FEB. 1908.1 OKAMURA.—NEW GENERA OF MUSCL 31 



smooth, green when young becoming yellowish-green when 

 mature; exothecal cells round-hexagonal or elliptical-hexagonal 

 0.084-0.112 mm. long, 0.042-0.060 mm. wide ; stomata not dis- 

 tinct and many on the neck ; annulus not observed ; columella 

 well developed, 2.5 mm. high. Peristome double, 16 teeth in each 

 row ; external-peristomal teeth lineal-lanceolate, 0.85 mm. 

 long, 0.13 mm. wide at the base, obscure fuscous, not limbate, 

 with many small papillae and flexuose middle line ; lamella 

 high, dentate and 0,035 mm. prominent on notatus ; inner 

 peristome vellowish-fuscous, with many minute papillae, 0,8 mm. 

 long, teeth 0.3 mm long, 0.085 mm. wide at the base, middle 

 line carinate, hiatus hardly visible ; basal membrane very high, 

 attaining about 0,5 mm, high, plicate ; cillia 2, very short' 

 0.08 mm. long, 0.02 mm. wide, linear, without appendix. 

 Operculum conical, 1.3 mm. long, 1.2 mm. in diameter ; rost- 

 rum long, 0.5 mm. long, slightly curved. Spore green, with 

 minute papillae, 0.060-0.075 mm. in diameter ; maturing in 

 August. Calyptra cucullate, yellowish-green, smooth, long 

 subulate-acuminate, 9. mm. long ; cells narrow-rectangular. 



Type locality, Prov. Tosa : Takakawa in Mt. Kuishi. 

 (Coll. S. Okamura, Aug. 30, 1905 ; E. Uyematsu and S. 

 Okamura, Apr. 2, 1906 ; vS. Okamura, Dec. 26, 1906, and Mar. 

 31, 1907 ; G. MatsuCxI and vS. Okamura, May 5, 1907 ; S. 

 Endo, G. Matsugi and S. Okamura, Oct. 26, 1907.) 



{to be continued.) 



