402 ML'SCr. t'athuriuM. 



1. C. Callibryon, Elivh. Stems erect, usually simple, 1 or 2 inches lii{^li ; in- 

 novations from snhteiianean stolons : leaves elongated ligulate-lanceolate, the undula- 

 tions hispiil beneath and the narrow yellow horder spinulosc-serrate, the costa spinosc; 

 toward the ai)ex and bearing 2 to G narrow lanielhe : fertile llower terminal upon 

 the prolongation of the axis of a male llower, 1 - 3-fruited : capsule long-cylindric, 

 straight or arcuate, brownish red, the long-beaked operculum little shorter. — Heitr. 

 i. 189. Atriclium unJulatum, IJeauv. ; Bruch &. Schimp. Jiryol. Eur. t. -110 ; ^Vilson, 

 Eryol. Brit. t. 10; Berkeley, Brit. Moss. t. 19, lig. 4. Polylrichtim undulatton, 

 Hedw. Muse. Frond, i. 43, t. 16, 17; Engl. Bot. t. 1220. 



At Mission Dolores (Bolandcr) ; Port Discovery and Fort Nisqually, Wasliingtou Territory 

 {Fickeriivj) ; Fort I'ulville (Ltjall) ; in the Atlantic States and Europe. 



2. C. angustata, Brid. More slender than the last, with narrower more closely 

 areolate leaves serrate only at the a))ex, the lamella) more numerous : male and 

 female flowers in separate tufts : capsule narrower, more erect, pur|)le ; operculum 

 dark purple, Avitli a shorter beak. — Atrichum augustatum, Bruch & Schini)). 1. c, 

 t. 411 ; Sulliv. in Gray's Man. 2 ed. t. 3. Pu! //trichina angitstatum, Hook. Muse. 

 Exot. t. 50. 



On stream-banks, Santa Cruz Mountains (Brewer) ; connnon in tlie Atlantic States and in 

 Europe. 



40. OLIGOTRICHUM, DC. 



With the habit of Cathariiwa (to which it is nearly allied), but smaller and more 



rigid. Leaves linear-lanceolate, remotely serrulate, not bord<;red, the dilated c(jsta 



bearing numerous lamellae. Calyptra sparingly villous with erect hairs. Cajjsule 



erect, long-pedioelled, ovate-oblong, terete or nearly so ; oj)erculum convex-(;onic, 



acuminate or long-beaked. Peristome of Catharinea. 



About a dozen widely scattered species are known, of which one is jieculiar to Europe and two 

 to North America. This genus is united with Catharinea by Mueller, as a section ; both genera 

 were originally made upon the same species. 



1. O. Lyallii, Lindb. Stout, cespitose, yellowish brown; stems 2 inches high 

 or more, naked at base, fastigiately branched at the middle, very leafy above : leaves 

 spreading from a broad clasping base, covered above with lamelhe, the incurved 

 margin serrate from the middle to the apex ; inner perichietial leaves convolute- 

 ovate, shortly acuminate : calyptra fugacious : capsule oblong, somewhat contracted 

 above and biplicate, at length rugose ; operculum subulate-beaked. — Polytrich. 

 102 ; Sulliv. Icon. Infuse. Sup|)l. 56, t. 40. Polytrichadelphus Lyallii, Mitten, Journ. 

 Linn. Soc. viii. 49 ; Sulliv. k Lesq. !Musc. Am.-Bor. Exsicc. 2 ed. n. 322. 



On Mount Dana, in Yosemite Valley, and around Clear \AyVc {Bulandcr) ; Clover Mountains, 

 Nevada {Watson) ; Colorado (Hull) ; British Columbia, Luall. 



41. POGONATUM, Heauv. 

 Calyptra cucullate, covered by a dense coating of soft hairs attached to its apex 

 and nearly or cpiite covering the capsule. Otherwise as Oiiijotrichuin. 



Some 30 or 40 .species are referred to this genus, many of them Sonlli .\merican. Seven species 

 are found in North America, two of which are also European. 



1. P. alpinum, Bridcl. Loo.scly and irregidarly c('Si»itose ; stems much elon- 

 gated, decumbent at base, fastigiately i)ranche<l above : leaves linear-lanceolate, sheath- 

 ing, spreading and recurved or subsecund, dark dull green with whitish base, acutely 

 serrate, spinulnse on the back ; lanielhe with reddi.sh thickened margins: caj)S(de 

 usually cernuous, oval-oblong ; operculum small, with long oblique beak. — Bruch 

 & Schimp. Bryol. Eur. t. 418 ; Wil.son, Bryol. Brit. t. 11. Polytrich am (dpinum, 

 Linn.; Hedw. Spec. t. 19; Engl. Bot. t. 1905. 



