86 



tifid, ovate or deltoid-acuminate, 1-2 ft. 1. f-lj ft. w. naked, dark green, 

 pellucid,, thinly chartaceous, the base not reduced, the apex pinnatifid 

 and passing gradually into the serrate or serrulate point ; pinnae nearly 

 horizontal, inferior subdistant, petiolate, upper adnate and shortly de- 

 current, the lowest usually as large as any, the largest J-f ft. 1. 1-lf in. 

 w. cut on both sides one-third or halfway to the midrib into broad 

 rounded subcrenulate lobes J in. br. the interior one on the superior side 

 of the base usually much (or little) larger than the rest (and, rarely, 

 in the lowest pair of pinnae quite free) the interior ones on the lower 

 side of the midrib reduced, the basal one smallest with its inner margin 

 oblique with the strong, channelled wood-brown rachis, veins pinnate in 

 the lobes, single and forked, sori linear, curved, 2-5 li. 1. often con- 

 fined to the lowest exterior veinlet, or occupying as well several above, 

 only the first however being double; involucres narrow, thin. A. am- 

 biguum. Eaddi, Fil. Bras. 1 1 54, 54 Ms. 



Frequent in damp woods and forests from among the lower hills up 

 to 4,000 or 5,000 ft. alt. a much larger plant as a rule than any of the 

 arboreum group, , marked by the broader pinnae, nearly uniformily 

 lobed to about the same depth throughout, those of the upper part 

 adnate-decurrent, and of the lower petiolate. The majority of local 

 specimens are fertile only on the exterior veinlet, but occasionally nearly 

 all are fertile. Sprengel's name is generally employed, but Raddi's has 

 priority. 



43. A. costale, Swartz. — Rootstook very stout, erect or oblique, at- 

 taining a foot or more high, the crown clothed with dark lanceolate 

 scales ; stipites caespitose, erect, stout, channelled. 1-2 ft. 1. base palea- 

 ceous ; fronds bipinnatifid, 2-4 ft. 1. 1J-2 ft. w., not. or little reduced at 

 the base, the apex pinnatifid, gradually passing into the serrate acu- 

 minate point, subcoriaceous, generally dark green, paler beneath, "pellu- 

 cid-dotted, the parenchyma naked, pinnae horizontal, oblong-lanceolate 

 acuminate, the lowest petiolate f-lj ft. 1. 2^-5 in. w. pinnatifid to 

 within a J— J in. of the costa, the apex subentire and serrated lobes \-\ 

 in. br. close, subfalcate, the interior one on the superior side usually a 

 little reduced, acute, spinulose-serrate in the outer part, the teeth within 

 appressed and faint, rachis and costae slightly deciduously scaly ; veins 

 pinnate,, the branches spreading, forked; sori oblique ; linear, 3-5 li. 1. 

 extending from the midrib \-\ way to the margin, usually confined to 

 the lower he If of the lobe, only the infeiior, if any, double , involucres 

 very narrow. — D. apollinaris, Fee Fil. Ant. t. 10. f. 1.— Segments 

 deeply and sharply toothed throughout — A. Desvauxii, Mett. 



Frequent in most forests from 2,000-6,000 ft. alt. This has no near 

 local ally, and is marked by its very robust size, subarboroid, caudex, 

 and simply pinnatifid pinnae, the latter giving it a very leafy ap- 

 pearance. 



44. A. striatum, Linn. — Eootstock stout, erect, eventually several 

 inches high, clothed with dark, blackish, lanceolate paler on the crown ; 

 stipites erect, strong, 1^-2 ft. 1. channelled, paleaceous at the dark base ; 

 rachis similar ; fronds erect, bipinnatifid, oblong-lanceolate, base not re- 

 duced, the acuminate apex pinnatifid, l|-2 ft. L f-lj ft, w. thinly 

 chartaceous, variable in colour, naked on the ribs puberulous pinnae 

 numerous, oblong-lanceolate, horizontal, deeply pinnatifid, J-f ft. 1. 

 lj-lf in. w. sessile or very shortly stipitate at the truncate base, the 



