26 



ADIANTUM 



ADIANTUM 



Fronds <il 1,'ast hip',,,,, 

 qua,h-,li,„,i,il, , „-,lh , 

 fuii-.sl,,,/„,l ■,,,r,,l,ir-sl. 

 radiuti,iy front tlit bus 

 B. Leaflets i 



inch or less acroas. 

 c. Judges deeply cut into a series of narroiv lobes. 

 18. FarleyfinBe, Moore. Fig. 34. Fronds often reach- 

 ig 15-24 in. in length, forming a rich profusion of 

 closely overlapping pin- 

 n», light green; leaflets 

 more or less wedge- 

 shaped at base, with cur- 

 ved sides and the outer 

 margin rounded and 

 deeply cut into 10-15 

 narrow lobes, which rare- 

 ly bear sori. Barbadoes. 

 I".H. 19: 92. -Said to be a 

 garden variety of A. te- 

 nerum, but apparently a 

 good species, 

 cc. Edges not lacin- 

 iately cut. 



19. t^nerum, Swartz. 

 Fronds deltoid, 12-15 in. 

 long, two-thirds as wide, 

 the terminal leaflets 

 equally, the lateral un- 

 equally wedge-shaped at 

 base, all of them rhombic 

 and deciduous when dry, 

 with 10 or less small sori 

 on the outer and inner 

 margins. A. Li)tl,"t„i,A . 

 Viotbrice, A. ili",lo/iliijl- 

 lum, A.princ 11^, anil .1 . 

 Baitsei are horticultural 

 forms. Fla. and Trop. 

 Amer. 



20. Jfirdani, C. Muell. 

 {A. emargindtum, D. C. 

 Eaton, not Hook.). 

 Fronds 1 ft. or more long, 

 6 in. wide, mostly twice 

 pinnate, with nearly 

 semicircular leaflets ; 



sori elongate, the indusium almost continuous around the 

 margin of the leaflet. Calif, and Oreg. 



21. Williamsii, Moore. Fronds triangular, nearly 1 ft. 

 high ; leaflets nearly semicircular, 3— 4-lobed on the outer 

 margin, bearing 5-8 sori covered with oblong indusia. 

 Peru. — Similar in habit to the last, but smaller and with 

 more numerous sori. 



BB. Leaflets mostly less than a half inch across. 

 c. Fronds at least quadripinnale, broader than long. 



22. C611isii, M^oore. Fronds 1 ft. or more long, very 

 broad, the black rachises apparently repeatedly forking; 

 leaflets rhombic-ovate orcuneate, those towards the outer 

 portions longer and larger than those nearer the base.— 

 Of garden origin, possibly a hybrid. 



cc. Fronds mostly triangiflar or oblong, longer 



than broad. 



D. Shape of leaflets rhombic, the indusia kidney-shaped 



or nearly circular. 



23. concinnum, HBK. Fig. 35. Fronds 2-3-pinnate, 

 12-18 in. long, 6-9 in. wide, on rather stout black stalks ; 

 leaflets rhombic-oblong, slightly lobed; sori 4-8 on each 

 leaflet, usually set close together. Mex. to Braz. 



DD. Shape of leaflets roundish with obtuse base, small 

 or medium size. 



24. aithidplcum, Linn. (jfl. assfmiZe, Swartz). Fronds 

 1 ft. or more long on slender stalks, 2-3-plnnate, rather 

 narrow; leaflets roundish or obscurely 3-lobed, the mar- 

 gin finely serrulate ; sori 2-3 to a leaflet, with oblong or 

 kidney-shaped indusia. Af r. and Austral. 



25. excisum.Kuiizc. Fronds 2-3-pinnate, G-12 in. long, 

 3-4 in. will.'; l.-iillils Hl)(.iit i + iii. wide, roundish, with the 

 margin <-iiI iiit<t siikiU rounded Idhes; sori large, 2—4 to 

 each leaflet, kidney-shaped or circular. Chile. 



DDD. Shape of leaflets distinctly cuneate at the base. 

 E. Inditsia oblong or indistinctly lunate. 



26. Capillus -Veneris, Luan. {A. F^rgusoni, A. Mai- 

 rlsii, iloore). Pig. 36. Fronds 2-3-pinnate, 6-20 in. long, 

 3-8 in. wide; leaflets nearly Kin. wide, more or less ir- 

 regularly lobed at the outer margin ; sori 1-3 to each 

 leaflet, with oblong or more or less elongate narrow 

 indusia. Native southward, and widely distributed 

 throughout the Old World.— Exists in many varieties, 

 some of them deeply lobed, like A. Farleyense ; a com- 

 pact imbricated form is very effective. 



27. bfiUum, Moore. Small, 3-8 in. high, bipinnate; leaf- 

 lets with the outer margin erose and often divided into 

 2-3 shallow lobes ; sori 2-3 to each leaflet, rather long 

 and broad or somewhat lunate. Bermuda. 



EE. Indusia nearly circular, with a narrow sinus. 



28. cuneitum, Langs. & Fisch. {A. cemuhi,,,, A. mini- 

 dulum, Moore. A. VersailUnse, A. fragrfintit<si„,,tm, 

 Hort. ) . Fronds 3^-pinnate, deltoid, 6-15 in. loug, ',-•.> in. 

 wide ; leaflets numerous, obtuse or broadly wedge-shaped 

 at base, the margin rounded and more or less crenately 

 lobed ; sori 3-5 to each segment, with rather small rounded 

 indusia. Braz. — Runs into many forms, of which A.va- 

 riegdtum is one. 



29. Modrei, Baker {A. amdbile, Moore, not Liebm.). 

 Fronds 2-3-pinnate on long slender stalks, 6-15 in. long; 

 leaflets M-Hin. long, rhomboidal, with wedge-like base, 

 deeply lobed ; sori of medium size, 4-6 to each leaflet. 

 Peru. 



30. Wdgneri, Mett. (A. decorum, A. Wiegandi, A. ile- 

 gans, A. Oweni, A . cyclosbrum, Moore). Fronds 2-3-pin- 

 nate, 6-9 in. long, 4-6 in. wide; lateral leaflets rhomboid, 

 the terminal cuneate, slightly lobed or incised ; sori 4-6 

 to each leaflet, with very large membranous circular in- 

 dusia. Peru. — .4. Siebrechtii, Hort., "supposed to be a 

 cross between A. decorum and A. Williamsii,^' has 

 strong, graceful fronds thickly set with round pinnules 

 of firm texture. 



31. rubSllum, Moore. Fronds 4-6 in. long, deltoid, bi- 

 pinnate ; texture membranous, bright green, reddish 

 when young ; leaflets Kin. wide, deltoid or the lower 

 rhomboid, the outer margin deeply lobed and the lobes 

 finely toothed ; sori round at the apices of the lobes. 

 Bolivia. 



