326 



THE POTOMAC OR YOUNGER MESOZOIC FLORA. 



GENERAL REMARKS AND CONCLUSIONS. 



The following list gives all the different fossil plants found in the 

 Potomac formation of which figures and descriptions are given in this 

 work : 



LIST OF POTOMAC FOSSIL PLANTS. 



CRYPTOGAMS. 



EQUISETE^. 

 Equisetum L. 



Page. 



1. E. Virgiuiculu, sp. nov .. 63 



2. E.Lyelli Maotell 65 



3. E. Marylandicum, sp. nov 65 



3(1. Equisetum, sp 65 



36. Efiuisetum, sp 66 



FiLICES. 



Cladolphlebis Brongn., ex parte. 



4. C. constricta, sp. nov 68 



.5. C.latifolia, sp. uov 69 



6. C. Virginiensis, sp. nov 70 



7. C. denticulata, sp. nov 71 



8. C. falcata, sp. nov 72 



9. C. parva, sp. uov 73 



10. C. acuta, sp. nov 74 



11. C. oblongifolia, sp. nov 74 



12. C. crenata, sp. nov 75 



13. C. species ? , sp. nov 76 



14. C. inclinata, sp. nov 76 



15. C. distaus, sp. nov 77 



16. C. species ? ,sp. nov 77 



17. C. alata, sp. nov 77 



18. C. species ?, sp. uov 78 



19. C. rotundata, sp. nov 78 



20. C. spbenopteroides, sp. uov 79 



21. C. petiolata, sp. nov 80 



22. C. ina?quiloba, sp. nov 80 



23. C. pachyphylla, sp. nov 80 



24. C. brevipenuis, sp. nov 81 



25. C. species ? , sp. nov 81 



Pecopteris Broug. 



26. P. Virginiensis, sp. nov 82 



27. P. strictinervis, sp. uov 84 



28. P. ovatodeutata, sp. nov 85 



29. P. microdonta, sp. nov 85 



30. P. constricta, sp. nov 86 



31. P. brevipennis, .sp. nov 86 



32. P. socialis Heer 87 



33. P. augustipennis, sp. nov 87 



34. P. Bro wniana Danker 88 



35. P. pachyphylla, sp. no v 88 



Sphenopteris Brong. 



Page. 



36. S. tbyrsopteroides, sp. uov 89 



37. S. acrodeutata, sp. nov 90 



38. S.latiloba, .sp.uov 90 



39. S. Mautelli Brongn 91 



40. S. apatulata, sp. nov 93 



41. S. pachyphylla, sp. no v 93 



ASPIDIU.M Sw. 



42. A. Fredericksburgense, sp.uov 94 



43. A. ellipticum, sp. nov 95 



44. A. heterophylluiu, sp. nov 96 



45. A. Virgiuicum, sp. uov 97 



46. A. augustipinuatum, sp. uov 98 



47. A. cystopteroides, sp. no v 99 



48. A. Oerstedi Heer 99 



49. A. oblongifolium, sj). nov 100 



50. A. parvifolium, sp. uov 100 



51. A. piuuatifidum, sp. nov. 101 



52. A.Dunkeri Schiniper.sp 101 



53. A. deutatum, sp. uov 102 



54. A. niacrocarpuiu, sp. uov 103 



55. A. microcarpum, sp. nov 103 



POLYPODIUM L. 



56. P. fadyenioides, sp. nov 104 



57. P. deutatum, sp. uov 105 



ACKOSTICHU.M L. 



58. A. crassifoliura,8p. mv 105 



ACROSTICHOPTERIS gen. nov. 



59. A. longipennis, sp. nov 107 



60. A. densifolia, sp. nov 107 



61. A. parvifolia, sp. nov 108 



62. A. parcelobata, sp. nov ,. 108 



63. A. cyclopteroides, sp.uov 109 



ASPLENIUM L. 



64. A. dubinm, sp. uov 109 



Thinnfeldia Ett. ex parte. 



65. T. variabilis, sp. nov 110 



66. T. graunlata, sp. nov Ill 



67. T. rotundiloba, sp. nov Ill 



