﻿North American Eurhvxchia 249 



quadrate; costa extending four-fifths the length of the leaf, often end- 

 ing in a spine underneath ; stem leaves deltoid-ovate, 1.8 x I mm., 

 including the filiform acumination which is 0.5— 0.8 mm. long, serru- 

 late at base, nearly entire above, strongly excavate at the decurrent 

 angles ; quadrate and rhomboidal alar cells numerous ; perichae- 

 tial leaves sheathing at base, ovate to oblong-ovate, with a long 



filiform squarrose acumination, ecostate, distantly spinose toothed 

 on the margins above. Sporophyte 1.5—2 cm. high ; seta red-brown, 

 twisted to the right, nearly or quite smooth ; capsule oblong-cylin- 

 dric, unsymmetric and horizontal; urn 1.5 mm. long, 2 : 1, con- 

 tracted below the mouth when dry ; operculum long-rostrate, at 

 least two-thirds the length of the urn; annulus ? segments from a 

 basal membrane which is at least two-thirds the height of the 

 teeth ; segments split between the articulations ; cilia 2 or 3, 

 strongly nodose ; spores finely roughened, about 15 fit. 



Type from California, Bolander. Specimens of this species of 



Bolander's California collections are in the National Museum 



from 4 < Little River (Mendocino Co.?) at the foot of pine tree, no. 



33 2 -" Also in the herbarium of Air. J. M. Holzinger as no. 530. 



This species is very closely related to E. praelongtim Califarnicum 



and greatly resembles it in appearance but is easily distinguished 

 by its nearly smooth seta and nearly entire stem leaves. 



Named in honor of Mrs. E. G. Britton in recognition of her 

 assistance in the preparation of this monograph and of her services 

 to American bryology. 



7- Eurhynchium Oreganum (Sulliv.) Jaeger & Saner. St. Gall. 



Nat. Gesell. 1876-77: 361. 1878. 



Hypnutn Oreganum Sulliv. Mem. Am. Acad. 4: 172. 1849. 



Gametophyte in wide loose mats ; yellow-green above, brownish 

 reen below the surface ; stems procumbent, densely radiculose at 

 points of contact with substratum, 6-25 cm. long; sparingly di- 

 vided, closely and regularly pinnate, often bipinnate ; branches 



L 3---5 cm. long; branches terete-foliate, tapering; branch leaves 

 open, erect, decurrent, broadly cordate-ovate, 1-1.5 x .75-1 mm., 

 acuminate, sharply serrate above, serrulate to base, somewhat 

 concave and slightly plicate, costa stout, extending nearly to base 

 of acumination, ending in a spine at the back ; median cells 

 "near, about 7.1 ; extreme alar cells thick-walled, oblong to rhom- 



XMdal ; stem leaves larger, reaching 2 x 1.3 mm., more broadly 

 ovate, longer acuminate: dioicous ; male branches abundant ; 

 Pengonial leaves ovate, long-acuminate, ecostate, distinctly den- 

 tate; antheridia numerous, clavate ; perichaetial leaves sheathing 

 at ha with reflexed points, ovate to oblong-ovate, abruptly long 



