ADIANTUM 



ADIANTUM 



219 



nearly H m - wide, the upper margin rounded and lobed. 

 Brazil. 



BB. Stalks scabrous (or rough). 



19. hispidulum, Swartz (A. pubescens, Schk.). Lve. 

 forked, two divisions branching like a fan, with the 



121. Adiantum Farleyense. 



(XK) 



largest pinnae 6-9 in. long, 

 made up of numerous Ifts. 

 J^in. or more long, two-thirds 

 as broad, covered with rather 

 long, stiff hairs, and with numerous cir- 

 cular indusia on the upper and rounded 

 outer margins. Old World. 



AAAAA. Las. at least bipinnate, often tripinnate or 

 quadripinnate, with numerous rather small,, 

 fan-shaped or wedge-shaped Ifts. with veins 

 radiating from the base. 



B. Lfts. an inch or less across. 

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



20. Farleyense, Moore. Fig. 121. Lvs. often reach- 

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

 closely overlapping pinnae, light green; Ifts. more or less 

 wedge-shaped at base, with curved sides and the outer 

 margin rounded and deeply cut into 10-15 narrow lobes, 

 which rarely bear sori. Barbadoes. Said to be a gar- 

 den variety of A. lenerum, but apparently a good 

 species. G.C. III. 49:73. 



cc. Edges not laciniately cut. 



21. tenerum, Swartz. Lvs. deltoid, 12-24 in. long, 

 two-thirds as wide, the terminal Ifts. equally, the lateral 

 unequally, 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. Lathomii, A. Victorix, 

 A. rhodophyllum, A. prlnceps, A. acutum, and A. 

 Bausei are horticultural forms. Fla. and Trop. Amer. 



^ 22. Jordanii, C. Muell. (A. emargindlum, D. C. 

 Eaton, not Hook.). Lvs. 1 ft. or more long, 6 in. wide, 

 mostly twice pinnate, with nearly semicircular Ifts.; 

 sori elongate, the indusium almost continuous around 

 the margin of the 1ft. Calif, and Ore. 



23. Williamsii, Moore. Lvs. triangular, nearly 1 ft. 

 long; Ifts. 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. Lfts. mostly less than a half inch across. 

 c. Lvs. at least quadripinnate, broader than long. 



24. Collisii, Moore. Lvs. 1 ft. or more long, very 

 broad, the black rachises apparently repeatedly fork- 

 ing; Ifts. rhombic-ovate or cuneate, those toward the 

 outer portions longer and larger than those nearer the 

 base. -Of garden origin, possibly a hybrid. 



cc. Lvs. mostly triangular or oblong, longer than broad. 



D. Shape of Ifts. rhombic, the indusia kidney-shaped or 

 nearly circular. 



25. concinnum, HBK. Fig. 122. Lvs. 2-3 pinnate, 

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

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

 1ft., usually set cjose together. Mex. to Brazil. Var. 

 latum, Moore. Differs from type by stiff upright habit, 

 and Ifts. twice as large and much separated. 



26. aneitense, Carr. Rootstock wide-creeping, cov- 

 ered with minute dark brown linear scales; I vs. 2-2 J^ 

 ft. long, the stalks castaneous, rusty hairy above; the 

 If .-blades deltoid, lJ^-2 ft. long and broad, 3^-pin- 

 nate, the segm. rhomboidal, the sori 4-6 to a segm. 

 Aneiteum, New Hebrides. 



27. tinctum, Moore. Lvs. on stalks 4-6 in. long, the 

 blades 2-pinnate, deltoid, the stalks black, glossy, 

 naked, the segms. rhomboid, 3-4 lines long, the lower 

 edge straight, the inner parallel to the rachis or just 

 overlapping it, the outer edge bluntly lobed, sori round, 

 on ultimate lobes. Costa Rica to Peru. 



DD. Shape of Ifts. roundish with obtuse base, small or 

 medium size. 



28. aethiopicum, Linn. (A. assimUe, Swartz). Lvs. 

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

 narrow; Ifts. roundish or obscurely 3-lobed, the mar- 

 gin finely serrulate; sori 2-3 to a 1ft., with oblong or 

 kidney-shaped indusia. Afr. and Austral. 



29. ezcisum, Kunze. Lvs. 

 2-3-pinnate, 6-12 in. long, 3^1 

 in. wide; Ifts. about %in. wide, 

 roundish, with the margin cut 

 into small rounded lobes; sori 

 large, 2-4 to each 1ft. ; kidney- 

 shaped or circular. Chile. 



ODD. Shape of Ifts. distinctly 



cuneate at the base. 

 E. Indusia oblong or indis- 

 tinctly lunate. 



30. Capillus-Veneris, Linn. 

 (A. Fergusonii, A. Mairlsii, 

 Moore). Fig. 123. Lvs. 2-3- 

 pinnate, 6-20 in. long, 3-8 in. 

 wide; Ifts. nearly Jiin. wide, 

 more or less irregularly lobed, 

 at the outer margin; sori <~ 

 1-3 to each 1ft. with oblong ' 

 or more or less elongate 

 narrow indusia. Native south- 

 ward, and widely distributed 

 throughout the Old World. 

 Exists in many varieties, some 

 of them deeply lobed, like 



A. Farleyense; a compact imbricated form is very 

 effective. 



31. helium, Moore. Small, tufted, 3-8 in. high: Ivs. 

 bipinnate; Ifts. with the outer margin erose and often 

 divided into 2-3 shallow lobes; sori 2-3 to each 1ft., 

 rather long and broad or somewhat lunate. Bermuda. 

 A greenhouse species. 



122. Pinna of Adiantum 

 concinnum. ( X H) 



