, Louisiana, Rulander, Alvey, Catawba, Diana and 

 Isabella. 

 Dusting the leaves with sulphur is a good remedy for the second 

 form {Uncinula Spiralis), hut sulphur has very little effect on the 

 Peronospopa^ because the plant body is internal. 



A mixture of coperas and lime (five pounds of coperas to twenty- 

 five pounds of lime) has also been used with success. 



The members of the next group of fungi to which I incite your 

 attention are exceedingly abundant. They are commonly known a& 

 rusts, and UredinecB is the name of the order to which they belong. 

 The plant body, or hypha, lives in the tissues of the host plant. The 

 hypha is composed of long, branching, colorless threads, and there- 

 productive bodies, known as spores, vary in color from orange red to 

 dark brown. The spores are formed beneath the epidermis, and when 

 they have attained the proper size they rupture the epidermis and ap- 

 pear to the naked eye as a rust like powder. 



One of the most remarkable things concerning these plants is their 

 alternation of fruit forms. As an example of this we have occurrin/^ 

 in spring on the young branches of the red cedar {Juniperus- Virgin- 

 iana) a fungus which forms a jelly-like mass. This fungus has re- 

 ceived the name Gytnnosporangium Macropus. It is now believed 

 that this is only one stage of a fungus that occurs on the leaves of the 

 pear, apple and hawthorn, and known under the generic name of Ro- 

 estelia. The full life-history of most of the plants belonging to this 

 order is unknown, but the life-history of those that have been traced 

 is about a3 follows : 



Early in spring the leaves of many plants will be found spotted 

 with a number of wart like protuberances. If we examine these pro- 

 tuberances with a lens we will find that they consist of a number of 

 little cups, and that the cups are filled with an immense number of 

 orange-red, globular bodies. These cluster cups, as they are commonly 

 called, can be found on the leaves of the gooseberry, barberry, man- 

 drake or May apple, and many other plants. The orange-red, globuUr 

 bodies, called spores, are the reproductive bodies, and when they fall 

 upon the proper host plant they germinate and produce in the tissue 

 of the host plant a dense mass of mycelium. In a short time this my 

 celium gives rise to a second form of fruit, which ruptures the epider- 

 mis and forms reddish-brown postules on the leaf. The spores or re- 



