102 . BRYACE^. [Pottia. 



date by the excurrent yellowish costa, plano-concave, with 

 borders slightly recurved, green, chlorophyllose and verrucose 

 in the upper part, loosely areolate and hyaline toward the base : 

 antheridia paraphysate, axillary : calyptra tawny and scabrous 

 at the apex : lid obliquely rostrate from a convex base : j^eri- 

 stome composed of a basilar j^apillose membrane with an irregu- 

 lar margin sometimes cut into rudimentaiy teeth ; annulus 

 simple. — Bryol. Eur. t. 122. Gymnostomum Wilsoni, Hook. 

 Bot. Misc. i. 143, t. 41 ; Wils. Suppl. Engl. Bot. t. 2710. !>. 

 tru?icata, var. subcylindrica, James, Bot. King Exp. 399. 

 Hab. Meadows near Carson City, Nevada ( Watson). 



5. P. Heimii, Fuern. 1. c. Plants more robust, variable in 

 length, cespitose : leaves open, flexuous, the lower distant, 

 broadly lanceolate, the upper longer, close and tufted, lanceo- 

 late-acuminate, serrulate at the ajjex ; costa subpercurrent : 

 flowers synoecious or in separate terminal buds : calyptra large, 

 smooth : capsule obovate or oblong, truncate, solid, brown ; 

 lid obliquely rostrate from a plano-convex base, attached to the 

 exserted columella and deciduous with it. — Bryol. Eur. 1. 124 ; 

 Muell. Syn. i. 551. Gymnostomum Heimii, Hedw. Muse. Frond, 

 i. 80, t. 30. 



Hab. Ditches near Soda Springs, on tlie Upper Tuolumne, California 

 (Bolander) ; mountains of Utah and Nevada ( Watson) ; Colorado and the 

 Rocky Mountains of British America ; not rare. 



6. P. riparia, Aust. Plants short, widely cespitose, dirty 



green : leaves narrowed to the half-clasping base, sub- 



spatulate, rounded or lanceolate with a short acumen, more or 



less distinctly denticulate, plane on the borders ; costa stout, 



vanishing below the apex: flowers dioecious (?) (male plants 



unknown) : capsule comparatively long and narrow, cylindric- 



oblong, erect or slightly cernuous ; lid conical, raamillate ; 



columella long, emerging, attached to the lid ; anmilus large, 



compound. — Muse. Aj^pal. n. 112; SulUv. Icon. Muse. Suppl. 



34, t. 21. 



Hab. On moist rocks along streams ; Palisades of Southern New York 

 and New Jersey, rarely fertile (Austin). 



7. P. Barbula, Muell. Plants stemless, budding, gregari- 

 ous or Rubcespitose, simple : leaves few, close together, slightly 

 twisted, oblong-lanceolate, the lower acuminate, tlie upper 

 blunt at the slightly crenulate apex : flowers dicecious, termi- 



