36 MICHIGAN ACADEMY OF SCIENCE. 



FILIX Adans. Cystopteris Bernh. 



*29. F. bulbifera (L.) Underw. Cystopteris bulbifera (L.) Bernh. Bulblet 

 Fern. Moist shaded hillsides. Locally frequent. Th. 



*30. F. fragilis (L.) Underw. Cystopteris fragiTis (L. ) Bernh. Brittle Fern. 

 Woods and river banks. Ann Arbor, Allmend. Cat.; Flint; Hubbardston; Alma, 

 C. A. Davis; northward to Lake Superior, Whitney. Th. 



31. F. fragilis tenue (Michx.) Cystopteris fi-agilis dentata Hook. Keweenaw 

 Co., and Ypsilanti, 0. A. Farwell. 



32. F. montana (Lam.) Underw. Mountain Cystopteris. Cystopteris montana 

 (Lam.) Bernh. North shore of Lake Superior, Britton & Brown. 



POLYSTICHUM Roth. Aspidium in part. « 



33. P. acrostichoides (Michx.) Schott. Christmas Fern. Aspidium acrostichoides 

 Sw. Shady ground. Th. 



34. P. Braunii (Spenner) F4e. Braun's Holly-fern. Aspidium aculeatum Braunii 

 Doell. Ontonagon Peninsula, Eaton's Ferns of N. A.; Keweenaw Co., O. A. Farwell. 



35. P. Lonchitis (L.) Roth. Holly-Fern. Aspidium Loncliitis Sw. Woods south 

 shore of Lake Superior, Prof. Whitney; Keweenaw Co., 0. A. Farwell. 



DRYOPTERIS Adans. Aspidium in part. 



36. D. Boottii (Tuckerm.) Underw. Boott's Shield-fern. Aspidium Boottii 

 Tuckerm. Alder thickets. Hubbardston; Ann Arbor. Winch. Cat.; Norway, C. F. 

 Wheeler; Keweenaw Co., 0. A. Farwell. 



*37. D. cristata (L. ) A. Gray. Crested Shield-fern. Aspidium cristatum Sw. 

 Swamps. Frequent. Th. 



38. D. cristata Clintoniana (D. C. Eaton) Underw. Aspidium cristatum Clin- 

 tonianum D. C. Eaton. Ann Arbor, Allmendinger Cat.*; Hubbardston; found at 

 Lake Nipigon, Ont., Macoun; Alma, C. A. Davis. Infrequent. Th. 



39. D. Filix-Mas (L.) Schott. Male Fern. Aspidium Filix-mas Sw. Rocky 

 woods. Keweenaw Peninsula, Lake Superior. A. Gray. 



40. D. fragrans (L.) Schott. Fragrant Shield-fern. Aspidium fragrans Sw. 

 Crevices of shaded cliffs. Isle Royale, and Keweenaw Peninsula, Dr. Lyons. 



*41. D. Goldieana (Hook.) A. Gray. Goldie's Fern. Aspidium Goldieanum 

 Hook. Moist woods. Flint; Hubbardston, C. F. Wheeler; Owosso, G. H. Hicks; 

 Black River, St. Clair Co., C. K. Dodge; Alma, C. A. Davis. 



*42. D. marginalis (L.) A. Gray. Evergreen Wood-fern. Aspidium marginals 

 Sw. Hillsides in rich woods. S. Haven, Bailey; Flint; Hubbardston and north- 

 ward. Frequent. Th. 



*43. D. Noveboracensis (L.) A. Gray. New York Fern. Aspidium Noveboracense 

 Sw. Swamps. Ann Arbor, Allmendinger Cat.; Macomb Co.; Hubbardston; Gore 

 Bay, Manitoulin Island, J. Bell. Canadian Cat. L. P. 

 44. D. simulata Davenport. Belle Isle, 0. A. Farwell. 



*45. D. spinulosa (Retz) Kuntze. Spinulose Shield-fern. Aspidiuyn spinulosum 

 Sw. Shady woods. Flint; Hubbardston; L. Superior, D. C. Eaton, Ferns of 

 N. A. Th. 



46. D. spinulosa dilatata (Hoffm.) Underw. Aspidium spinulosum var. dilatatum 

 Hook. Woods. Ann Arbor, Allmendinger Cat.; Macomb Co.; Flint; Hubbardston; 

 Petoskey, and northward. Th. 



*47. D. spinulosa intermedia (Muhl.) Underw. Aspidium spinulosum var. inter- 

 mediiim D. C. Eaton. Woods. Common. Th. 



*48. D. Thelypteris (L.) A. Gray. Marsh Shield-fern. Aspidium Thelypteris 

 Sw. Swamps. Frequent. Th. 



PHEGOPTERIS Fee. 



*49. P. Dryopteris (L.) Fee. Oak-fern. Open woods. Frequent north of lat. 

 43°, especially under pines. Th. 



*50. P. hexagonoptera (Michx.) Fee. Broad Beech-fern. Beech woods. Flint; 

 Hubbardston; Ann Arbor, Allmendinger Cat.; Keweenaw Co., 0. A. Farwell. Fre- 

 quent. Th. 



