Bruchia. MUSCI. 359 



Only the. following species are found in America, both also Euroj)ean ; other species belong to 

 the Old World. The genus approaches Pottia, except in the want of an operculum. 



1. P. cuspidatum, Schreb. Densely clustered; stems simple or somewhat 

 branched, about 2 lines high : leaves densely crowded at least above, oblong-lanceo- 

 late and long-acuminate, cuspidate with the excurrent costa, carinate-concave, the 

 margin subrevolute below, more or less papillose on the back toward the apex : male 

 flower with one perigonial leaf : capsule immersed, globose or rarely ovate, shortly 

 and obtusely apiculate, chestnut-colored. Bruch & Schimp. Bryol. Eur. t. 5 ; 

 Schimp. Syn. Muse. 2 ed. 16, t. 1 ; Sulliv. in Gray's Manual, 2 ed. 615, t. 1. 



At Mission Dolores, with the preceding (Bolander) ; common in the Atlantic States and through- 

 out Europe, and in most temperate regions, in various forms. 



2. P. bryoides, Dickson. Cespitose; stems 2J to 5 lines high, simple or 

 branched, at length decumbent and reproduced from the base : lower leaves minute 

 and remote, the upper much larger, connivent or somewhat spreading, oblong- to long- 

 lanceolate, concave, cuspidate : male flower terminal, becoming apparently axillary : 

 capsule emergent or wholly exserted, erect upon a straight pedicel, oval to oblong- 

 elliptical with an oblique blunt beak, brown, dull. Bruch & Schimp. 1. c., t. 6; 

 Berkeley, Brit. Moss. t. 24, fig. 8. 



Var. piliferum, Schimp. Leaves shorter, piliferous : capsule ovate, on a shorter 

 pedicel. Syn. Muse. 2 ed. 19. 



South side of Oakland Hills (Bolander), the variety ; also European. 



4. PLEURIDIUM, Bridel. 



Annuals or the stem at length decumbent arid producing innovations or flagelli- 

 form branches below the apex. Leaves lanceolate or lance-subulate, shining, firmly 

 costate, remotely and obtusely serrate toward the apex, the areolation oblong-hex- 

 agonal below, narrower above. Inflorescence monoecious or bisexual. Calyptra small, 

 cucullate. Capsule immersed or exserted upon a short pedicel, becoming lateral after 

 the branching of the stem, ovate-globose or ovate, shortly apiculate, smooth and 

 shining. Astomum, Hampe. 



Ten species are described, three European, three North American, the rest of the southern 

 hemisphere. 



1. P. subulatum, Bruch & Schimp. Stem 1 to 3 lines high, rarely branched : 

 upper leaves crowded, erect-spreading and somewhat secund, much exceeding the 

 capsule, lance-subulate and subsetaceous, not carinate, the broadish costa ceasing 

 near the obsoletely serrate apex : antheridia naked in the axils of the perichaetial 

 leaves : capsule ovate-globose, pale brown. Bryol. Eur. t. 9. Phascum subulatum, 

 Linn. ; Hedw. Muse. Frond, i. 93, t. 35 ; Engl. Bot. t. 2177; Wilson, Bryol. Brit. 

 t. 5 ; Austin, Torr. Bot. Bull. vi. 142. 



Var. Stem stoloniferous : leaves broader at base, more convolute, and smooth 

 upon the back ; the inner perichsetial leaves not narrower, more abruptly contracted. 

 P. snbulatum, Lesq. in Trans. Am. Phil. Soc. xiii. 2, and Mem. Calif. Acad. i. 5 ; 

 Sulliv. & Lesq. Muse. Am.-Bor. Exsicc. 2 ed. n. 39, in part. P. stramineum, Lesq. ; 

 Austin, 1. c. 



The variety at San Rafael, by ditches and on dry hills, Bolander. Intermediate between the 

 typical European P. subulatAim and the Atlantic States form (also referred to it by Sullivaiit), 

 which Austin has distinguished as P. Ravencllii. 



5. BRTJCHIA, Schwaegr. 



Cespitose or densely clustered, with the habit of Pleuridium: stems simple or 

 sparingly branched : leaves shining, the lower minute and remote, the upper crowded 



