217 
Tripe XII.—AcrosticHEe# 
Sori spreading over the whole under- 
surface or rarely over both surfaces of the 
frond, not confined to the veins only. 
Fertile fronds or segments always more or 
less contracted. 
Fronds of two forms: the fertile 
fronds contracted and very narrow; the 
barren fronds simply pinnate ; the pinnz 
leathery in texture ; veins simple or forked, 
fine and close, generally quite free to the 
margin, rarely anastomosing; stipes 
adherent to the rhizome; pinnz articu- 
late with the rachis. 
Genus XLIV.—Stenochlena J. Sm. 
PAGE 
181 
Fronds pinnate, bipinnatifid or almost - 
pinnate, bipinnate ; sterile frond. generally 
proliferous ; fertile frond much contracted ; 
veins pinnate, all free; stipes adherent to 
rhizome. Genus XLV.—Polybotrya H. B. K. 
Veins copiously anastomosing with free 
veinlets in the meshes ; main veins distinct 
or not distinguished from the rest ; fronds 
simple or pinnate, generally of two forms, 
-782 
the fertile being much contracted, or ' 
rarely simple and all similar, bearing the 
