149 
SYNCEPHALIDE. 
Syncephalis, Van Tiegh. 
S. fasciculata, Van Tiegh. 
On wet and decaying vegetable - 
matter. 
PERONOSPORES. 
Cystopus, Lev. 
C. candidus, Lév. 
On Capsella Bursa-pastoris, 
Cheiranthus Cheiri, 
simum perofskianum, and 
Pringlea antiscorbutica. It 
has d sapossible 
to keep the last named plant 
in cultivation, "rt m the 
attacks of this parasi 
C. Tragopogonis, Schröt. 
Parasitic on dnd pra- 
tensis and Ipom 
Phytophthora, De Bary. 
P. infestans, De Bary. 
Parasitic on leaves and tubers 
of the potato (Solanum 
berosum). This fungus is 
the cause of the destructive 
ourge p called 
Plasmopara, Schröt. 
P. pygmaea, Schröt. 
Parasitic on leaves of various 
Ranunculaceous plants Are- 
mone, Aconitum, Isopyrum. 
P. nivea, ScArót. 
Parasitic on leaves of item 
of Aegopodium and Coni 
M on leaves of Centaurea 
an essen This fungus 
is often very destructive to 
Pen bun appearing on 
e leaves as a very delicate 
white film 
| 
Peronospora, Corda. 
P. Myosotidis, De Bary. 
On living leaves of Myosotis 
cette and Symphytum 
tuberc 
P. Viciae, T e 
On living leaves of various Le- 
-guminous plan 
P. Ficariae, Tul, 
On living leaves of Ranunculus 
P. arborescens, De Bary. 
On living leaves of Papaver 
Argemone, P. somniferum, 
also on various garden forms 
of poppy. 
P. Violae, De Bary. 
On living leaves of Viola 
canina and V. sylvestris, | 
P. Trifoliorum, De Bary. 
On living leaves of Trifolium 
minor, T. oil ott and on 
Lotus corniculatus 
P. grisea, De Bary. 
On living leaves of Veronica 
Chamaedrys. 
P. Lamii, De Bary. : 
On Pike leaves of Lamium 
rubrum 
P. effusa, Rabenk. 
On Chenopodium album. 
P. sordida, Berk. 
On living leaves of Verbascum 
Thapsus. 
P. sparsa, Berk. 
Onliving leaves of cultivated 
roses. 
C2 
