36 
Sori margiral; indusium more or less _two- 
valved ; receptacle elongated, columnar, pro- 
truding beyond the mouth of the indusium or 
included within it. 
Hymenophyllum polyanthos Sw. 
Stipes 2-33 inches long, wingless or narrowly 
[ 
a 
Fic. 10.—Hymenophyllum polyanthos Sw. 
(a) Pinna (x 7). 
6) A sporangium (magnified). 
