384 BRYACE^. [ny2}num. 



Var. falcatum, Brucli & SchimiD. 1. c. More robust and 

 more densely ramulose : leaves larger, more crowded, falcate- 

 secund, solid, yellowish when young, brown when old. 



Var. Jamesii. Branches long, regularly pinnately ramu- 

 lose : leaves long, very narrow ; costa stout, nearly percurrent. 



Hab. Ditches, open deep swamps, and peat-bogs; common. The last 

 variety in the Wliite Mountains (James). 



137. H. exannulatum, Guembel. Stems erect or droop- 

 ing, varying in length ; branches and branchlets circinnate by 

 the incurving of the leaves : leaves crowded, uncinate-secund, 

 the upper falcate, long-lanceolate, narrowly acuminate, concave, 

 not sulcate, minutely serrate below, nearly entire above, nar- 

 rowly costate to near the apex, glossy ; areolation vermicular, 

 very narrow, larger and longer at base than in the middle ; cells 

 of the auriculate angles large and inflated, hyaline: capsule 

 long-pedicellate, erect-incurved, cylindrical-oblong; operculum 

 convex-conical, apiculate ; peristome perfect ; segments and 

 cilia (three) as long as the teeth; annulus none. — Bryol. Eur. 

 t. 603. Aynblystegium exannulatum, DeNot. 1. c. 142. 



Hab. Marshy places; Catskill Mountains (C. H. Peck); rare. 



Differs from II. fluitans in the more solid narrower and more falcate 

 leaves, distinctly auriculate at base, the narrower areolation, and the di- 

 oecious inflorescence. 



138. H. revolvens, Swartz. Monoecious: tufts soft, red- 

 dish brown or nearly black ; stems slender, erect-flexuous, 

 branching, fastigiately ramulose : leaves twisted or circinnate- 

 falcate, long sublinear-lanceolato, long filiform-acuminate, costate 

 to above the middle or at the base only on the l)rnnchlets ; areo- 

 lation very narrow, vermicular, w^ith a few elongated hyaline 

 basilar cells; outer perichretial leaves erect, abruptly filiform- 

 acuminate from a short ovate base, ecostate, the inner long, 

 gradually long-acuminate, sulcate and narrowly costate to the 

 base of the point : capsule erect at the distinctly necked base, 

 cernuous, oblong-oval, scarcely c(mstrictcd under the orifice 

 when dry ; operculum convex-conical, ajiiculate ; cilia two, 

 shorter than the slightly cleft segments ; annulus large, of a 

 triple row of cells. — Muse. Suec. 38, t. 7, fig. 14; Bryol. Eur. 

 t. 601. Ambhjstegium revolvens, DeNot. 1. c. 140. 



Var. intermedium. Leaves more densely crowded, cir- 

 cinnate, shorter, Avith a shorter spirally incurved point; areo- 

 lation shorter and broader. 



