Barbula. MUSCI. 371 



in a short point ; perichsetial leaves strongly curved and margins revolute : capsule 

 with simple persistent annulus, and loosely twisted peristome cleft to the base. 

 Bot. Zeit. xx. 338. 



San Jose Valley, J. Bauer. 



) -t Peristome once or twice twisted or less. 



14. B. rigidula, Schimp. Closely resembling B. fallax, but growing on rocks 

 and stones, with a h'rmer capsule, narrow annulus, and the teeth of the peristome 

 shorter and scarcely at all twisted. Syn. Muse. 2 ed. 206. Didymodon rigidulum, 

 Hedw. Muse. Frond, iii. 8, t. 4. Trichostomum rigidulum, Smith ; Bruch & Schimp. 

 1. c., t. 176; Wilson, 1. c., t. 20. 



On rocks subject to overflow on Russian River, opposite Ukiah (Bolander) ; Vancouver Island 

 (Lyall) ; European. 



15. B. semitorta, Sulliv. Stems loosely cespitose, 3 or 4 lines high, sub- 

 simple, rooting at base : leaves crowded above, spreading horizontally from an erect 

 clasping base, linear-lanceolate, concave with flat margins and the firm costa ceasing 

 at the apex : capsule cylindrical, with slender beaked operculum scarcely covered 

 by the calyptra, narrow annulus, and rather long peristome twisted half-way round. 



-Pacif. R. Rep. iv. 186, t. 3. 

 Near Benicia, Bigelow. 



16. B. brachyphylla, Sulliv. Stems densely cespitose, 8 to 12 lines high, 

 fastigiately branched, rooting the whole length : leaves dark brownish green, firm 

 and thick, spreading, ovate, shortly and obtusely acuminate, stoutly costate to the 

 apex and the margins recurved ; areolation minute, uniform : capsule cylindrical, 

 with obliquely beaked operculum more than covered by the calyptra, a simple 

 annulus, arid the peristome twisted scarcely half-way round. Pacif. R. Rep. iv. 

 186, t. 2. 



Near Benicia, with the last, Bigelow. 



17. B. purpurea, Muell. Stems very short, forming small very rigid purple 

 mats : leaves few, firm, shortly lanceolate from an oblong base, concave, with 

 strongly revolute margins and stout excurrent costa : capsule minute, elliptical, with 

 conical operculum as long as the capsule, a narrow persistent annulus, and scarcely 

 twisted elongated peristome : calyptra reaching the base of the capsule. Flora, 

 Iviii. 78 (1875). 



With B. vircsccns, upon rocks near Oakland, Bolander. 



18. B. vinealis, Bridel. More densely cespitose and less brown than B. fallax, 

 with more crowded longer and more acuminate leaves, somewhat flaccid and crisped 

 when dry, the margins less revolute and nearly flat above : capsule thicker and 

 more elliptical, with shorter operculum, a rather broad double annulus, and a shorter 

 nearly white peristome upon a broader basilar membrane, twisted once or l times. 



-Bruch & Schimp. 1. c., t. 148 ; Sulliv. & Lesq. 1. c., n. 90 b (2 ed. n. 130, 131). 



Around San Francisco, on rocks and stones near the bay, very common and variable (Bolander) ; 

 Oakland and Soiiora, Bigelow. Common also in Europe. Some of the following species are 

 scarcely distinct. 



19. B. artocarpa, Lesq. Densely cespitose: stems slender, short, subsimple : 

 lower leaves short, lanceolate from an ovate base or short-subulate, the stout costa 

 running to the apex; the upper longer and more narrowly lanceolate-subulate; 

 perichsetial leaves broader, clasping at base, crowded above, erect ; areolation at 

 base looser and chlorophyllose : capsule ovate-cylindrical, short, slender, contracted 

 at the mouth, with a long-beaked curved operculum and broad simple persistent 

 annulus : teeth slender, whitish, once twisted. Trans. Anier. Phil. Soc. xiii. 4 ; 

 Sulliv. & Lesq. 1. c., n. 133. 



On Monte Diablo, and northward to Ukiah, Bolander. 



