50 



SEPTORIA ATRIPLICES, (West.) Fuckel. On leaves of goosefoot 

 (Chenopodiuni hybridum and C. albiduni). Very common and 

 destructive. 



SEPTORIA EKIGEKONTIS, B. & C. Leaf spot of horse weed 

 (JSrigeron canadense). Plentiful and destructive. 



SEPTORIA UU-TUCICOLA, E. & M. Leaf spot of lettuce. On leaves 

 of wild lettuce (Lactuca sp . ) Not uncommon and often 

 rather injurious. 



SEPTORIA POLYGONORUAI, Desin. Leaf spot of smart weed. On 

 leaves of lady's thumb (Potygonumpersicaria) and smart weed 

 (P. pennsylvanicd). Forms conspicuous spots on the leaves. 

 Very common and quite destructive. 



SEPTORIA RUDBECKIJE, E. & Halsted. Leaf spot of cone flower. 

 On leaves of tall cone flower [Rudbeckia lacmiata]. Very 

 plentiful and destructive. Forms large irregular purple- brown 

 spots containing one or more whitish ones. The spots often 

 run together and cover the entire surface of the leaf, causing 

 it to wither and die. 



HYPHOMYCETES. 



OVULARLA OBLIQUA, [Cke.] Oud. Leaf spot of dock- On leaves 

 of curled dock (humex crispus), and golden dock (It. 

 maritimus}. Forming brownish spots on the leaves- Com- 

 mon and destructive. 



RAMULARIA ARVENSIS, Sacc. On leaves of five finger or cinque 

 foil (Potentilla norvegica). Very common and one of the most 

 destructive members of the genus- 



CERCOSPOKA AVICULARIS, Wint. Leaf spot of knot weed. Very 

 common on leaves of common knot weed or door yard grass, 

 (Polygonum aviculare & P. erectum). It is very destructive, 

 forming whitish spots on the leaves. Many patches of this 

 weed were almost completely destroyed by the fungus this 

 season. 



CERCOSPORA CLAVATA, (Ger.) Peck. On leaves of swamp milk- 

 weed [ ^sclepias incarnata ) and common milkweed [ A. syriaca~\. 

 Forms brown patches on the under surface of the leaves. 

 Common, sometimes becoming quite injurious. 



CERCASPORA ZIZIAE, E. & E. On leaves of Zizia cordata. Quite 

 common and injurious. Form conspicuous white spots with, 

 purple-brown borders. 



