Hypnum.] BRYACEiE. 347 



[ part only, smooth and yellow below ; lid large, conical, mamil- 

 late. — Trans. Amer. Phil. Soc. xiii. 13. 



; IlAB. On rocks and dry sand, near the bay of San Francisco {Bo- 



' lander). 



Gl. H. illecebrum, Schwaegr. In more or less dense 

 yellowish or dirty green tufts; stems irregularly branching, 

 subi^innately ramulose ; branchlets short, arcuate, turgid and 

 obtuse at the apex : leaves erect-spreading when moist, imbri- 

 cate when dry, ovate, with a short recurved acute point, very 

 concave, minutely serrate at the apex, shining ; costa ascending 

 to above the middle, rarely forked : capsule horizontal, turgid, 

 ovate, brown, often of two colors ; pedicel thick, very rough ; 

 operculum convex-conical, apiculate. — Spec. Muse. ii. 225. 

 jSclero2?odmm illecebrum^ Bruch & Schimp. Bryol. Eur. t. 557. 



Hab. Shady sandy ground, San Francisco, CaUforuia {Bolander, 

 Glhbons); Alaslca {Kellogg). 

 Very variable; secondary stems sometimes dendroid. 



Subgenus X. ISOTHECIUM. 



Primary stems creeping, the secondary erect, more or less 

 dendroid; branches close, fasciculate, curved on one side, or 

 flagellate and stoloniferous. Leaves small, close, open or im- 

 bricate when dry, ovate-oblong, acute or acuminate, rarely 

 smooth, more or less distinctly papillose on the back, costate to 

 the middle or above ; areolation minute, vermicular-oblong, the 

 basilar.short-angular or ovate. Inflorescence dioecious. Capsule 

 regular, suberect, oval-oblong. Operculum short-rostrate. Pedi- 

 cel smooth, except in the last si:)ecies. — Isothecium, Brid. 



The type of this subgenus is II. myosiiroidefi, placed by Schimper in 

 Eurhynckium. Some of the American species described here have a 

 marked resemblance to that moss, differing essentially in the areolation 

 being slightly papillose. 



62. H. myosuroides, Linn. Tufts soft, pale green; 

 pi-imary stems slender, long-creeping and radiculose, with small 

 leaves; secondary stems erect, branching and tree-like, very 

 ramulose, flagelliform ; branches and branchlets inclined to the 

 same side : leaves of the secondary stem spreading, cordate- 

 lanceolate and narrowly acuminate, the rameal gradually nar- 

 rower and oblong-lanceolate to lanceolate, those upon the 



