130 BOTANY OF MICHIGAN 



Onoclea struthiopteris (L.) Hoffm. Ostrich fern. Abundant along the 

 Tahquamenon River above Emerson near lower falls, and occasionally 

 throughout. Fine specimens traced along streams. 



Osmunda regalis L. Royal fern. In wet and often shaded ground 

 throughout. Common. 



Osmunda claytoniana L. Interrupted fern. In rich open or slightly 

 shaded ground throughout. Fine specimens noted. 



Osmunda cinnamomea L. Cinnamon fern. Damp rich open or shaded 

 ground throughout. Fine specimens. 



OPHIOGLOSSACEAE. Adder's Tongue Family 



Botrychium obliquum Muhl. Ternate grape fern. In sandy, slightly 

 shaded ground near Whitefish Point. Apparently rare. 



Botrychium. virginianum (L.) Sw. Rattlesnake fern. Common 

 throughout in woods and thickets. 



EQUISETACEAE. Horsetail Family 



Equisetum arvense L. Common horsetail. Common throughout. 

 Often on sand dunes acting as a sand binder. 



Equisetum sylvaticum L. Wood horsetail. Damp ground in swamps 

 and along streams. Abundant throughout. 



Equisetum fluviatile. Pipes. Wet open places, shallow water, ditches 

 and swamps. Often abundant. 



Equisetum hyemale L. Common scouring rush. Often on sides of 

 sand dunes where it acts as a good sand binder. Common in dry, sandy, 

 open ground. 



Equisetum variegatum Schleich. Variegated equisetum. Sandy 

 beaches of Lake Superior, often acting as a sand binder. Frequent. 



Equisetum scirpoides Michx. Sedge-like equisetum. In woods and 

 open places in tamarack-black spruce swamps. Frequent. 



LYCOPODIACEAE. Club Moss Family 



Lycopodium lucidulum Michx. Shining club moss. Damp woods 

 throughout. Abundant near lower falls of the Tahquamenon River 

 above Emerson. 



Lycopodium inundaium L. Bog club moss. Usually in open damp 

 sandy ground. Plentiful. 



Lycopodium annotinum L. Stiff club moss. Beech-maple-birch 

 woods. Very abundant throughout. 



Lycopodium clavatum L. Common club moss. Dry open woods and 

 steep banks of streams. Occasional throughout. 



Lycopodium obscurum L. Ground pine. Beech-maple-birch woods. 

 Frequent. 



