MICHIGAN ACADEMY OF SCIENCE. 79 



extremes have been variously regarded as synonymous with the 

 typical form, as varieties of it, or as distinct species. Since the 

 indusial characters, texture of fronds, and general appearance is 

 much the same in all the forms the happiest medium probably 

 will be best served by considering them all as varieties of one 

 species. In addition to the tjpe the following varieties are found 

 in Michigan. 



Athyritm filix-femina var. michauxii (Spreng.), N. Comb. 



Aspidium angnstum Willd., Sp. PI., 5, 277, 1810. 



Asplcnium Michauxii Spreng., Syst. 4, 88, 1827. 



Asplcnium Filix-femina var. Michauxii Mett., Fil. Hort. Lips., 

 79, 185G. 



Athyrium asplcnoides var. angustum Moore, Index, 179, 1860. 



Asplcnium, Filix-femina var. angustum D. C. E. Ferns of the 

 South-west. 330, 1878. 



Athyrium Filix-femina var. angastum (Willd.) Farwell, Mich. 

 Acad. Sci., 6,201, 1904. 



Keweenaw Co., No. 757, July 18, 1890. Frequent in rocky situa- 

 tions. Parkedale Farm, No. 3089 a, August 4, 1912. Frequent in 

 dry thickets. 



Athyrium Filix-femina var multidentatum (D()ll) Milde, Fil. 

 Eur., 50, 1807. 



Asplenium Filix-fenvina var. multidentatum Doll, Ehein. Fl., 12, 

 1843. 



Athyrium Filix-femina var. cyclosorum (Ruprecht) Moore, In- 

 dex., 183, 1860. 



The largest and most divided form. KeweenaAV Co., No. 502. 

 July 28, 1887 in moist thickets; common. Detroit, No. 502 a. Oct. 

 16, 1910, in moist thickets; common. 



Athyrium Filix-femina var. latifolium, Moore, Nat. Pr. Brit. Fer. 

 tr. 31B, 1855, Keweenaw county; No. 590, Sept. 5, 1887 in rocky or 

 sterile situations, frequent. 



FiLix (Fuchs) Hill, Family Herbal 171, 1755. 



Dryopteris Adanson, Fam. PI. 2, 20 and 550, 1763. 



Aspidium, Swartz, Schrad. Journ. Bot. 1800, 2, 29, 1801. 



Xephrodium Rich., Cat. Jard. Med. Par. 120, 1801. 



Lastrea Bory, Diet. Class. d'Hist. Nat. 6, 588, 1824. 



Underwood and^ others have adopted Filix, Adanson, (1763) as 

 the oldest post Linnaean name for those ferns that generally have 

 been known under the name of Cystopteris, Bernhardi (1806). 

 According to Christensen, Ludwig used the name Filix in 1757, 

 perhaps in the same sense. Hill, however, in the Family Herbal 



