ttt Leaves 2-pinnatifid; pinnae linear, ovate or lan- 
ceolate, widest at the base. 
* Pinnae obtuse or acute. 
5. D. cristata (L.) A. Gray. IEICE 
Polypodium cristatum L.Sp. Pl. 1090. 
Aspidium cristatum Sw.\.c. 37. Haton, 1. c. 2: 
i653. 9, 00s/insGtay, lic. 688. Clu¢e, 1.¢.130, 
Nephrodium cristatum £. C. Rich. ; Michx. FI. 
2: 269. Waters, |. c. 225. 
Dryopteris cristata A. Gray, 1848. Man. 631. 
Under. in Ill. Fl. 1: 16; Nat. Ferns 113 ; in Britt. 
Man. 15. 
CRESTED FRRN. 
Plants 6 dm. or higher ; leaves linear or linear-lanceo- 
late ; pinnae subequal, ovate-oblong to triangular-ovate, 
5 cm. or longer, obtuse or acute; lobes rounded, serrate ; 
sori few or as many as 6 to eaeh lobe. 
In moist woods. 
I have never seen the typical D. crzstata in our region. 
Specimens from Maryland and Virginia approach more 
nearly Aspidium lancastriense Spreng. (Anleit. 3: 
134. 1804. —-D. cristata lancastriensis.) This form 
differs from the European type by its longer and more 
slender upper pinnae. An extreme form with linear 
leaves and obtuse pinnae (D. cristata mariana) is 
found occasionally. Intermediate forms abound in any 
D, cristata colony. 
42 
