IOWA ACADEMY OP SCIENCES. 
203 
less frequently during the past season. During the month of 
May some patches here and there were seen, but not so common 
as it was in 1892. That year it took away whole patches of 
this miserable weed. After the fall rains in August the fungus 
slightly increased somewhat. 
Plasmospara lialstedii (Farlow), BerletDeTon. Not observed, 
but a few years ago it was so abundant as to completely cover 
the plants of Helianthus annuus, H. tuber osus and other weeds of 
the Compositce. 
Plasmospara viticola (Berk et Curt.), Berl et DeTon. This 
fungus was so abundant in 1892-93 as to seriously threaten and 
injure cultivated grapes. It did not appear either on the wild 
grapes or cultivated, although a diligent search was made 
for it. 
Bremia lactucce Regel. Although abundant in 1893 on several 
wild species of Lactuca, in 1894 it was not found. 
Albugo Candida (Pers.), Kuntze. On Baphanus sativa was 
abundant, as it was also on Capsella bursa-pastoris, oospores 
abundant in inflorescence of radish. 
A. portulaccB (D. C.) C. Kuntze. Was abundant during the 
entire season on Portulaca oleracea. 
USTILAGINE^. 
Smuts on some cultivated plants have been very abundant 
this year. 
Tilletia striceformis (West), Magnus. Occurred in places on 
Phleum pratense but not so abundantly as a few years ago. 
ruietia foetans (B. & C.), Trelease. On wheat was not 
observed. 
Urocystis agropyri (Preuss), Schroeter. On Elymus canadensis 
was quite abundant in places. 
Ustilago tritici (Pers.), Jensen. Occurred to a considerable 
extent on both winter and spring wheats. 
Ustilago liordei (Pers. ), Kellermann & Swingle. Also occurred 
on barley. 
Ustilago nuda (Jensen), Kellerman & Swingle. More common 
than Ustilago liordei. 
Ustilago segetum (Bull), Dittm. The usual amount occurred 
on Arralientlierum avenceaum. 
Ustilago avence (Pers.), Jensen. Abundant on oats. 
Ustilago liypodytes (SchL), Fr. Found on several occasions 
on Stipa spartea by Mr. Weaver, but not so abundant as reported 
by Mr. Stewart a few years ago. 
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