Didijmodon. MUSCI. ogc 



cells souunvlKit sinuous, those at the anodes lar^^.r and quadrate : capsule cylindrical 

 so.neu-l.a araiate lirn, M-ithout ann..Ius, l.rou-nish u,H.n a r.-ddish pedicel; oper- 

 culum with a stout red beak as long as ti.e capsule : teeth ,lark puJple. - Muse. 

 Inond^i, t 8; rueh & Schnnp. 1. c, t. 71. 75; Sulliv. i,i Gray's Man. 2 ed. G22, 

 t. 2 ; Berkeley, Bnt. Moss. t. 23, iig. 7. ' 



Collectt'd in ihvgon (Pickering), and also in CaHfornia {Dolander), a form with the leaves 

 scarcely denticulate. A very variable species, very common eastward and in Europe 



8. D. palustre, LaPyl. Loosely cespitose ; stems 3 or 4 iiiches long, slender, 

 tomentose to he summit : leaves spreading, very shining, lineardanceolate, trans- 

 versely undulate above, serrate toward the apex upon the margin and back, with 

 slender casta vanishing below the ape.x : capsule oval-oblong upon a slender llexuous 

 pedicel slightly incurved, distinctly striate; annulus none : teeth as in the last.— 

 iirucii (fc Schimp. 1. c., t. 79 ; Wilson, 1. c, t. 18. 



Var. Stems shorter: leaves narrower, scarcely undulate, falcate-secund : capsule 

 longer, more slender, and more incurved. — Lescp Mem. Calii'. Acad. i. 7. 



Eureka, Humholdt County (^o/a«r^.r) ; Washington Territory (^ya«, iroo.i)- the varietv at 

 iiioriaein unio ana in LJntish America, growing in maishes. 



10. CERATODON, Biidel. 

 Slender densely cespitose perennials, ou the ground, or rarely on rocks, fastigiately 

 branched. Leaves several-ranked, lanceolate, strongly costate, flexuose or rarely 

 strict when dry, dull, papillose or sraoothish abo^^e, entire; areolatiou minutely 

 quadrate, near the base looser, more hexagonal and hyaline. Inflorescence dioecious, 

 terminal: male flowers bud-like. Calyptra cucullate. Capsule slightly nodding,' 

 oblong-cylindric, long-pedicellate, striate, deeply sulcate when dry, with broad 

 annulus; operculum conic, subrostrato. Peristome single, of 16 regular linear- 

 lanceolato teeth, equally cleft nearly to the base, papillose and prominmitly articu- 

 lated, strongly liygroscoi)ic. 



Three species are European, one of tliem cosmopolitan. 



1. C. purpureus, Bridel. Tufts soft, reddish- to olive-green, 2 or 3 inches 

 high or less: leaves oblong-lanceolate, carinate, with recurved margins and excur- 

 reut costa, dull and smoothish : capsule purplish red and shining, upon a purple 

 pedicel, incurved and 4 - 5-angled when dry: teeth purple, when dry spirally in- 

 curved -- Bruch & Schimp. Bryol. Eur. t. 189, 190; Sulliv. in Gray's Manual, 

 ^ed. t 1 ; bulliv. & Lesq. Muse. Am.-Bor. Exsicc. n. 107" (2 ed. n. 160) ; Berkeley 

 ijrit. Moss, t 23, fig. 5. Dicranum purpuream, Iledw. Spec. 3G, t. 36. Dufumodon 

 ]ntrpureus, IIo„k. ct Tayl. Muse. Brit. G5, t. 20. 



Var. xanthopus, Sulliv. & Lesqx. 1. c. Pedicels white. 



or^Z^Z^\!^ufi^"ul^^'-''"\f '''''"' ^'''''"'''''•); °" ^vet rocks, Yosemite Valley (Bo/ander); 

 of l,oH. T}f rl"' "'•* ^r,"^ Mountains, Nevada ( JFafson) ; the variety on roots and stumps 

 nn ? t TV , fT'?' ^' ""!'''•■ The most common and cosmopolitan 'of all mosses, growing 

 fiom the sea-level to high altitudes in the mountains, and from arctic regions to the t.opi?s. ^ 



11. DIDYMODON, Hedw. 

 ^ Branching cespitose perennials, rooting at the base of the branches. Leaves 

 linear-lanceolate, serrate and densely papillose at the apex, the areolation looser and 



