FILICES. (ferns.) 591 



2. A. Capillus-Veneris, L. Frond ovatc-lanccolate, 2 -3-j (innate; pin- 

 nules very delicate, oblique, broadly wedge-shaped or Bometimea rhomboid, 



rather long-stalked, the upper margin deeply incised and fruit-hearing or sterile 

 and dentate ; stipe slender, eheneous ; raehis almost capillary, tlexuous. — Mostly 

 pendent from Limestone cliffs, Florida, Alabama, and westward. — Fronds 1°- 

 3° long. 



8. BLECHNUM, L. 



Sporangia on a transverse elongated receptacle parallel to the midrib, combin- 

 ing the veins near their bases. Indusium fixed by its outer margin, opening in- 

 ward. Veins of the sterile fronds free. Fronds simple or pinnate. 



1. B. serrulatum, Michx. Fronds erect, rigid, pinnate; pinna; articu- 

 lated with the raehis ; fertile ones linear-lanceolate, acute, finely and sharply 

 serrate ; fruit close to the midrib ; sterile ones broader, bearing a few chaffy 

 scales along the midrib. (B. angustifolium, Willd.) — Florida, Michaux, 

 Buckley ! 



9. WOODWAEDIA, Smith. 



Fruit-dots linear-oblong, in one or two series on transverse anastomosing 

 veinlets parallel and near to the midrib. Indusium attached by its outer margin 

 to the veinlet, opening inward. Veins more or less reticulated, free toward the 

 margin of the frond. Fronds mostly pinnatifid or pinnate. 



1. W. angUStifolia, Smith. Fronds smooth, pinnatifid ; the sterile ones 

 ovate, with broadly-lanceolate finely serrate divisions, united at the base and 

 decurrent on the stipe, the veins reticulated in several series of areoles ; fertile 

 fronds taller, with narrowly linear entire divisions, and a single series of elon- 

 gated areoles, each containing an oblong fruit-dot with a vaulted indusium. 

 ( Acrostiehum areolatum, L. W. onocleoides, Willd.) — Bogs and shady banks, 

 Florida, and northward. — Rootstock creeping, elongated, as thick as a goose- 

 quill. Stipe 6'- 12' high, about the length of the frond. 



2. W. Virginica, Willd. Fertile and sterile fronds alike, ovate, smooth, 

 pinnate ; pinna} lanceolate, narrowed at both ends, pinnatifid ; segments oblong, 

 obtuse ; veins forked, forming a single series of areoles along the midrib both of 

 the pinna? and of the segments ; areoles fruit-bearing in the fertile frond. — Shal- 

 low ponds, Florida to Mississippi, and northward. — Rootstock as thick as one's 

 finger, creeping, elongated, with a tough black exterior, the interior soft and 

 white. Fronds 1°- 4° high; stipe smooth. 



10. CAMPTOSORUS, Link. Walking-leu . 



Fruit-dots linear or oblong, straight or curved, scattered irregularly on the back 

 of the frond, often opposite in pairs, or converging and united. Indusium linear, 

 attached by one margin to the reticulated veins of the simple frond. 



1. C. rhizophyllus, Link. Fronds evergreen, lanceolate, cordate or 

 hastate at the base, long-acuminate, often rooting at the extremity and giving 



