24 



SMITHSONIAN MISCFXLANEOUS COLLECTIONS VOL. 85 



integerrimis, toto ambitu revolutis, 1.5 mm. longa, 0.6-0.7 mm. lata; 

 rete opaco, dense et minute papilloso ; cellulis quadrato-hexagonis, 

 chlorophyllosis, baud incrassatis, diam. 6 fi, basilaribus paucis, hyabnis, 

 laevibus, breviter rectangularibus, costa basi 60 ju,, dorso minute pa- 



FiG. 14. — Tortilla ripicola Ther. i, 2, 3, leaves; 4, 5, acumens; 6, median leaf 

 cells; 7, basal cells; 8, 9, 10, 11, cross-sections of a leaf; 12, propagulae. 



pillosa, in mucronem brevem excedente, structura in sectione trans- 

 versab ut in genere. 



Group of T. papulosa Wils. Well cbaracterized by its small size, its 

 leaves broadened at base, revolute all around and short-mucronate, 

 and its very compact areolation. 



TORTULA FRAGILIS (Tayl.) Mitt. Muse. Austr. Amer. 172. 1869 



Torlula confusa Card. Rev. Bryol. 36: 87. 1909. 

 Tortula Pringlci Card. Rev. Bryol. 36: 87. 1909. 



Puebla: (4510); Esperanza (4940). Distr. Federal: Tlalpam 



(9494)- 



For tbe synonymy of tbis species tbe reader is referred to a recent 

 note by Mr. E. B. Bartram.' While studying Bro. Arsene's collection 

 I also formed a clear idea tbat Cardot's two species could not be main- 

 tained, as tbe author himself apparently suspected. 



TORTULA OBTUSISSIMA (C. M.) Mitt. Muse. Austr. Amer. 174. 1869 



Puebla: Cerro Guadalupe (667, 673). Tlaxcala: (606). Valle de 

 Mexico {Bro. Amable) : San Juanico (1232); Tenayuca (1376); 

 Xoquiapan (1675). 



' Bryologist 29: 53. 1926. 



