POLYPODIACEAE 11 



lanceolate, 8-20 cm. long, 3-4-pinnate ; leaflets crowded, 0.5 mm. long, white-tomentose 

 above,, very chaffy beneath. 



On rocks, Llano County, Texas to Arizona and northern Mexico. 



13. NOTHOLAENA R. Br. 



Relatively small rock-inhabiting plants with tomentose scaly or powdery foliage. 

 Leaves various : blades 1-4-pinnate or pinnatifid. Sori roundish or oblong, soon con- 

 fluent into a narrow band. Indusium wanting : sporanges sometimes at first covered by 

 the inflexed leaf-margins. Veins free. 



Leaf-blades covered with white or yellow powder beneath. 



Leaf-blades 3-4-pinnate at the base. 1. N. dealbata. 



Leaf-blades barely 2-pinnate. 



Leaf- blades deltoid-ovate, white-powdery beneath. 2. N. Candida. 



Leaf-blades pentagonal, yellow-powdery beneath. 3. N. Hookeri. 



Lfeaf-blades scaly or tomentose beneath. 



Leaf-blades 1-pinnate, narrow, elongated. 4. N. sinuata. 



Leaf-blades 3- pinnatifid, oblong-lanceolate. 5. N. Aschenborniana. 



1. Notholaena dealbata (Pursh) Kunze. Rootstock chaffy with narrow brown 

 scales. Petioles tufted, wiry, shining, dark brown, 2.5-4.5 cm. long; leaf-blades triangu- 

 lar-ovate, acute, broadest at the base, 2.5-10 cm. long, 3-pinnate, the rachis black and 

 shining ; leaflets ovate or obovate, obtuse, lobed, crenate or entire, small, scarcely 2 mm. 

 long, white and powdery on the lower surface. 



On calcareous rocks, Missouri and Kansas to Texas and Arizona. 



2. Notholaena Candida ( Mart. & Gal. ) Hook. Rootstocks with rigid nearly black 

 scales. Petioles tufted, 7-15 cm. long, wiry, black and shining ; leaf-blades deltoid, pin- 

 nate, rather shorter than the petioles ; leaflets various, the lower with the lowest inferior 

 segments elongated and again pinnatifid, the 3 or 4 successive pairs lanceolate, upper leaflets 

 resembling the segments of the lower, white-powdery beneath, slightly revolute. 



On rocks, Texas and New Mexico. Also in Mexico. 



3. Notholaena Hookeri D. C. Eaton. Rootstocks densely covered with rigid dark- 

 brown scales. Petioles tufted, 10-20 cm. long, reddish brown, wiry, shining; leaf-blades 

 nearly pentagonal, 5-8 cm. in diameter, of 1 terminal and 2 lateral divisions ; terminal 

 division pinnatifid into a few toothed segments, the second pair larger than the first ; 

 lateral divisions bearing a single large pinnatifid basal segment on the lower side and above 

 it pairs of smaller ones, covered beneath with pale yellow powder. 



On rocks, Uvalde Canon, Texas, west to Arizona. 



4. Notholaena sinuata (Sw.) Kaulf. Rootstocks very chaffy. Petioles erect, 

 5-10 cm. long ; leaf-blades simply pinnate, 15-60 cm. long ; leaflets numerous, short- 

 stalked, roundish or ovate, entire or pinnately lobed, densely scaly beneath, with merely 

 scattered hairs above. 



On rocks, San Saba Texas, to Arizona and Mexico. Also in tropical America. 



5. Notholaena Aschenborniana Kl. Rootstocks short. Petioles tufted, 5-8 cm. 

 long, wiry, blackish, densely scaly ; leaf-blades oblong-lanceolate, 10-25 cm. long, 3-pin- 

 natifid ; segments lanceolate, cut into linear-oblong, crenate or pinnatifid ultimate seg- 

 ments, pale green above, densely mottled beneath with linear ciliate ferruginous scales 

 and also somewhat mealy ; sori black. 



On rocks, Texas to southern Arizona and Mexico. 



14. BLECHNUM L. 



Coarse swamp plants, with stout rootstocks. Leaves clustered : blades thickish. Sori 

 linear, contiguous or nearly so, parallel to the midrib and usually contiguous to it. In- 

 dusium membranous, distinct from the edge of the leaf-blade. Veins free. 



1. Blechnum serrulatum L. C. Rich. Petioles erect, nearly naked, 15-30 cm. long, 

 stout ; leaf-blades oblong-lanceolate, 30-60 cm. long, leathery, with 12-24 pairs of linear- 

 oblong leaflets ; margins very finely incised : veins very fine and close : fertile leaves with 

 much narrower blades than those of the sterile. 



In swamps, Florida. Also in tropical America. 



15. ANCHISTEA Presl. 



Large and rather coarse swamp ferns, with short oblong sori sunk in cavities in the leaf 

 and arranged in chain-like rows close to the midribs. Leaves uniform. Indusia fixed by 



