Abronia, 50. 
Acerates, 41, 
Acolium, 12. 
Actinella, 53. 
/Ecidium, 14. 
ZEsculus, 32. 
Agropyrum, 24, 49. 
Allocarya, 52. 
Amarantus, 4. 
Ambrosia, 42. 
Amorpha, 51. 
Amphicarpea, 34. 
Antennaria, 42. 
Anychia, 30. 
Aphanochete, 9. 
Aphyllon, 39, 
Arabis, 31. 
Arachnion, 18. 
Aralia, 33. 
Arctostaphylos, 36. 
Arcyria, 45. 
Arenaria, 5, 29, 50. 
Aristida, 25, 49. 
Armillaria, 18. 
Arnica, 41. 
Arrhenatherum, 49. 
Arthonia, 12. 
Arthrodesmns, 10. 
Asclepias, 53. 
Ascochyta, 4. 
Asprella, 24. 
Aster, 6, 43, 53. 
Astragalus, 5, 34, 51. 
Atrichum, 21. 
Atriplex, 4, 28. 
Avena, 25. 
Bacillus, 8. 
. Bacterium, 45. 
Barbula, 20. 
Belonidium, 48. 
Beggiatoa, 45. 
Berula, 33. 
Betula, 26. 
Biatora, 12.. 
Bigelovia, 53. 
Botrytis 17. 
Bovista, 18, 
Brickellia, 44. 
Bromus, 20. 
Bryum, 21. 
Buellia, 12. 
Bulbochete, 10. 
Calamagrostis, 49. 
Callitriche, 51. 
Calochortus, 26. 
Cardamine, 31. 
Carex, 4, 28, 49. 
Caulophyllum, 30. 
Centunculus, 36. 
Cerastium, 29. 
Cergtophorum, 17. 
Ceratophyllum, 17, 27. 
Cercocarpus, 384. 
Cercospora, 17. 
Cheenactis, 53. 
Cheetomium, 11. 
Cheetophora, 46. 
Chara, 20, 49. 
Cheilanthes, 21> 
Chenopodium, 2, 
Chondrioderma, 45. 
Chrysopsis, 44. 
Cichorium, 41. 
GENERIC INDEX. 
Cicuta, 51. 
Cladonia, 13. 
Clematis, 50. 
Cladophora, 46. 
Clitocvbe, 19. 
Closterium, 46. 
Cnicus, 6, 41. 53. 
Cocconeis, 47. 
Coleochete, 11, 47. 
Collema, 13. 
Colletotrichum. 16. 
Collybia, 19. 
Comatriche, 45. 
Convolvulus, 36, 
Coprinus, 49. 
Corallorhiza, 26. 
Coreopsis, 42. 
Cosmarium, 10, 46. 
Crategus, 51. 
Crepis, 41, 53. 
Cristatella, 31. 
Cryptanthe, 37, 51. 
Cuscuta, 36. 
Cyathus, 18. 
Cylindrospermum, 8. 
Cymopterus, 33. 
Cyperus, 24. 
Cystopus, 4, 11. 
Delphinium, 30. 
Desmatodon, 20. 
Desmidium, 9 ,46. 
Desmodium, Al. 
Dicranella, 20. 
Diplachne. 25. 
Dodecatheon, 36. 
Dothidia, 47. 
Draba, 50. 
Draparnaldia, 46. 
Dulichium, 24, 
Echinospermum, 5, 38. 
Eclipta, 42. 
Elatine, 5. 
Elodea, 22. 
Elymus, 24, 49. 
Empusa, 10. 
Enteridium., 8. 
Entoloma, 19. 
Epilobium, 34. 
Epithemia, 47. 
Equisetum, 49. 
Erigeron, 6, 42. 
Eriogonum, 4, 27 
Eriophorum, 24. 
Erodium, 32. 
Erysimum, 30. 
Erysiphe, 11. 
Erythraea, 40. 
Euastrum, 10, 46. 
Euphorbia, 32. 
Eurotia, 28. 
Exoascus, 15 
Festuca, 49. 
Fimbristylis, 24. 
Fragilara. 47. 
Franseria, 6, 42 
Fraxinus, 40. 
Fritillaria, 26. 
Froelichia, 29. 
Gaillardia, 58. 
Geaste1, 18. 
Gentiana, 6, 40. 
Gerardia, 38. 
Gilia, 5, 36, 51, 
Glceosporium, 16 
Gleeotrichia, 8. 
Glyceria, 25. 
Gomphonema, 10, 47 
Gratiola, 53. 
Guepina, 20. 
Gymnosporangium, 4. 
Gymnostomum, 20. 
Habenaria, 26. 
Haplopappus, 43, 53. 
Hebeloma, 49. 
Helenium, 41. 
Heleocharis, 24, 49. 
Helianthus, 6, 42. 
Helminthosporium, 17. 
Hemiarcyria, 45. 
Hemicarpha, #4. 
Heteranthera, 26. 
Hiatula, 49. 
Hicoria, 27. 
Hydnum, 19. 
Hydrodictyon, 9. 
Hypercum, 32, 50. 
Hypholoma, 19. 
Hypoxylon, 47. 
Hypnum, 21. 
Hysterographium, 12. 
Iris, 26 
Irpex, 19. 
Isactis, 46. 
Isaria, 18. 
Iva, 42. 
Juncus, 4, 25, 50. 
Koeleria, 49. 
Kuhnia, 6. 
Krynitzkya, 37. 
Lachnea, 47. 
Lactuca, 41. 
Lathyrus, 34. 
Lecanora, 13. 
Lechea, 50. 
Lecidea, 12. 
Lentinus, 19. 
Lepiota, 18. 
Leptostroma, 16. 
Lesquerella, 31. 
Liatris, 53. 
Limosella, 38. 
Linaria, 53. 
Linum, 32. 
Lippia, 40. 
Lithospermum, 37. 
Loeflingia, 29. 
Lonicera, 53. 
Lupinus. 35. 
Lychnis, 29 
Lycoperdon, 18. 48. 
Lyngbya, 8, 46. 
Lysimachia, 36. 
Marsilia, 21 
Melampsora, 14. 
Melanconium, 16 
Mentha, 39 
Mentzelia, 5, 51. 
Mertensia, 5, 37 
Menyanthes, 40. 
Micrasterias, 10. 
Microcoleus, 45. 
Mimulus, 38. 
Mollugo, 30. 
Monarda, 39 
Monotropa, 36. 
Monolepis, 28 
