for} 
NORTH AMERICAN FLORA 
On Dicotyledonous Hosts 
On HeErRBacEOous Hosts 
Spores subglobose and rather large. 
On Fabaceae. 
Spores containing one large oil-drop. 
Spores without conspicuous oil-drop. 
On other hosts. 
Spots terminal, often covering a third of the leaf; on Apocyna- 
ceae. 
Spots not terminal. 
Spots irregular, large, reaching 1 cm.; spores 7 X 9 yw; on 
Podophyllaceae. 
Spots circular or subcircular, rather small; spores 3.5-7 wu long. 
On Saxifragaceae, 
On Pyrolaceae. 
On Primulaceae. 
Spores ellipsoid or nearly globose, 2-5 X 3.5-7 y. 
Spores subglobose, 5-6 uw in diameter. 
On Gentianaceae. 
Spores broadly ellipsoid, not or scarcely more tian twice as long as 
broad, usually less. 
Spores 2-3 XK 4-7 uw 
On Urticaceae. 
On Polygonaceae. 
Spores 3-4 & 5.5~7 pu. 
On Cucurbitaceae. 
On Carduaceae. 
Spores 4-5 X 6-9 pw. 
Spores containing two conspicuous oil-drops; on Onagraceae. 
Spores without conspicuous oil-drops. 
Spots large, reaching a diameter of 1 cm.; on Chenopodia- 
ceae. 
Spots small, not usually exceeding 5 mm., often less. 
On Apocynaceae. 
On Convolvulaceae. 
Spores narrowly ellipsoid, more than twice as long as broad, usually 
three times. 
Spores averaging 3-4 & 6-10 yw. 
Spots subcircular, not exceeding 2-3 mm. in diameter. 
Spots translucent and often deciduous; on Caryophyllaceae. 
Spots not translucent and not deciduous. 
On Verbenaceae. 
On Carduaceae. 
Spots large, often covering a large part of the leaf, usually irregu- 
lar, rarely subcircular. 
Spots definite, subcircular or irregular; on Nymphaeaceae. 
Spots indefinite and irregular. 
Spots occurring on the tips and margins of the leaves; on 
Rutaceae. 
Spots covering most or all of the leaf. 
Spores ellipsoid or almond-shaped; on Tetragoniaceae. 
Spores ellipsoid or short-cylindric; on Oxalidaceae. 
Spores averaging 2-3 X 5-10 nz. 
On Carduaceae. 
Spots large, 5 to 10 mm. in diameter; on Petasites. 
Spots small, 1-5 mm. in diameter. 
Spots indefinite, 4-5 mm.; on Antennaria. 
Spots subcircular, not exceeding 2-3 mm. in diameter. 
Spores 2.5-3 X 4-6 yw; on Verbesina, 
Spores 2-3 X 5-7 yw; on Cirsium. 
On Solanaceae. 
On Lycopersicon, 
On Solanum. 
Infected tissues becoming translucent. 
Infected tissues not translucent. 
On Fabaceae. 
Spots small, circular or subcircular; on Mucuna. 
Spots large, indefinite in form. 
Spots often covering the whole leaf; on Medicago. 
Spots terminal, marginal, or indefinite. 
On Lathyrus. 
On various legumes. 
On Ranunculaceae. 
Spots 3-4 mm. in diameter; on Paeonia. 
Spots 8 mm. in diameter; on Xanthorrhiza. 
On Cucurbitaceae. 
On Cucurbita. 
On Sechium. 
On Cucumis. 
82. 
83. 
[VoLUME 6 
. macroguitata. 
. Meibomiae. 
minor. 
. Podophylii. 
. Mitellae. 
. Pyrolae. 
. Dodecathei. 
Steironematis. 
gentianaecola, 
. boehmeriicola, 
Polygonorum, 
Sicyna. 
. Pitcheriana. 
. Ludwigiae. 
Betae. 
glaucispora. 
Batatas. 
. tenerrima. 
. verbenicola. 
. Lappae. 
. fatiscens. 
. Dictamni. 
. Molluginis. 
. guttulata. 
. Petasitidis. 
. Anlennariae. 
Verbesinae. 
Cirsii. 
Lycopersici. 
Dulcamarae. 
horlorum. 
Mucunae, 
Bonanseana. 
. orobella, 
bhaseolina. 
Commonsii. 
A anthorrhizae. 
orbicularis. 
vechit. 
Cucurbitacearum. 
