﻿North American Eurhyxchia 233 



This latter form I have not yet seen fruiting. It appears from 

 the data at hand to grow on moist rocks. It is widely distributed, 

 occurring in Ontario, Connecticut, New York, Pennsylvania and 

 Missouri. If it should prove to be a good variety and not merely 

 habitat form, I would suggest the name B. graminicolor acuminata. 



EurJiyncliium subscabridum Kindb. approaches this form, and, 

 according to the opinion of M. Cardot and myself, is in no way 

 distinguishable from forms of B. graminicolor. 



M. Cardot has seen Bridel's type of Hypnum graminicolor, 

 and has very kindly communicated notes and camera lucida draw- 

 ings of the leaves. We are both agreed that it is identical with 

 Hypnum Sullivantii Spruce. 



EURHYNCHIUM Br. & Sch. Bry. Eur., fasc. 57-61. 1854. 



Gametophyte well developed, never minute, green to yellow- 

 green, growing in wide loose mats, or sometimes in dense tufts. 

 Stems prostrate or creeping, more or less pinnately branched, 

 sometimes closely and regularly pinnate, usually somewhat stolo- 

 niferous ; central strand present in all the species. Branch leaves 

 pluriseriate, not complanate or secund, acuminate to obtuse, ser- 

 rate, concave, more or less plicate ; costa single, extending to the 

 middle or beyond, usually ending in a spine underneath ; median 

 cells linear, 8-12: 1, basal broader and shorter, alar quadrate or 

 round, apical cells strongly differentiated and rhomboidal to cir- 

 cular in the group of E. strigosum. Stem leaves ovate, acute to 

 long and slenderly acuminate. Paraphyllia sparingly present in 

 some species. Sporopliyte, as in Brachytheciutn, except the opercu- 

 lum, which is very long rostrate, equaling %—y$ the length of the 

 urn, except in the group of E. myosuroides. 



The species of this genus are quite closely related to Sclcro- 

 podium and Brachytheciinn, and it is difficult to give any general 

 character, except the long rostrate operculum, which distinguishes 

 this genus from BrachytJiccium. It is distinguished from Scle- 

 ropodium by the broader, shorter leaf-cells. 



The genus can be divided into three groups : 



I. The group of E. strigosum, including E. strigosum, E. ro- 

 bustum, E. fallax, E. diversifolium, and E. Mans, This group is 

 easily distinguished by the differentiated apical cells. 



II. The group of E. praelongum, including IL praclongam, E. 



Oreganum, and & Brittoniac. This group is characterized by the 



