111 
2. Fronds 2-3 pinnate, segments 
with strong sharp serratures. 
4. A. felix feemina. 
II. Fronds 5-6 feet long. 
5. A. gymnogrammodes. 
1. Athyrium hohenackerianum Bedd. 
Rhizome short, densely covered with scales. 
Stipes tufted, scaly throughout. Fronds 6-18 
inches long, 14-3 inches broad, lanceolate or 
ovate-lanceolate, pinnate or almost bipinnate 
with pinnatifid apex; pinna 1-23 inches long, 
cut down nearly or quite to the rachis into ovate 
or oblong serrated segments. Texture herbace- 
ous. Surfaces naked. Rachis scaly below. 
Indusium curved or horseshoe-shaped, bullate 
(i.e., puckered). [Plate IX.] 
The limits of this species and of Athyriwm 
felix femina have not been clearly defined 
by authors. Indeed, small specimens of the 
latter fern are often mistaken for this species. 
The chief difference between the two seems to 
lie in the involucre which in Athyrium hohen- 
ackertanum, according to Hooker, in his ‘ Spe- 
cies Filicum,’ is ‘ singularly bullate, afterwards 
