MIDDLESEX FLOEA. 145 



POGONATUM, Beauv. 



P. brevicaule, Beauv. 

 ChelDisford (Rev. J. L. Eussell), as Polytrichum Pennsylvanicum, 

 Hedw. 



POLTTKICHTJM, L. 



P, formosum, Hedw. 



Maiden (H. A. Young) ; Waltham (Mrs. S. E. French). 

 P. piliferum, Schreb. 



Common. 

 P. juniperinum, Willd. 



Common. 

 P. commune, L. 



Common. 



Diphtscium:, Mohr. 



D. foliosum, Mohr. 

 Common. 



BUXBAUMIA, Hall. 



B. aphylla, L. 



Cascade rooks, Melrose (H. A. Young) ; Waltham (Mrs. S. E. 

 French). 



FONTINALIS, Dill. 



F. antipyretica, L., var. gigantea, Sulllv. 

 Common. 



DiCHELTMA, Myrin. 



D. capillaceum, Bruch & Schimp. 

 No. Billerica (H. A. Young) ; Cambridge (T. P. James) ; Waltham 

 (Mrs. S. E. French) ; Natick (Miss C. E. Cummings). 



D. pallescens, Bruch & Schimp. 

 Natick (Miss C. E. Cummings). 



D. subulatum, Myrin.? 

 Eev. J. L. Eussell reports Fontinalis subulata, Beauv., which is a 

 synonym of this species, as occurring at Chelmsford, "hanging oh 

 bushes, principally Cephalanthus occidentalis, L., in partially 

 dessicated mill-ponds, and full of fruit in Nov." It is probable that 

 there is some mistake in the determination. 



Leptodon, Mohr. 



L. trichomitrion, Mohr. 

 Waltham (Mrs. S. B. French). 



Neckeka, Hedw. 



N. pennata, Hedw. 

 Meh-ose (H. A. Young) ; Waltham (Mrs. 8. E. French). 



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