18 BOTANY OF MICHIGAN 



Pteris aquilina L. Common brake. Abundant throughout in damp, 

 dry, open or shaded ground. 



Asplenium filix-femina (L.) Bemh. Lady fern. In damp shaded 

 places throughout. Plentiful. 



Aspidium thelypteris (L.) Sw. Marsh shield-fern. Very common 

 throughout in damp marshy places or rich open woods. 



Aspidium marginale (L.) Sw. Evergreen wood-fern. Rich shaded 

 ground. Frequent throughout. * 



Aspidium cristatum (L.) Sw. Crested shield-fern. In swampy open 

 or partially shaded places. Frequent. 



Aspidium spinulosum (O. F. Miiller) Sw. Spinulose shield-fern. Rich 

 open woods throughout. Common. 



Aspidium spinulosum intermedium (Muhl.) D. C. Eaton. American 

 shield-fern. Damp rich woods and thickets. Frequent throughout. 



Cystopteris bulbifera (L.) Bemh. Bulblet Cystopteris. Common on 

 rocky ground and in shaded places. Frequent throughout. Very abun- 

 dant on Mackinac Island. 



Cystoperis fragilis (L.) Bemh. Brittle fern. Frequent in rich woods 

 throughout. 



Onoclea sensibilis L. Sensitive fern. Damp, open or shaded 

 ground. Frequent and often abundant throughout. 



Onoclea slruthiopteris (L.) Iioffm. Ostrich fern. Fine specimens near 

 Alpena and near Rogers in Presque Isle County. In alluvial shaded 

 ground along streams. Throughout. 



N 



OSMUNDACEAE. Flowering Fern Family 



Osmunda regalis L. Flowering fern. Wet swampy open or shaded 

 places. Seldom abundant. 



Osmunda claytoniana L. Clayton's fern. Noticed near Omer, Arenac 

 County, Harrisville, Alcona County, and Rogers, Presque Isle County. 

 Frequent throughout in open or partially shaded rich ground. 



Osmunda cinnamomea L. Cinnamon fern. In damp open or shaded 

 ground throughout, but seldom abundant. Fine specimens observed. 



OPHIOGLOSSACEAE. Adder's Tongue Family 



Botrychium virginianum, (L.) Sw. Rattlesnake fern. Rich shaded 

 ground. Plentiful throughout. 



EQUISETACEAE. Horsetail Family 



Equisetum arvense L. Common horsetail. Damp sandy open ground. 

 Common throughout. 



Equisetum sylvaticum L. Wood horsetail. Damp shaded ground. 

 Frequent throughout. 



