626 musci. (mosses.) 



Tsibe VII. TRICHOSTOME^. 



19. TBICIIOSTOnUIII, Br. & Sch. (Tab. 15.) 



Calyptra cuculliform. Operculum conic-rostrate. Capsule oval or cylindri- 

 cal, mostly erect, long-pedieellate. Peristome single: teeth 32, linear, approxi- 

 mate in pairs. Inflorescence various. — Plants growing on the ground or on 

 Stones, of a rather rigid habit; stems simple or dichotomously divided ; leaves 

 varying from lanceolate to lanceolate-subulate, costate to or beyond the apex ; 

 areolation loose below, dense and roundish above. (Name from 6pi£, a hair, 

 and -jrofxa, a mouth, in allusion to the capillary teeth of the peristome.) 



1 T. t6s*isie, Schrad. Stems mostly simple, 3" -5" high ; leaves lance- 

 olate-subulate, spreading, often subsecund, reflexed on the margin ; costa excur- 

 rent; capsule cylindrical ; operculum shortly rostrate; annulus simple: dioecious; 

 male flower terminal. — Road-sides, clay-banks : frequent. (Tab. 15.) (Eu.) 



2. TT. teniae, Hedw. Distinguished from small forms of the last, which 

 it much resembles, mainly by its large double annulus, firmer and brownish-red 

 capsule, and the plane (not reflexed) margin of the leaf. — Pennsylvania, accord- 

 ing to Hedicvj. (Eu.) 



3. T. Vaginalis, Sulliv. Stems 6"- 10" high, slender; stem-leaves 

 erect, appressed, ovate-lanceolate ; the perichsetial leaves sheathing, suddenly 

 attenuated, spreading at the apex, the costa strong and excurrent ; capsule 

 oval-oblong ; teeth of the peristome short, anastomosing in pairs ; annulus 

 double, very large, its width equal tp half the length of the teeth; pedicel slen- 

 der, flexuous ; operculum elongated-conic, obtuse ; inflorescence as in No. 1 . — 

 Sides of ditches and roads, Pennsylvania and New England. 



4. T. pfsB3B4BassB8, Hedw. Stems short, 3" -4" high; leaves long-seta- 

 ceous from a lanceolate base ; costa broad, excurrent, denticulate at the apex ; 

 capsule oblong-elliptic. — Clayey grounds; frequent. — Conspicuous by its nu- 

 merous, long (U'-2' high) straw-colored pedicels; monoecious; male flower 

 gemmiform, in the axils of the upper leaves. (Eu.) 



5. T. gJa««esccns, Hedw. Stems densely csespitose, 6"- 10" high, 

 fastigiately branched ; lower leaves small, remote, lanceolate ; the upper larger, 

 and crowded into a terminal tuft, linear-lanceolate, costate to the apex, the plane 

 margins denticulate above; capsule oval-oblong; operculum elongated-conic. 

 Shores of Lake Superior, Agassiz. — Remarkable for the glaucous hue of its 

 foliage. (Eu.) 



20. iAESULA, Hedw. (Tab. 15.) 



Calyptra cuculliform. Operculum subulate-conic. Capsule oval-oblong or 

 cylindrical, long-pedicellate. Peristome single : teeth 32, very long, filiform, 

 contorted, connected at the base by a short or long tubular membrane. Inflo- 

 rescence various. — In habit, ramification, texture, and mostly in the form of the 

 leaves, allied closely to Trichostomum : differing chiefly in the torsion of the 

 peristome. (Name a diminutive of barba, beard, in allusion to the capillary 

 peristome.) 



