592 FILICES. (FERNS.) 



Var. C<mdata. Frond somewhat mere coriaceous ; the pinnules with 

 narrower and less crowded lobes, the terminal one linear and prolonged (l'-2' 

 in length), entire, forming a tail-like termination, or the whole of many of the 

 pinnules sometimes linear and entire. (P. caudata, L.) Common southward, 

 and at the north varying into the typical form. 



5. ADIANTUM, L. MAIDENHAIR. (Tab. 10.) 



Fruit-dots marginal, short; borne on the under side of a transversely oblong, 

 crescent-shaped or roundish, more or less altered margin or summit of a lobe or 

 tooth of the frond reflexed to form an indusium : the sporangia attached to the 

 approximated tips of the free forking veins. Main rib (costa) of the pinnules 

 none, or at one margin. Stalks black and polished. (The ancient name, from 

 a privative and 8tmVa>, meaning unwetted, the smooth foliage repelling rain-drops.) 



1. A. pCfltitlim, L. Frond forked at the summit of the upright slender 

 stalk (9 ; - 15' high), the forks pedatcly branching from one side into several 

 Blender spreading divisions, which bear numerous triangular-oblong and oblique 

 short-stalked pinnules ; these are as if halved, being entire on the lower margin, 

 from which the veins all proceed, and cleft and fruit-bearing on the other. 

 Eich, moist woods. July. A delicate and most graceful Fern. 



6. CHEIL.ANTIIES, Swartz. LIP-FERN. (Tab. 10.) 



Fruit-dots small and roundish, solitary or contiguous ne_xt the margins or tips 

 of the lobes, which are recurved over them to form a hood-like (herbaceous or 

 membranaceous) indusium; the sporangia borne on the tips of free forking 

 veins. Fronds 1-3-pinnate, the sterile and fertile nearly alike; the divisions 

 not halved, the main rib central. (When the indusium becomes continuous, the 

 genus passes into Allosorus.) (Name composed of x*^s, #p, and avdos, 

 fioiver, from the shape of the indusium.) See Addend. 



1. C. vestlta, Willd. (not of Hook.?) Fronds 2-pin.nate (slender, 4' -7 

 high), and stalks hirsute with loose and rather scattered rusty hairs ; pinnules ob- 

 long, pinnatifid (2" -4" long), their lobes oval or oblong, the recurved portion 

 forming the indusium herbaceous. Shaded rocks, S. Pcnn., Virginia, Ken- 

 tucky, and southward. Fronds soon nearly glabrous above. 



2. C. tomeiltosa, Link. Fronds (l-l high) with the rather stout 

 stalk, &c. densely u-oollt/ and viUous throughout (the upper surface becoming smooth- 

 ish with age), thrice pinnate ; pinnules obovate or roundish, nearly entire, sometimes 

 confluent, the recurved narrow margins forming an almost continuous involucre. 

 (Nephrodinm lanosum, Michx. in part?) Mountains of Virginia? Kentucky; 

 thence westward and southward. 



7. WOOI>WAKDIA, Smith. WOODWARDIA. (Tab. 10.) 



Fruit-dots oblong or linear, approximate or contiguous, parallel to and near 

 the midrib, on transverse anastomosing veinlets, in one or rarely two rows ; the 

 veins reticulated towards the midrib, mostly forking, free towards the margin of 



