56 
IOWA ACADEMY OP SCIENCE 
Jersey, New York, North Dakota, and some Canadian station. Probably of wide 
distribution. 
55. Claviceps puepukea (Pries) Tul. 
On Agropyron repens (L.) Beauv. V. 
Sclerotia were found rather abundantly, but were not germinated so the 
reference is only provisional. 
OEDER DOTHIDIALES. 
Family Dothideaceae. 
56. Phyllachora graminis (Pers.) Puckel. 
On Hystrix patula Moench (H. Hystrix Millsp.) Bouteloua curtipendula 
(Miehx.) Torr., (Atheropogon curtipendulus Pourn), and Sorghastrum nutans- 
(L.) Nash {8. avenaceum Nash). 
Very common. 
57. Pyllachora Junci Puckel. 
On Juncus interior Wiegand. 
Rather abundant in late summer. 
58. Phyllachora Lespedizae (Schw.) Sacc. 
On Lespediza capitata Miehx. 
Not uncommon. 
59. Ploweightia moebosa (Schwein.) Sacc. 
On Primus americana Marsh, and P. virginiana L. 
. So far as personal observation goes this species which causes the “Black 
knot” of drupaceous fruits is confined to the wild members of the genus 
Prunus. Upon the choke cherry this disease is very abundant and if infec- 
tion is possible from this host then the abundance of choke cherries in this 
region is a serious menace to our orchards. 
ORDER SPHAERIALES. 
Family Sphaeriaceae. 
60. Ventueia pomi (Pries) Winter. IFusicladium dendriticum (Wallr.) 
Puckel.] 
On Pyrus iomensis (Wood) Bailey (Malus Britton.) 
The common apple scab is the conidial stage of this species. Not seen on 
the cultuivated apple, but abundant on the wild crab. 
Family Mycosphaerellaceae. 
61. Guignaedia Bidwellii (Ellis) Vala & Ravaz. [Laestadia Bidwellii 
(Ellis) Sacc., PJiyllosticta viticola Thum., P. ampelopsidis Ellis & Martin]. 
On Psedera quinquefolia (L.) Greene (Parthenocissus Planch.), P. quinque- 
folia Mrsuta (Donn) Rehder, and vitis vulpina L. 
