26 



ADIANTUM 



ADIANTUM 



AAAAA. Fronds at least bip innate, often tripinnate or 

 quadripinnate, with numerous rather small 

 fan-shaped or wedge-shaped leaflets with veins 

 radiating from the base. 

 B. Leaflets an inch or less across. 

 c. Edges deeply cut into a series of narrow lobes. 

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

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

 closely overlapping pin- 

 nae, light green ; leaflets 

 more or less wedge- 

 shaped at base, with cur- 

 ved sides and the outer 

 margin rounded and 

 deeply cut into 1015 

 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. t6nerum, 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. Lathomi,A. 

 Victdrice, A. rhodophyl- 

 lum, A.princeps, and A. 

 Bausei are horticultural 

 forms. Fla. and Trop. 

 Amer. 



20. J6rdani, C. Muell. 

 (A. emarginatum, 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^-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 quadripinnate, broader than long. 



22. C611isii, Moore. Fronds 1 ft. or more long, very 

 broad, the black rachises apparently repeatedly forking; 

 leaflets rhombic-ovate or cuneate, those towards the outer 

 portions longer and larger than those nearer the base. 

 Of garden origin, possibly a hybrid. 



cc. fronds mostly triangular or oblong, longer 



than broad. 



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

 or nearly circular. 



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

 1218 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. JEthidpicum, Linn. ( A. assimile, Swartz). Fronds 

 1 ft. or more long on slender stalks, 2-3-pinnate, 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. Afr. and Austral. 



25. excisum, Kunze. Fronds 2-3-pinnate, 6-12 in. long, 

 3-4 in. wide; leaflets about Kin. wide, roundish, with the 

 margin cut into small rounded lobes ; sori large, 2-4 to 

 each leaflet, kidney-shaped or circular. Chile. 



35. Pinna of Adiantum 

 concinnum. Natural size. 



DDD. Shape of leaflets distinctly cuneate at the base, 

 E. Indusia oblong or indistinctly lunate. 



26. Capillus - VSneris, Linn. (A. Fergusoni, A. Mai- 

 risii, Moore) . Fig. 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 . Farley ense ; a com- 

 pact imbricated form is very effective. 



27. b611um, 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. cuneatum, Langs. & Fisch. (A. cemulum, A. mun- 

 dulum, Moore. A. Versaillense, A. fragrantissimum, 

 Hort. ) . Fronds 3-4-pinnate, deltoid, 6-15 in. long, 5-9 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- 

 riegatum is one. 



29. Moorei, Baker (A. amdbile, Moore, not Liebm.). 

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

 leaflets %-%in. long, rhomboidal, with wedge-like base, 

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

 Peru. 



30. Wagneri, Mett. (A. decorum, A. Wiegandi, A. ele- 

 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. A. Siebreclitii, 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. rub611um, Moore. Fronds 4-6 in. long, deltoid, bi- 

 pinnate ; texture membranous, bright green, reddish 

 when young ; leaflets %in. 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. 



36. Pinna of Adiantum Capillus-Veneris. Natural sue . 



