﻿244 Grout : A Revision of the 



& 



r< 



Flora. 1867. 



Gamitophyte caespitose or in thick, densely intricate mats, 

 green to yellow-green ; stems 2-7 cm. long with long thick stolons, 

 creeping, densely radiculose, sending up numerous fasciculately 

 divided branches; branches short, 2-5 mm. long, julaceous, blunt; 

 branch leaves appressed-imbricate, ovate, acute or rounded-obtuse, 

 0.5-0.6 x 0.36-0.45 mm., serrulate, concave, excavate at the 

 slightly decurrent angles ; costa extending four-fifths length of 

 leaf, often ending in a spine underneath ; median leaf-cells linear 

 to linear-oblong, 5-8: I, apical rhomboidal or nearly circular; 

 area of quadrate alar cells much larger than in any of the allied 

 species ; stem leaves ovate, acute to . long-acuminate, decurrent, 

 0.8-1 x 0.6-0.75 mm - ! leaf-cells narrower and longer, apical 

 cells not differentiated ; costa seldom ending in a spine ; leaves of 

 stoloniferous stems varying greatly in size on the different parts of 

 the stolon : slightly open, without chlorophyll, elongated-triangu- 

 lar, long and narrowly acuminate ; excavate at the angles, very 

 long and narrowly decurrent ; costa slender or wanting, " dioicous 

 or pseudo-monoicous ;" perichaetial leaves sheathing at base, with 

 spreading acumination, oblong-ovate, abruptly long-acuminate ; 

 costa thin or wanting. Sporopkyte 5-10 cm. high ; seta red-brown, 

 smooth, twisted to the right ; capsule red-brown, ovoid to short- 

 oblong, unsymmetnc and inclined ; 1.5 : 1, slightly contracted un- 

 der the mouth when dry ; operculum long- rostrate, nearly as long 

 as the urn ; "annulus of two rows of cells, persistent ;" segments 

 from a basal membrane one-third the length of the teeth ;. cilia 2 

 or 3, appendiculate ; spores finely roughened, 14-18 «, maturing in 



winter. 



Type locality, European. Type at Kew. 



On the ground and rocks in mountainous and boreal regions 

 of western North America, especially in the Rocky Mountain re- 

 gion: Utah, Watson ; British Columbia, Macoun ; Idaho, Leiberg ■ 

 Montana, R. S. Williams ; Colorado, Mrs. S. L. Clark, and Marie 

 Holzinger; Ohio, fidi Schimper, 1. c; S. Dakota, M. A. Thompson. 



Illustrations. Br. & Sch. 1. c. ; Husnot, Muse. Gall. pi. 96, 



f. 8- 9 ; Limpricht, Rab. Krypt. Fl. 4 s ,/ 34 , 



Exsiccati. Macoun, Can. Muse. 500.^ 



Limpricht, /. c, describes the branch leaves as round-obtuse 

 with the costa seldom reaching three-fourths of the length of the leaf, 

 but Rabenhorst's Bryotheca Europea, 1 143, which he cites agrees 

 with the American material in these respects as well as in the di- 



