4 NORTH AMERICAN FLORA 
Spores 14-20 u long. : : 
Spots 5-10 mm. in diameter; on Convallariaceae. 
Spots indefinite; qn Iridaceae, 
Spores three or more times as long as broad. 
Spots blood-red when young; on Amaryllidaceae. 
Spots whitish or brown, never blood-red. 
Spots circular or subcircular. 
On Arecaceae, 
On Trilliaceae. 
Spots irregular or indefinite. 
On Trilliaceae. 
On Tridaceae. 
On Dicotyledonous Hosts 
On CaAcCTACEAE 
On Opuntia. 
On HERBACEOUS Hosts 
Occurring on Carduaceae. 
Spores 16-20 y long; on Artemisia. 
Spores not exceeding 16 uw long and usually less. 
Spores three times as long as broad; on Rudbeckia. 
Spores about twice as long as broad. 
On Solidago. 
Growing on insect galls. 
Not on insect galls. 
Spores on long pedicels. 
Spores not on long pedicels. 
On other hosts. 
Spores 4 X 10 uw; on Lacinaria. 
Spores 4-5 X 8-12 uw; on Doellingeria. 
Occurring on hosts other than Carduaceae. 
Spores less than twice as long as broad; on Apocynaceae. 
Spores about three times as long as broad. 
Spores less than 2 » broad; on Rosaceae. 
Spores more than 2 y» broad. 
Spores less than 3 uw broad; on Solanaceae. 
Spores 3 » or more broad. 
Spores 3-5 & 10-12 yu. 
On Amaranthaceae. 
On Caryophyllaceae. 
On Cucurbitaceae. 
Spores 3-5 X 12-16 yu. 
Spots irregular; on Diapensiaceae. 
Spots circular or subcireular. 
Spots with tufts of mycelial hairs; on Malvaceae. 
Spots without mycelial hairs. 
On Cannabinaceae. 
On Asclepiadaceae. 
On Woopy Hosts; TREES, SHRUBS, OR VINES 
Spores very large, averaging 15-22 » long. 
Spores broadly ellipsoid, 4-8 «4 broad. 
Spots not usually exceeding 3-4 mm. in diameter; on Fagaceae. 
Spots reaching a diameter of 1 em. or more. 
Usually termjnal or marginal, rarely internal. 
On Ericaceae. 
On Apocynaceae. 
On various hosts. 
Usually internal, rarely terminal or marginal. 
Spots surrounded by concentric rings or bands. 
On Artocarpaceae; spores 4-5 X 12-20 yu. 
On Oleaceae; spores 5-7 X 15-20 pu. 
Spots not surrounded by concentric rings. 
On Grossulariaceae; spores 6-9 X 15-22 pu. 
On Caesalpiniaceae; spores 6-7 X 15-20 np. 
Spores narrowly ellipsoid, less than 4 » broad. 
Spots very small, scarcely exceeding 1 mm. in diameter, often 
deciduous; on Aceraceae. 
Spots large and often indefinite. 
Usually terminal or marginal. 
On Oleaceae. 
On Loganiaceae. 
Usually indefinite. 
On Fagaceae. 
On Caprifoliaceae. 
Spores moderately large, averaging 10-15 yu long. 
Spores globose or subglobose, less than twice as long as broad. 
[VOLUME 6 
5. P. Oakesiae, 
6. P. Gladioli. 
7. 
P. Hymenocallidis. 
8. P. Palmetto. 
9. P. Trillii. 
10. P. Medeolae. 
ll. P. Iridis. 
12. P. concava. 
13. P. Raui. 
14. P. Rudbeckiae. 
15. P. gallicola. 
16. P. sphaeropsispora. 
17. P. similispora, 
18. P. Liatridis. 
19. P. astericola. 
20, P. A pocyni, 
21. P. obscurans, 
22. P. Solani. 
23. P. Amaranthi. 
24. P. Silenes. 
25. P. citrullina. 
26. P. Galactis. 
27. P. spinosa. 
28. P. Humuli. 
29. P. tuberosa. 
30. P. phomiformis. 
31. P. maxima. 
32. P. Nerii. 
33, P. terminalis. 
34, P. Roberti. 
35. P. Halstedii. 
36. P. Ellisii. 
37. P. cercidicola. 
38. P. saccharina. 
39. P. Oleae. 
40. P. Gelsemii. 
41. P. fusispora. 
42, P. tineola, 
