244 DISEASES OF FIELD & GARDEN CROPS. [CH. xxix. 



where other umbelliferous plants have been invaded by 

 mildew, as the resting-spores will be on and in the ground 

 ready for attacking other umbelliferous plants on their 

 germination in spring. 



The mildew of parsnips has been seen on baldmoney, 

 Meum Atkamanticum, Jacq. ; on burnet saxifrage, Pimpi- 

 nella Saxifraga, L. ; P. Anisum ; parsley, Petroselinum 

 sativum, HofFm. ; the garden and wild chervil, Antbriscus 

 Oerefolium, Hoffm. ; and Chcerophyllum sylvestre, Linn. ; 

 and hemlock, Conium maculatum, Linn. 



The common red -rust and black mildew of celery, 

 another umbelliferous plant, is caused by Puccinia apii, 

 Corda, and its Uredo, U. apii, Wall., a fungus closely allied 

 to the rusts and black mildew of corn. This fungus has 

 been proved to be hereditary, and its plasma capable of 

 being transmitted in celery seeds. Celery is sometimes 

 infested with Puccinia heraclei, Grev., a parasite frequent 

 on cow-parsnip or hogvveed. The Umbelliferee are unusu- 

 ally subject to attacks from fungi. 



