ITypnum.] BRYACE^. 387 



Var. gracilescens, Brid. Very slender, prostrate or 

 creeping, very tomentose : leaves spreading or siibsecund, very 

 small, bright green. — Bryol. Univ. ii. 531. 



Var. elatum, Schimp. Plants in soft yellowish brown 

 tufts; stems 10 to 15 cm. long, slender, with few radicles and 

 parapbyllia: leaves minute, ovate-lanceolate, spreading or sub- 

 secund. 



Var. Floridanum, Renault. Leaves nearly entire ; costa 

 narrower, vanishing in the middle, often scarcely distinct ; 

 radicles and paraphyllia rare; cells of the basilar angles thick- 

 M^alled. 



Hah. Calcareous springs; not rare in limestone regions. The last 

 variety in Florida {Fitzgerald). 



Very variable, especially in the size and thickness of the plants. It 

 differs from the next in its more slender habit, the leaves much smaller, 

 more solid, not plicate, and with a thicker costa, the areolation shorter, 

 the annulus of a simple row of cells, etc. 



14o. H. COmmutatum, Hedw. Tufts deep, rigid, bright 

 or yellowish green at the surface, brown and generally covered 

 M'ith a calcareous deposit within ; stems dichotomous-cristate 

 and ])innately ramulose, very long, erect or prostrate : stem- 

 leaves more distant, deeply cordate, auriculate triangular at 

 base, narrowly lanceolate-acuminate, plicate ; upper auricles 

 flat, denticulate, the lower excavate, entire, orange-colored; 

 costa stout, subj)ercurrent ; branch-leaves narrower, more 

 crowded, all twisted at the apex when dry; areolation very 

 narrow, long-linear, subflexuous ; inner perichastial leaves long, 

 narrowly acuminate, deeply plicate and strongly costate : cap- 

 sule curved horizontally, cylindrical-oblong ; operculum convex- 

 conical, acuminate or apiculate ; teeth large, orange ; annulus 

 large, compound. — Muse. Frond, iv. 68, t. 24; Bryol. Eur. t. 

 607. Stereodon commutatus, Mitt. 



Var. falcatum, Muell. Stems stouter, neither tomentose- 

 radicnlose nor pinnately ramnlose : leaves larger, more solid, 

 ovate-oblong, less deeply cordate and less decurrent at base; 

 areolation longer and narrower; costa more prolonged; peri- 

 stome small and the annulus narrower. — Syn. ii. 423. II. fal- 

 catum, Brid. Muse. Kecent. iii. 63, t. 1, fig. 6 ; Schimp. Syn. 

 ed. 2, 743. 



Hab. Wet rocks, Watkins Glen, N. York; Rocky Mountains, S. Colo- 

 rado {Rothrock)\ Mono Pass {Bolander)\ the variety in Colorado. 



