Hypnum. MUSCI. 419 



areolation, serrulate especially below and remotely denticulate above, the capsule 

 without annulus. It differs from H. Jiuitans in its firmer narrower less crowded 

 more falcate and more narrowly areolate leaves, more distinctly auricled at base, and 

 the larger peristome with a broader basal membrane. Bryol. Eur. t. 602. 



Var. cochleae, Austin. Stem strict, rigid : leaves erect, variegated with purple, 

 usually entire above and spirally twisted when dry, distinctly serrate at the slightly 

 narrowed base. Coult. Bot. Gazette, ii. 143. Uichelyma Swartzii, Lesq. in Mem. 

 Calif. Acad. i. 28 ; Sulliv. & Lesq. 1. c. 2 ed. n. 344. 



In upland swamps, Tulare County (Brewer) ; in pools on Mount Dana and swamps near Men- 

 docino City, Bolunder. A European species, forms of which are also found in the Atlantic States. 



37. H. commutatum, Hedw. Stem procumbent or suberect, pinnately 

 branched, 4 to 12 inches long or more, brownish tomentose; branches slender, - 

 inch long : leaves falcate-secund, twisted when dry, ovate-lanceolate from a broad 

 base, narrowly acuminate, sulcate, the upper auricle flat and erose-denticulate, the 

 lower decurrent and entire, the stout costa reaching to the apex, areolation long- 

 linear, subflexuous, hexagonal-quadrate at the angles : capsule oblong-cylindrical, 

 cernuous and arcuate ; annulus broad ; operculum acute : ciliolse 3, long. Muse. 

 Frond, iv. 68, t. 26 ; Bruch & Schimp. 1. c., t. 607 ; Berkeley, 1. c., t. 10, fig. 5. 



On the east side of Mono Pass (Bolander) ; Europe. 



H. FILICINUM, Linn. More slender than the last and less regularly pinnate, the much smaller 

 firmer and more stoutly costate leaves not twisted when dry and the areolation much shorter : 

 tomentunv more dense : annulus simple. Hedw. Spec. t. 76 ; Engl. Bot. t. 1570 ; Bruch & 

 Schimp. 1. c., t. 609. Washington Territory (Lyall) ; llocky Mountains from British America 

 to Utah and Colorado ; Atlantic States and Europe. 



H- *- Monoecious. 



38. H. uncinatum, Hedw. Stem erect or prostrate, remotely pinnate-branched, 

 slender, about -2 inches long ; branchlets falcate : leaves crowded, yellowish green 

 and glossy, strongly falcate-secund, very long and narrow and subsetaceous from a 

 broad base, distinctly plicate-striate, serrulate, costate to near the apex ; areolation 

 very narrow, looser at base and more broadly rectangular at the angles ; perichsetial 

 leaves very long and hair-pointed, erect, striate : capsule oblong-cylindric, cernuous, 

 incurved : ciliolse 2, nearly equalling the processes. Muse. Frond, iv. 65, t. 25 ; 

 Bruch & Schimp. 1. c., t. 600; Berkeley, 1. c., t. 11, fig. 1. 



Frequent in the Sierra Nevada, and throughout North America from arctic regions to Utah, 

 Colorado and the Atlantic States ; also Europe and Asia. 



H. FLUITANS, Linn. Stems pinnate, erect or floating, in swamps or stagnant waters, J to 1 

 foot long or more ; leaves loosely imbricated, Haccid and often not fuloate-secund, long-lanceolate 

 and acuminate, nearly entire, costate to above the middle : annulus none : ciliola; often imperfect 

 or united. Hedw. Muse. Frond, iv. 94, t. 36 ; Eng. Bot. t. 1448 ; Bruch & Schimp. 1. c., t. 602. 

 Oregon (Hall) ; Uinta Mountains ( Watson) ; from Arctic America to the Atlantic States, and in 

 Europe and South America. 



* * Stem more or less regularly pinnate : leaves crowded and falcate-secund in 

 one or two ranks, shortly bicostate or nerveless: areolation narroivly linear, 

 quadrate at the anyles. DHEPANIUM. 



39. "EL. fertile, Sendt. In soft depressed subcircular bright green and yellowish 

 tufts, densely piunately branched : leaves somewhat 2-ranked, narrowly lanceolate 

 and attenuate to a hair-like apex, strongly incurved, subcircinate when dry, minutely 

 serrulate at the apex, the lower margin rettexed, very obscurely bicostate at base : 

 flowers monoecious : capsule oval or oblong, cernuous, subarcuate, brownish above, 

 paler below, with broad annulus and large convex-apiculate operculum. Bruch & 

 Schimp. 1. c., t. 591. 



On rocks in the Calaveras Grove (Bolander) ; Europe. 



40. H. subimponens, Lesq. Stems procumbent, sparingly branched, slender, 

 the branches closely plumose-pinnate : leaves strongly falcate-secund, ovate- to oblong- 



