4 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 85 



appears as a thin opaque slice, in which is seen only the median arc 

 of eurocysts covered on both sides by cells with a small lumen. 



But, using a higher magnification for the same section, one notices 

 that the ventral surface is formed of a unique layer of cells with 

 very thick walls showing a lumen like a " cat-eye " (not punctiform). 

 These cells, which are not stereids, remind one exactly of those found 

 in C. matarensis Besch., from La Reunion Island. Like the last named 

 species, C. Saint-Pierrci belongs to the group " C.b." ' 



Another peculiarity is that the comal leaves often end in a rather 

 long hair point, which is discolored or subhyaline, recalling to mind 

 that of the group Trichophylli. 



POTITACEAE 

 MOLENDOA OBTUSIFOLIA Broth. & Par. in Card. Rev. Bryol. 40: 36. 1913 



Puebla: Hacienda Alamos (4631, 4697); Rio Alseseca (574). 

 \"era Cruz ; Cordoba (10978). Distr. Federal: Mixcoac (9432,9434, 

 9462, 9465, 9466, 9468). Valle de Mexico {Bro. Amable) : Desierto 

 (1244) ; San Juanico (1261). 



The leaves of this species show a peculiarity which has not yet 

 been pointed out : the margins of the acumen are a little thickened 

 by the bistratose marginal cells, such as may be seen in some other 

 species of the family Pottiaceae. 



MOLENDOA OBTUSIFOLIA Broth. & Par. var. INCRASSATA Ther., var. nov. 



Puebla: Hacienda Batan (5007 p. p.), associated with Trichosto- 

 mopsis crispifolia Card. 



Caulis I cm. altus. Folia breviora latioraque, i mm. x 0.25 mm. ; 

 rete opaco, cellulis incrassatis, costa 50 /x. 



Here the thickening of the cell w^alls is more accentuated than 

 in the type form : toward the apex the lamina is composed of 2 layers 

 of cells throughout, while in the middle the thickening is confined 

 to 2 or 3 rows of marginal cells. 



ANOECTANGIUM LIEBMANNI Schimp. in Besch. Prodr. Bryol. Mex. 15. 1871 

 Morelia: Jesus del Monte (7965). 



ANOECTANGIUM COMPACTUM Schwaegr. Suppl. i: 36, pi. 11. 1811 

 Puebla: (4800). 



'E. & P. Nat. Pflanzenfam. cd. 2, 10: 187. 1924. 



