REPORT OF THE BOTANIST. 79 
Cercospora Calle P.@C.. ....... Calla palustris. 
Peronospora pygmea Ung ......... Anemone Pennsylvanica. 
lay parasities Pere 2. ait). e.%, Cardamine rhomboidea. 
rE. Greranti Feet ta ctahers aise eels Geranium maculatum. 
Pr. ObLigna AE Tare e's o's sie aie ons Rumex crispus. 
Ps eilisa Gael be kan. Chenopodium album. 
Ramularia Nemopanthis C. d@ P.... Nemopanthes Canadensis. 
In the last family, the Ascomycerss, we find a few groups, such as 
the Perisporiacei or mildews and the species of Rhytisma, inhabiting, 
for the most part, living leaves. But by far the greater part of this 
vast family find their dwelling-place on decaying substances. 
In the Perisporiacet a white webby film usually appears on the 
leaf, and sometimes, as in the pea mildew, this involves the whole 
plant. 
( Spireea opulifolia. 
Poterium Canadense. 
Ayrimonia Eupatoria. 
| 
Spherotheca Castagnei Zev........ : kateb a 
Erechtithes hieracifolia. 
| Taraxacum Dens-leonis. 
. | Brunella vulgaris. 
s. pommnoss CoP os ts ene Rhus glabra. 
( Magnolia acuminata. 
Liriodendron Tulipitera. 
Ribes Cynosbati. 
Celastrus scandens. 
| Cornus florida. 
C. paniculata. 
C. stolonifera. 
| C. circinata. 
Phyllactinia guttata Zev .......... 4 Cratzegus coccinea. 
C. Crus-galli. 
| Corylus Americana. 
| Castanea vesca. 
| Fagus ferruginea. 
Carpinus iNmericand. 
Fraxinus Americana. 
Alnus serrulata. 
| Asclepias Cornuti. 
Salix cordata. 
iimemnla adunea Lev. .....<..5+.5 S. discolor. 
Populus balsamifera. 
Acer spicatum. 
U. ciremata C.d@ Po... ae A. rubrum. 
i Pennsylvanicum. 
Uw. lueulenta louie: ov. csius oo Populus heterophylla. 
