l6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 85 



baud vaginata ; pedicellus purpureas, erectus, 10-12 mm. longus ; cap- 

 sula oblonga (2 mm. longa c. operculo), annulata, peristomii dentes 

 e membrana basilar! bumiUima erecti (0.6 mm. alti), fere usque ad 

 basin in 2 crura fibformia papillosa divisi ; sporae laeves, 12-15 ju,; 

 operculum conico-rostratum. 



Distinguisbed at a glance from D. ocncus by its small size. The leaf 

 margin is so closely revolute that at first sight the border seems to be 

 thickened and formed of two layers of cells. 



DIDYMODON OENEUS (C. M.) Schimp. in Besch. Prodr. Bryol. Mex, 28. 1871 

 Trichostomum Ocncuni C. M. Syii. 2: 628. 1851. 



Puebla: Esperanza (4802). Valle de Mexico: Desierto {Bro. 

 Amablc 1205 p. p., 1417). 



DIDYMODON CAMPYLOCARPUS (C. M.) Broth, in E. & P. Nat. Pflanzenfam. 



i'': 405. 1902 



Trichostomum campylocarpnvi C. M. Syn. 2: 628. 1851. 



Valle de Mexico: Desierto {Bro. Amahle 1248). 



DIDYMODON INCRASSATO-LIMBATUS Card. Rev. Bryol. 36: 81. 1909 



Morelia: (7914); Rincon (4567); Loma Santa Maria (4886); 

 Cerro San Miguel (5085). Valle de Mexico: Tlalpan {Bro. Amahle 



1348, 1349)- 



According to these specimens the peristome teeth are a little twisted, 

 and not exactly straight. Furthermore, the cells of the operculum are 

 arranged in oblique rows, a character which is also found in Pringle's 

 no. 10588. No. 4567, from Rincon, is a form with acute leaves whose 

 margins are less strongly thickened. 



DIDYMODON FUSCO-VIRIDIS Card. Rev. Bryol. 36: 83. 1909 

 Valle de Mexico: San Juanico {Bro. Amablc 1264). 



DIDYMODON PUSILLUS Card. Rev. Bryol. 36: 82. 1909 



Valle de Mexico {Bro. Amablc) : Desierto (1207 p. p., 1331, 

 1 61 5) ; Rio Frio (1746) ; Xoquiapan (1752). 



A robust form, the stems tall, up to 2 cm., leaves wider at the base, 

 margins plane or slightly reflexed. These plants seem to mark a 

 transition toward the last preceding species. 



DIDYMODON DIAPHANOBASIS Card. Rev. Bryol. 37: 125. 1910 



Valle de Mexico {Bro. Amablc): Contadero (1363); Rio Frio 

 ('704). 



