626 MUSCI. (MOSSES.) 



TRIBE VII. TRICHOST^ME^E. 



19. TRICIIOSTOIttUUI, Br. & Sch. (Tub. 15.) 



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

 cal, mostly erect, long-pedicellate. 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 dichotomonsly divided ; leaves 

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

 areolation loose below, dense and roundish above. (Name from Gplt;, a hair, 

 and ord/ia, a mouth, in allusion to the capillary teeth of the peristome.) 



1 T. ttirtilc, Sclirad. Stems mostly simple, 3" -5" high ; leaves lance- 

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

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

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



2. T. tcnilC, 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 Hedwig. (Eu.) 



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

 erect, appressed, ovate-lanceolate; the perichaetial 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 to 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. pfillitUiiS!, 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 (l'-2' high) straw-colored pedicels; monoecious; male flower 

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



5. X. glaiicescons, 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. RARBULA, 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 

 peris tome.) 



