2)6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 85 



BRACHYTHECIUM SERICEOLUM Card. Rev. Bryol. 37: 66. 1910 

 Puebla: (4997) ; Hacienda Batan (4975). 



BRACHYTHECIUM FLEXINERVE Card. Rev. Bryol. 37: 67. igio 



Puebla: (4862); Hacienda Santa Barbara (740). Tlaxcala: 

 (4855)- 



BRACHYTHECIUM ALBO-FLAVENS Card. Rev. Bryol. 37: 68. 1910 



Puebla: Rancho Guadalupe (4614) ; Esperanza (4666). Morelia: 

 Campanario (7537, 7566) ; Cerro Azul (4530). 



BRACHYTHECIUM ALBO-VIRIDE Besch. in Card. Rev. Bryol. 37: 69. 1910 



Puebla: Boca del Monte (4674). Morelia: Campanario (7539). 



I recognize in these specimens most of the characters attributed 

 to B. albo-viride : the green color of the tufts, the laxly foliate 

 branches, the lanceolate leaves strongly excavate at the base, long- 

 acuminate, w^ith a costa reaching to two-thirds and even three-fourths 

 of the leaf ; but I have not noticed that the stems are more slender and 

 the branches more tenuous than in B. albo-flavens. 



BRACHYTHECIUM LAXIRETICULATUM Card. Rev. Bryol. 37: 67. 1910 

 Valle de Mexico: Desierto {Bro. Amahle 1412). 



BRACHYTHECIUM ACUTUM (Mitt.) SuU. Icon. Muse. Suppl. 99. />/. 75. 1874 

 Pueblo: Rio San Francisco (5001 p. p.) ; sterile plant. 



BRACHYTHECIUM SALEBROSUM (Hoffm.) Bry. Eur. 

 Puebla: Esperanza (4515, 4664, 4690). 



BRACHYTHECIUM SALEBROSUM var. POLYOICUM Ther., var. nov. 



Synoicous and unisexual flowers, male and female, on the same 

 stem. 



Puebla: Hacienda Batan (4937). 



I combine this curious form with B. salebrosmn on account of its 

 characters as a whole. It is much nearer to it than to the known 

 synoicous or polyoicous species B. aciifiiiii, B. conostoinmn, and 

 B. Mildeanmn. 



