640 PROCEEDINGS OF THE NATIONAL MrSEUM. vol.xxiii. 



Dryopteris rigida arguta(Kaulf.) Underw. Our Native Ferns ed. 4. 116, 



1.S1I3. 



Aspidium argutmn Kaulf. Enum. Fil. 242. 1824. 



Aspklimn rigidum var. argiitumD. C. Eaton inU. S. Geog. Siirv. W. 100th Merid. 

 6 : 333. 1879. 

 California to Alaska, chiefly near the coast. 



Dryopteris spinulosa (Retz.) Kuntzc, Rev. Gen. PI. 2 ; S13. ISOl. Spiny 



SHIELD FERN. 



PolyjMdium spinulosum Retz. Fl. Scand. ed 2. 250. 1795. 

 Aspidium spinulosum Sw. Schrad. Journ. Bot. 1800^ : 38. 1801. 

 Newfoundland to Alaska, south to Virginia, Kentucky, Nebraska, and Wash- 

 ington. 

 Dryopteris spinulosa intermedia (Muhl.) Undevw. Our Native Ferns ed. 

 1. 116. 1893. Common spiny fekn. 



Aspidium intermedium Muhl. ; Willd. Sp. PI. 5 : 262. 1810. 



Aspidium spinidosum var. intermedium. D. C. Eaton in A. Gray, ]\Ianual ed. 5. 665. 



1867. 

 Dryopteris intermedia A. Gray, Manual ed. 1. 630. 1848. 

 Labrador to Alaska, south to North Carolina and Tennessee. 



Dryopteris spinulosa dilatata (Hotim.) Underw. Our Native Ferns ed. 

 1. 116. 1893. Spreading wood-fern. 



Polypodium dilatatum Hoffm. Deutsch. Fl. 2 : 7. 1795. 

 Aspidium, spinulosum var. dilatcdum Hook. Brit. Fl. 444. 1830. 

 Dryopteris dilatata A. Gray, Manual ed. 1. 631. 1848. 

 Newfoundland to Alaska, south to California, Montana, and Virginia; mostly 

 confined to the mountains. 

 Dryopteris boottii (Tuckerm.) Underw. Our Native Ferns ed. -1. 117. 

 1893. Boott's wood-fern. 



Aspidium boottii Tuckerm. Hovey's Mag. Hort. 9 : 145. 1843. 

 Aspidium spinulosum var. hoottii D. C. Eaton in A. Gray, Manual ed. 5. 665. 1867. 

 Nova Scotia, southern Ontario, and Minnesota, south to northern Virginia.* 



Dryopteris patula (Sw.) Underw. Our Native Ferns ed. 1. 117. 1893. 

 Aspidium patulum Sw. Kongl. Vetensk. Akad. Handl. 1817 : 74. 1817. 

 Huachuca Mountains, Arizona (Lemmon). 



POLYSTICHUM Roth, Tent. Fl. Germ. 3 ; 69. 1800. 



Polystichum acrostichoides (Michx.) Schott, Gen. Fil. 183-1. Christ- 

 3IAS FEKN. Evergreen wood-fern. Shield fern. 

 Nephrodium acrostichoides Michx. Fl. Bor. Am. 2 : 267. 1803. 

 Aspidium acrostichoides Sw. Syn. Fil. 44. 1806. 

 Dryopteris acrostichoides Kuntze, Rev. Gen. PI. 2 : 812. 1891. 

 Nova Scotia and New Brunswick to Wisconsin, Iowa, Mississippi, and Florida. 

 The variable form known as var. schweinitzii (Beck), or the \aT.ineisum A. 

 Gray, has the range of the type. 

 Polystichum munitum (Kaulf.) Presl, Tent. Pterid, 83. 1836. 

 Aspidium munitum Kaulf. Enum. Fil. 236. 1824. 

 Dryopteris munita Kuntze, Rev. Gen. PI. 2 : 813. 1891. 

 California, Oregon, and Idaho, northward to Alaska. 



* Reported from Loring, Alaska, by Miss Grace E. Cooley in Bull. Torr. Clul) 19 : 

 246. 1892. 



