HYPNACEAE IO9 



P. Muellerianum Sch. "Rocky ravines, N. Y. & N. J.," 

 Muse. App. 351; Pascack and Closter, N. J., Austin, Bx!; Ham- 

 den, Bry. Ct. This rare species usually grows in damp crevices 

 of shaded ledges. 



P. Roeseanum (Hampe) B. & S. A subspecies of P. denticu- 

 latum, frequent on damp peaty soil and shaded rocks and 

 banks, Closter, N. J.; Gowanus and Glen Cove, L. Id.; Bulls 

 Head and Tottenville, S. Id.!! 



P. Ruthei Limpr. Common on peaty soil along the south 

 shore of L. Id. (N. Am. Musci PI. 55); Bulls Head, S. Id., and 

 probably frequent along the coast. A subspecies of P. dentic- 

 ulatum. 



P. striatellum (Brid.) Lindb. Very common on hummocks 

 in swamps. Summer. 



P. sylvaticum (Huds.) B. & S. Frequent in damp woods. 

 There are innumerable intergradations between this and P. 

 denticidatum. 



P. turfaceum Lindb. "On the ground in woods and on de- 

 cayed wood in cedar swamps, Palisades, N. J.," Muse. App. 

 356; decayed trunk of pollarded willow, Richmond, S. Id.!!, 

 and also stumps at New Dorp, E. G. B., Bx! 



(P. passaicense Aust., Muse. App. 353, from Bergen Co., N. 

 J., is probably a form of P. latebricolor . P. subfalcatum, Muse. 

 App. 366 is regarded by Kindberg as a form of P. denticidatum.) 



AMBLYSTEGIELLA Loeske 



Usually treated as a section of Amblystegium., but differing 

 from the true Amblystegia in the smaller size, lack of central 

 strand and in the slightly developed costa, which is either want- 

 ing or very faint. Nearly all our species, except adnata, have a 

 tendency to become stoloniferous and the leaves on the stolons 

 are much smaller than the normal leaves. Therefore, well- 

 developed leaves should be sought for study. 



1 — Plants of the size and habit of Hypnum reptile; leaves reaching more 



than 1 mm. in length adnata 



Plants minute; leaves not over 0.6 mm. in length 2 



