412 MUSCI. Hypnvm. 



7. H. arenarium, Lesq. Loosely and broadly cespitose ; stem sparingly irreg- 

 ularly branched, the secondary branches short and erect, or longer, filiform and 

 rooting : leaves crowded, erect, lanceolate, acuminate, the reflexed margin subserru- 

 late, costa ceasing below the apex, areolation densely narrow, ovate-rounded and 

 minute at base : capsule small, ovate-cylindric, cernuous on a long pedicel smoothish 

 above. Trans. Amer. Phil. Soc. xiii. 13; Sulliv. & Lesq. 1. c. 2 ed. n. 512. 



Covering the sand among bushes near the shore, Sail Francisco, Bolander. 



8. H. pinnatifidum, Sulliv. & Lesq. Loosely cespitose, soft and pale green ; 

 stems slender, 3 inches long or more, prostrate, fragile, pinnately and densely 

 branched ; branches short or the upper flagelliforin : leaves densely imbricated, 

 lanceolate from an ovate subdecurrent base, subulate-acuminate, distinctly plicate, 

 margin revolute, subdenticulate at the apex, costa ceasing above the middle, areola- 

 tion linear-rhombic, quadrate at the auricles ; pericheetial leaves oblong, long-acumi- 

 nate, nerveless : capsule oblong, subcernuous, slightly curved, annulate ; operculum 

 mamillate : processes equalling the teeth, the ciliolse shorter. Muse. Am.-Bor. 

 Exsicc. 2 ed. n. 513. Camptothecium pinnatifidum, Sulliv. Icon. Suppl. 101, t. 77. 



On shaded rocks in canons, Bolander. 



H. MEGAPTILUM, Sulliv. in herb. Loosely cespitose, whitish or pale green ; stem stout, 6 

 inches high, erect, pinnately branched ; branches short, horizontal : leaves crowded, erect, nar- 

 rowly ovate-lanceolate, abruptly short-apiculate, concave, strongly plicate, costate to above the 

 middle, denticulate upon the subrevolute margin and upon the back along the costa and folds ; 

 areolation long-linear, shorter in the alre : capsule horizontal on a red pedicel, ovate-oblong, at 

 length arcuate ; operculum mamillate : ciliolse in pairs, appendiculate, equalling the indehiscent 

 processes and stout teeth. Camptothecium (?) megaptilum, Sulliv. Icon. Muse. Suppl. 102, t. 78. 

 On the ground in dense coniferous woods, Oregon, Hall. 



H. PSEUDOSERICEUM, Muell. (Flora, xxxiii. 89), appears to belong to this group : procumbent, 

 irregularly branched, flaccid and silky : capsule upon a very short pedicel, arcuate-cylindric, 

 slightly inclined ; operculum obliquely conic-rostellate : ciliolae solitary or in pairs. Portland, 

 Oregon, Nevius. 



H- ++ Pedicels smooth : branching pinnate. 



9. H. Nevadense, Lesq. Loosely cespitose, stout, yellowish green; stem 

 prostrate, pinnately branched, the branches short and horizontal or rather long, 

 irregularly divided and arcuate : leaves lanceolate, short-acuminate, secund-curved, 

 minutely serrate at the apex, carinate, deeply 2-plicate, margin revolute or reflexed, 

 the alar cells very few and irregularly oval : capsule ovate-cylindric, erect or sub- 

 cernuous ; operculum long-beaked ; annulus compound : ciliolae rudimentary or 

 wanting. Mem. Calif. Acad. i. 33. 



On rocks in the spray of Nevada and Bridal Veil Falls (Bolander) ; on sand and rocks in the 

 Washoe and West Humboldt Mountains, Nevada, and in the Wahsatch, Watson. 



-t Ramification irregular, rarely subpinnate : leaves decurrent, mostly sulcate ; 

 areolation narrowly hexagonal-rhombic, quadrate at the angles. BRACHY- 

 THECIUM. (Brachythecium, Schimp.) 



H- Pedicel smooth : monoecious, except n. 10. 



10. H. laetum, Bridel. Stems slender, 3 or 4 inches long, bright green, with 

 erect rather rigid branches : leaves ovate-lanceolate, shortly acuminate, more or less 

 striate, very minutely serrate above, areolation very long and very narrow : capsule 

 erect-cernuous, narrowly oblong-cylindric, subarcuate : operculum narrow-conic ; 

 annulus none : processes little shorter than the teeth, somewhat exceeding the 2 

 ciliolse. Sulliv. Icon. Muse. 185, t. 115. Rrachythecium loetum, Bruch & Schimp. 

 1. c., t. 554. 



Yosemite Valley, sterile (Bolander) ; Wahsatch Mountains ( Watson) ; common eastward, and 

 also European. 



11. H. collinum, Schleich. Stem densely radiculose, irregularly pinnate- 

 branched with short branchlets : leaves densely imbricated, ovate-lanceolate, short- 



