302 BULBS AXD TUBEROUS-ROOTED PLANTS. 



Seitg. , closely related to tlie Pythiums, which are among 

 the worst enemies known upon the potting bench or in 

 the greenhouse. Rosellinia Massinkii, Sacc, thrives 

 upon the bulbs, while, perhaps, the worst of all, is Bacil- 

 lus hyacinthi, Wakk., 

 Trev., which is known 

 as the Hyacinth Disease, 

 and will be considered 

 later. 



The Tulips have two 

 species of the rust, name- 

 ly, Puccinia tulip a, 

 Schw., and P. Prostii, 

 Mong., both thriving 

 upon the leaves. There 

 V v * s a smu ^ Ustilago tulipa 



(#.),Wint., of the Tulip, 

 as the specific name indi- 

 cates. Not the least de- 

 structive, particularly to 

 the bulbs, is a gray mold, 

 Botrytis pa rasitica, Cav. , 

 which is closely related 

 to the Botrytis causing 

 the trouble among Lilies, 

 known as the Lily Dis- 

 ease. (See engraving.) 



The Narcissus has a 

 rust preying upon it, 

 namely, Puccinia Schroe- 

 theri, Pass., that some- 

 times is quite destructive 

 to the Narcissus poeticus. 

 A rust upon the Crocus is known to science as Uromyces 

 croci, Pass., affecting the foliage in particular. The 

 Gladiolus has a rust, Urocystis gladioli (E) } Sm., upon 



LILY ATTACKED BY BOTRYTIS 

 FUNGUS. 



