— 72— 



Pinnate or bipinnate: stem leaves spreading-recurved when moist 

 (Fig. 6), costa subpercurrent; perichaetical bracts not ciliate rccogniium. 



Bipinnate or tripinnate; stem leaves erect-spreading when moist 

 (Fig. 7), costate to 4-5 ; perichaetical bracts ciliate de licatnltnn. 



Bipinnate; stem leaves with a hyaline filiform acumination; perichaetial 

 bracts scarcely ciliate Philibe-rti. 



B. 



Stem leaves (Fig. 8) roundish ovate, abruptly 

 linear-oblong acuminate, margins erose-serrate. 



I '^irg in ianmn. 



Stem leaves broadly ovate, long and nar- 

 rowly acuminate, margins crenulate-serrulate 

 or entire (Fig. 9) microphyllnm. 



Fig. 8. 



Fig. 9. 



Fig. II. 



Fig. 12. 



C. 



Stem leaves plicate-striate, the decur- 

 rent base with one to three cilia (Fig. 11); 

 branch leaves loosely appressed when 

 dry paludosiiui. 



Stem leaves sulcate, contracted to a 

 decurrent subclasping paraphyllose base 

 (Fig. 12); branch leaves subcrispate when 

 dry Blandowii. 



THUiDiu>f I'VGM.^L'M Br. & Sch. For fineness and for beauty this little 

 moss, appearing when dry like miniature embroidery, leads the Thuidiums. 

 The paraphyllia, found only on the branches, are so small as easily to be over- 

 looked. The median leaf cells of the triangular-ovate stem leaves are quad- 

 rate-hexagonal and the operculum of the asymmetric oblong-ovate capsule 

 obliquely rostrate ; monoicous; spores maturing in autumn. Canada, Ohio, 

 New Jersey, and Pennsylvania. 



Thuidium .minuttlum (Hedw.) Br. & Sch. Although quite small this 

 species differs from the preceding chiefly in being larger. Paraphyllia on 

 both stems and branches ; median leaf cells quadrate-he.\agonal, the marginal 

 somewhat larger; monoicous; capule oblong-oval, rough, slenderly rostrate. 



Its usual habitat, in the northern part of its range, is rotten wood; in its 

 southern, the ground. The spores mature in autumn. Fr<jm New Bruns- 

 wick to Minnesota and from Canada to Florida. 



Thuidium scitum (Beauv.) Aust. This neat trim moss grows in mats 

 on the roots and bases of trees. Stem leaves broadly triangular, auriculo- 



