178 TRICHOMANES 



FILMY FERN: Triclwmanes Boschianum. 



(T. radicans.) 



Fronds 4 to 8 inches long, an inch or more wide 

 at the base, tapering toward the apex, twice pin- 

 natifid, the divisions lobed and toothed; rachis and 

 upper part of stipe conspicuously winged. 



Fruit dots marginal, sporangia clustered around 

 a slender bristle, which is a prolongation of a vein, 

 and surrounded by a vase-like receptacle. In old 

 fronds the bristle is long and prominent. 



Found on moist cliffs from Kentucky to Ala- 

 bama. 



