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situations generally. Under D. Kneiffii are here included a number of forms for- 

 merly referred to Hypnum aduncum Hedw., but more recently treated by various 

 authors as distinct species. Some of these forms may indeed be specifically dis- 

 tinct, but their status in this respect seems altogether too uncertain to warrant 

 attempting to separate them at the present time. 



Drepanocladus revolvens (Sw.) Warnst.* Frequent in marshes and 

 swamps, and along springy banks. Pine Point Bog; Cecil Bay; Big Stone Bay; 

 Mackinac Island. 



Drepanocladus scorpioides (L.) Warnst. Locally abundant in wet marsh- 

 es. Pine Point; Cecil Bay. 



Drepanocladus Sendtneri (Schimp.) Warnst.* Floating in pools in open 

 swamps; locally abundant near Burt Lake. 



Drepanocladus Sendtneri Wilsoni Warnst.* Smith's Bog. 

 Drepanocladus trifarius (Web. f. & Mohr.) Broth.* Wet sandy marshes; 

 local at Pine Point and Cecil Bay. 



Drepanocladus vernicosus (Lindb.) Warnst. Local in wet, open bog; 

 Mud Lake. 



Heterophyllon Haldanianum (Grev.) Kindb. On rotten logs and earth; 

 common in moist woods. 



Homomallium adnatum (Hedw.) Broth.* On tree bases and gravelly banks; 

 occasional in open woods. Fontinalis Run (Ehlers); Colonial Point. 



Hygroamblystegium filicinum (L.) Loeske.* Springy places and along 

 streams; locally very abundant. Gorge; Mackinac Island. 



Hygrohypnum palustre (Huds.) Loeske. On wave-washed logs and wet 

 rocks; rare at Burt Lake Bluff and on Mackinac Island. 



Hylocomium splendens (Hedw.) Br. & Sch. Common on the ground in 

 moist woods. 



Hypnum Schreberi Willd. On ground, logs, and stumps; one of the com- 

 monest mosses of moist woods. 



Isopterygium elegans (Hook.) Lindb.* Moist woodo, usually on earth 

 or rocks; rare. Mud Lake Hardwoods and Carp Lake Hardwoods (Ehlers); 

 Big Stone Bay. 



Isopterygium turfaceum Lindb. Common in moist woods, usually on 

 decaying logs. 



Plagiothecium denticulatum (L.) Br. & Sch. Gravelly lake bluffs, and 

 on the ground in wet woods; frequent. 



Plagiothecium Roeseanum Br. & Sch.* Occasional on moist shaded banks. 

 Polypody Bluff; Fairy Island; Burt Lake Hardwoods. 



Plagiothecium striatellum (Brid.) Lindb. On the ground or logs; fre- 

 quent in moist woods. Reese's Bog; Burt Lake Hardwoods. 



Ptilium crista-castrensis (L.) De Not. On the ground, logs, and stumps; 

 frequent in moist woods. Reese's Bog; Cecil Bay. 



Rhytidiadelphus triquetrus (L.) Warnst. On the ground in moist woods; 

 common. 



