412 MUSCI. Hiipnum. 



7. H. arenarium, T.esq. Loosely and In-oadly ccspitose ; stciii spariiif^ly irreg- 

 ularly brancliL'd, tlu^ si;con(lary bramdu's short and oruct, or loiigi-r, filiform and 

 rooting: leaves crowded, ereet, lanceolate, aenniinate, the rellexed margin suh.serru- 

 late, costa ceasing below the apex, areolation (Uuisely narrow, ovate ronniled and 

 minute at base : capsule small, ovatc-cylindric, cernuons on a long ])edicel smoothish 

 above. — Trans. Amer. Phil. Soc. xiii. 13; SuUiv. i^ Lesip 1. c. 2 ed. n. 512. 



Covering tlie .s;tiiil aiiumg hiislics iiuar tlie shore, Sun Francisco, Bolandcr. 



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

 stems slender, 3 inelies long or more, i)rostrate, fragile, iiinnately and densely 

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

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

 margin revolute, subdenticulate at the ai)ex, costa ceasing above the middle, areola- 

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

 nate, nerveless: cajjsule oblong, subcernuous, slightly curved, annulate; oiicrcuhuu 

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

 Exsicc. 2 ed. n. 513. Camptotheclum pnnuitijidinu, Sulliv. Icon. Suppl. 101, t. 77. 



On shaded rocks in canons, Bolandcr. 



II. MEG.\i'TlLU.M, Sulliv. in lierb. Loosely cesiiitose, wliitisli or pale green ; stem stout, 6 

 inches high, ereet, i»innately branched ; branches siiort, liorizontal : U-aves crowded, erect, nar- 

 rowly ovate-lanceolate, abruptly sliort-ajtieulate, 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 alie : rajisule horizontal on a red jiudicel, ovate-oblong, at 

 length arcuate ; operculum nuimillate : ciliola; in i)airs, appcndiculate, eiiu.ilhng the indehiscent 

 l)rocesses and stout teeth. — ('uniji/otlicciniit (!) iiicijuptiliiin, Siilhv. Icon. Mii^c. Sujiiil. lu-2, t. 78. 

 On the ground in dense coniferous woods, Oregon, J/all. 



H. PSEiMiosEKicKf.M, Muell. (Flora, xxxiii. 81»), appears to brlong to this grouj) : procumbent, 

 irregularly branciuil, llaccid and silky: ca|i>.ule njion a vn y .-^inMt pedicel, arcuate-cyhnihic, 

 slightly inclined ; opercuhun oldicjucly conic-rostcllate : cili(d.e solitary or in pairs. — I'ortland, 

 Oregon, Kcvius. 



■H- ++ redlcels smooth : branchl/ir/ pinnate. 



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

 prostrate, pinnalely 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 rellexed, 

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

 cernuous ; operculum long-beaked; annulus compouiul : ciliuhe rudimentary or 

 wanting. — INIem. Calif. Acad. i. 33. 



On rocks in the sj)ray of Nevada and Hiidal Veil Falls {Bolandcr); on sand and rocks in the 

 Washoe and West Humboldt Mountains, Nevada, and in the Wahsatch, U'atsun. 



-1— -I— Ramification irregular, I'arehj suhplnnate : leaves decurrent, mostly sidcate ; 

 areolation narvonihj liexarjonal-rlioniblc, quadrate at the angles. — JJuaciiy- 

 THECIUM. (Brachi/fhecium, ISchimp.) 



++ Pedicel smooth : moncecious, except n. 10. 



10. H. Isetum, Bridel. Stems sleiuler, 3 or 4 inches long, bright green, Avitli 

 erect rather rigid branches : leaves ovate-lanccolatc, shortly acuminate, nmre or less 

 striate, very minutely .serrate above, areolation very long and very narrow : ca})sulo 

 erect-cernuous, narrowly oblojig-cylindric, subarcuate : ojierculnm narnnv-conic ; 

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

 ciliohw. — Sulliv. Icon. Muse. 183, t. 115. liraclnjlheciuni latum, Bruch & Schimp. 

 1. c, t. 554. 



Yosemite Vallej', simXa {Bolandcr) ; Wahsatch Mountains {jrafann) ; common eastward, and 

 also European. 



11. H. CoUinum, Schleich. Stem densely radiculose, irregularly pitmate- 

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



