.'144 Alexander W . Evans, 



known also from Jamaica, Mexico, Colombia, Venezuela, Peru, 

 and Bolivia. The present material is either completely sterile or 

 else bears scattered antheridial spikes. Fertile plants are readily 

 distinguished by the cylindrical perianths, these organs in most 

 members of the subgenus Thyopsiella being distinctly triplicate. 

 In the absence of perianths the apiculate leaf-lobes reflexed at 

 the apex and auriculate at the base, together with the auriculate 

 imderleaves wdth apiculate divisions and revolute margins will 

 aid in the identification of sjiecimens. 



