ACROGENS. 13 



D. aldia, D. nodosa, 'W . Ind., S. Am. 2, Mardttia. Ebiz. large, glo- 

 bose, scaly; fronds broad, 2-3-pinnate, If . -stalk fleshy. M. fraxinea, 

 S. Af. ; Pacific Islands. 3. Angiopteris. Ehiz. (or caudex) massive, 

 3° high. Lf -stalk stout, fleshy, edible ; fronds large. 2-pinnate. Few, 

 but fine, species. E. Ind. and islands. 4. Kaulfussia, rhiz. thick, 

 frond coarse, ternate, reticulate. Ind., .lava. 



Tribe 2. Osmundaceae.— Ring partial, or reduced to a disk. 2 gen- 

 era ; 12 species. Temperate regions. 1. Todea. Caudex short, erect ; 

 fronds 2-pinnate. T. bdrbara [africana), fronds thick; T. leptop- 

 teris, fronds pellucid-membranous; New Z., S. Af. 2. Osmunda, 

 Flow^eking F. Caudex creeping ; end producing a crown of showj' 

 fronds 1-2-pinnate, 2°-4° high ; fertile frond contracted, paniculate. 

 O. regdlis, Royal F., fronds 2-pinnate, Fig. 33. O. GLaytoniana, 

 fronds pinnate, lanceolate. O. cinnam.dmea, Cinnamon F., similar 

 to last ; fruit bright cinnamon color. N. Am. 



Tribe 3. Lygodiaceae. — Ring replaced by a cap. 5 gen. ; 60 spec. ; 

 warm regions, both worlds. 1. Lygodium, Climbino F. Frond com- 

 pound, rachis slender, climbing; upper pinnae fertile. 'L. palmdium, 

 rachis 2°-4° high, pinnae palmate ; shady woods. L. japonicum, ra- 

 chis 10°-12° high, pinnae ovate'; Japan. 2. Hydroglossum, similar 

 to L., but veins netted. Few species ; Mexico, Pacific Isles, Mada- 

 gascar. 3. Schizaea. Small, not climbing ; fronds wiry, forked, 

 with pinnasform fertile appendages. S.JlabeUum., fan-shaped; Brazil. 

 S. pusilla, linear. New Jersey. 4. Aneimia. Not climbing. A. 

 Phyllitidis, fronds 12'-18' high, lower pinnse long-stalked, 3-4-pinnu- 

 late ; fertile, flower-like ; upper part pinnate. S. Am. A. adian- 

 iifoHa, similar, sterile part of frond 2-3-pinnate. S.Florida. 6. Moh- 

 ria thurifraga, only species ; fronds 2-pinnate, with odor of incense. 



Tribe 4. Gleicheniaceae. — Ring complete, nearly horizontal ; 2 

 gen. ; 30 spec. ; Southern Hemisphere. 1. Gleichenia. Rhiz. creep- 

 ing ; frond dichotomously forked, rigid ; ultimate segments pinnati- 

 fld. G. Hermdnni, rhiz. aromatic, edible ; S. Am. 2, Platyzoma 

 microp/ipUum, only gen. and spec. ; dwarf; fronds linear. Australia. 



Tribe 5. Ceratopter^cese.— Ring broad, nearly complete, obliquely 

 vertical. Spores few, trigonal, elegantly marked with concentric lines. 

 Aquatic. Only genus : Ceratdpteris (Parkeria) thalictroides, Water- 

 Etie F. ; frond much dissected, succulent ; young shoots edible. Tropics, 

 both hemispheres. 



Tribe 6. HymenophyllaceBB. — Ring on a plane nearly perpen- 

 dicular to its point of attachment. Sporangia short-pedicelled on re- 

 ceptacles projecting from the ends of the free veins and included in a 

 cup-shaped involucre. Rhiz. creeping, thread-like ; fronds filmy-pel- 

 lucid. 3 gen. ; 200 spec. ; tropics. 



1. Hymenophyllum. Film Fekn. — Many species in hot, damp 

 tropical forests of both hemispheres. H. Tunbridgense, fronds lan- 

 ceolate, pinnate, pinnae pinnatifid ; Tunbridge Wells, Eng. 2. Tri- 

 chomanes, Bristle F. Many species ; habitat of H. T. rddicans 

 (specidsttm), fronds 4'-8' high, lanceolate, pinnate, pinnje 1-2-pin- 

 natifid. On wet rocks, Tenn. and Ala. ; Ireland ; Madeira. 3. L6x- 

 s6ma, not pellucid ; fronds decompound. Australia. 



Tribe 7. Cyatheaceae. Tree Ferns. — Ring complete, obliquely 

 vertical. Sporangia sometimes short-pedicelled. Caudex erect; 



2 



