185 



Idaho, merely stating that the beard in the western plant is 

 white. Heller, in his Catalogue, gave it specific rank, and it 

 really seems possible that this is correct. The type locality of 

 the Linnean species C. hulhosa (L.) House is Lapland, and I do 

 not know what the detailed characters of typical specimens 

 may be. Since the Old World plant extends through Russia 

 to Siberia, one would expect to find the west coast form identical 

 with it; but in the absence of proof of this, we must use the 

 name occidentalis, given by Holzinger. 



The Colorado form, described from Gresham in the place 

 cited in the footnote, certainly differs from the northeastern 

 as well as the northwestern plant in lacking the spots on the 

 apical expansion of the lip; it may take the name C. hulbosa var. 

 coloradensis. 



It is a singular thing that in the excellent new Flora of the 

 Northwest Coast, by Piper and Beattie, the plant of the north- 

 eastern states is described, and not the occidentalis form at all! 

 Does such a form as this description indicates really exist any- 

 where in the northwest? T. D. A. Cockerell 



Boulder, Colorado, 

 May 4, 1916 



REVIEWS 



Dunham's How to Know the Mosses* 



This is a popular guide to the mosses of the Northeastern 

 United States, containing keys to eighty genera and short de- 

 scriptions of over one hundred and fifty species with special 

 leference to the distinguishing characteristics that are apparent 

 without the aid of a lens. 



It is illustrated by line drawings in the text and seven plates, 

 which will be found helpful to the beginner. Two keys based on 

 the leaf and capsule characters and the introduction and first 

 explanatory chapters aim to make it easy to obtain a non- 

 technical acquaintance with the mosses. This book should be 

 very helpful in introducing the mosses to a large circle of admirers. 



Elizabeth G. Brittox 



* By Elizabeth Marie Dunham, pp. 1-287. Houghton, IMifflin Co., 1916. 

 Price $1.25 net. 



