PHEGOPTERIS Fee. 
Sori round, rather small ; no indusium. 
in. P. Phegopteris (L.) Underw. Beech Fern. Fronds 
3-20 inches long ; laminae triangular, longer than broad, bipinnati- 
lid ; pinnae linear-lanceolate, the lowermost pair standing forward ; 
basal segments of each pinna adnate to the main rachis ; sori near 
the margin. Damp woods and shaded banks. Abundant in nor- 
thern, less so in southern sections. Early July. Around the world 
between the 36th and 66th parallels, north latitude. 
1 12. P. hexagonoptera (Miehx. ) Fee. Angled Polopody. 
Fronds 5-20 inches long ; lamina* triangular, broader than long, bi- 
pinnatifid ; pinnae lineai’rlanceolate, the lowermost pair very large, 
standing forward and upward, with pinnatifid pinnules ; basal seg- 
ments adnate to the main rachis, and connected, forming a many- 
angled wing ; sori near the margin of the ultimate segments, some 
between the sinus and midvein Plant growing in dryer situations 
maturing later, and with more distant pinnae than in Phegopteris 
Phegopteris. Fragrance powerful and peculiar. Generally distrib- 
uted, but most common in R. I. and Conn. Latter part of August. 
Occurs only in the U. S., principally east of the Mississippi river. 
1 14. P. Dryopteris (L.) Fee. Oak Fern. Fronds ternate, 
the three divisions stalked and bipinnate. Light green. Moist, 
shaded banks. Common northward, less so in southern sections. 
Easily preserved and very pretty June. Across Northern North 
America and in Northern Europe and Asia. 
DRYOPTERIS L. ( ASP1DIUM .) Shield Fern. 
Sori dorsal ; indusia round and peltate, fixed by the center, or rcni- 
form, and fixed by the sinus, opening all around the margin. 
120. D. acrostichoides (Michx.) Kuntze. Christmas Fern. 
Fronds thick, rigid and evergreen, 1-2| feet long, lanceolate, once 
pinnate ; pinnae linear-lanceolate, scythe-shaped, auricledon the up- 
per side and furnished with bristly teeth ; fertile pinnae contracted, 
bearing soon confluent sori ; indusium orbicular, fixed by its de- 
