Mr. W. Palmer [Fern Bulletin 14: 78. 1906.] has 
recorded two forms of this species in Maryland and Vir- 
ginia: A. f. femina [typica] and A. f. femina rubel- 
lum. The smaller green-stiped form agrees well with 
specimens collected near Stockholm, Sweden. Inthese 
the pinnules are normally oblong, obtuse and less than 
r cm. in length. In the larger or southern red-stemmed 
form there appears to be a greater variation—the pinnae 
being often crowded, with pinnules sometimes 2 cm. 
long and 6-8 mm. broad. 
16. CAMPTOSORUS Link, 1833. 
Rock-loving ferns growing in colonies. Leaves simple, 
rooting at the tips. Sori linear, scattered. 
1, C. rhizophyllus (L.) Link. Pls. 
Phyllitis parva saxatilis per summitates folit pro- 
lifera. Banister ; Ray. Hist. 2: 19 27. 
Asplenium rhizophyllum £. Sp. Pl. 1078. 
Camptosorus rhizophyllus Link, Hort. Berol. 2: 
60s. 7 ato77. eh cise Ni winee mG Gett A Oee tam tT 
Gray Man. 685. Underw. in Ill. Fl. 1: 21; Nat. 
Ferns 108; in Britt. Man. 13. Clute, Ferns 265. 
Waters, Ferns 179. ; 
WALKING FERN. 
Low plants; leaves in a cluster from the short root- 
stock, cordate, auricled or halberd-shaped and gradually 
narrowed into a point, which is sometimes 1.5 dm. long 
and 1mm. or wider. The entire leaf is sometimes 2.5 
dm. long. 
On shaded limestonerocks. 
37 
