BARTRAMIEI. 169 



1. C. boreale, Sw. ; densely tufted; leaves lanceolate, 

 strongly acuminate, serrated ; nerve excurrent ; lid about half 

 as long as the sporangium. — Hook. 1% Wils. t. x. ; Eng. Bot. t. 

 1135.; (Plate 15, fig. 8) ; Sommerf. n. 108. 



On the ground, at the tops of the Scottish alps. Bearing 

 fruit in early autumn. 



Dioicous; forming dense, fastigiate, rather glaucous tufts. 

 Stems matted together by brown rootlets, more or less branched; 

 leaves crowded in five rows so as to make the branches penta- 

 gonal, lanceolate, strongly acuminate ; cells quadrate or rect- 

 angular ; veil attached for a long time, hood-shaped ; fruitstalk 

 ^-1 inch long ; sporangium obovate, striate ; spores large, 

 brown, slightly granulated. 



The peristome is a beautiful object under the microscope. 

 The male flowers are subdiscoid. 



43. BAETRAMIA, Hedw. 



Sporangium subglobose, sulcate when dry, erect cernuous 

 or pendulous, inserted somewhat obliquely ; veil small, hood- 

 shaped, fugacious ; peristome double, single, or wholly absent. 

 Perennial tufted Mosses, mostly with papillose leaves. 



1. B. ithyphylla, Brid. ; synoicous; leaves erecto-patent 

 from a sheathing base, lanceolato-subulate, rigid, toothed, 

 straight when dry ; nerve very strong and broad ; sporangium 

 oblique ; inner peristome with imperfect processes.— Hook, fy 

 Wils. t. xxiii.; Eng. Bot. t. 1710.; (Plate 16, fig. 1); Moug, 

 $ Nest. n. 622. 



On alpine and subalpine rocks. Bearing fruit in June. 



Forming bright-green tufts. Stems dichotomous, fastigiate ; 

 leaves lanceolato-subulate above, spreading from a broad white 

 or pale erect sheathing base; nerve very strong, occupying 

 the greater part of the leaf; fruitstalk 1 inch long ; sporan- 



