IOWA ACADEMY OP SCIENCES. 
147 
DEMATIACE^. 
CladosjKtrium carpox)liilum Thum. 
Rare on Prunus Americana, but abundant on Crataegus 
mollis late in August and September. 
Helmintliosjdorium Graminuin Rabh. 
Nut common on Hordeum vulgare in July. 
Cercosjwra Besedce Puck. 
Abundant on Reseda odorata in August and September. 
C. Beticola Sacc. 
Abundant on Beta vulgaris. (Sugar and mangel beets). 
September. In some cases leaves completely covered 
with cinereous spots. 
C. angulata Winter. 
Abundant on Ribes rubrum, shrubs nearly defoliated lat- 
ter part of July and early August. Fungus appeared 
early in May. 
SPHyEROPSIDE^ SPH^ROIDACE^. 
Septoria Rubi West. 
Abundant on Rubus odoratus, R. canadensis August and 
September. 
Septoria Ribis Desm. 
Abundant on Ribes nigrum, June and September. 
Melanconiaceae. 
Cijlindrosporium Radi Karst. 
Abundant on Cherry. 
Marsonia Juglandis Sacc. 
Trees of Juglans cinerea nearly defoliated by middle of 
August. Not so severe on Juglans nigra. 
M. Martini Sacc. 
Abundant on Quercus robur; majority of leaves affected; 
also occurred on Q. macrocarpa. 
BACTERIAC^. 
Bacillus amylovorus (Burrill) Trev. 
Blight more severe than in 1894. Pyrus Malus, P. pruni- 
folia, P. Sinensis, P. communis and P. lowensis espe- 
cially severe on the following varieties of P. Malus: 
Yellow Transparent apple, Red Queen-Lead, Arabskoe 
Antonovka, Thaler, Oldenburg. It seems, also, to have 
been severe in other parts of the state. Fruiting 
orchards less affected than nursery stock. It would 
seem that the condition of the soil may influence the 
