MICHIGAN ACADEMY OF SCIENCE. 83 



FiLix spiNULosA var. concordiana (Davenp.), N. Comb. 



Dryopteris spinulosa (Muell.) Swz, var. Concordiana (Davenp.) 

 Eastman, New England Ferns, 1904, and in Gray's New Man., 43, 

 1908. 



FiLix SPINULOSA var. dilatata (Hoff.), N. Comb. 



Polypodium dilafatnm Hoff., Deutsch. Fl., 2, 7, 1795. 



The 7^. spimilosa var. dilatata Farwell, Mich. Acad. Sci., 6, 209, 

 1904, is the var. Americana. 



FiLix SPINULOSA var. intermedia (Muhl.), N. Comb. 



Polypodium intermedium Muhl. ex Willd., Sp. PI., 5, 262, 1810. 



FiLix SPINULOSA var. pittsfordensis (Slosson), N. Comb. 



Dryopteris Pittsfordensis Slosson, Rhodera, 6, 75, 1904. 



Cystopteris Filix-fragilis (Lin.) Chiovenda. 



A common fern in rocky woods. Besides the typical form three 

 others are frequently met with. 



Cystopteris filix-fragilis var. lobulato-dentata (Koch), N. 

 Comb. 



C. fragilis var. loiulato-dentata Koch., Syn., Ed. 2, 980, 1845. 



C. fragilis var. dentata Hooker, Sp. Fil., I, 198, 1846. 



C. Filix-fragilis var. tenuis (Mx.) Farwell, Mich. Acad. Sci., 6, 

 200, 1904. 



The earliest varietal name is that of Koch. 



Keweenaw Co., No. 830, August 30, 1890, in rocky woods. Fre- 

 quent. Ypsilanti, No. 830a, June 11, 1892, in moist woods. 



Cystopteris filix-fragilis var. angustata (Hoff.), N. Comb. 



Polypodium fragilis var. angustatum Hoff., Roem. et Uster. Mag., 

 IX, Pt. 11, t. I, Fig. 14d, 1790. 



C. fragilis suhvar. angustata Koch. Syn., Ed. 2, 980, 1845. 



C. fragilis var. angustata Luerssen, Farnpfl, 459, 1889. 



Keweenaw Co., No. 4051/4, July 8, 1886, in rocky woods ; frequent. 



Cystopteris filix-fragilis var. laciniata, (Davenp.), N. Comb. 



C. fragilis var. laciniata Davenp. in D. C. E., Ferns of N. Amer., 

 2, 52, 1880. 



Keweenaw Co., No. 8301/^, August 30, 1890, in rocky woods ; rare. 



These forms or varieties are well illustrated on Plate 53 of 

 Eaton's Ferns of N. America. 



OPHIOGLOSSACEAE. 



0]»hioglossum vulgatum, Lin. 



A variable species whicli, taken as a whole, has an equally vari- 

 able habitat. I have found it in Keweenaw Co., but it is not fre- 

 quest even when met with. The typical species has a sessile sterile 



