ADIANTUM 



rubellum) : cemulum, No. 28 ; ^thiopicum, 24 ; affine, 

 9 ; amabiie, 29 ; assimile, 24 ; Baiisei, 19 ; bellum, 27; 

 Capillus-Veneris, 26 ; caudatum, 2 ; Collisii, 22 ; eon- 



' "" * — "" • curvatum, 16 ; ct/closorum, 



u, 8 ; digitatum, 35 ; dolabri- 



cinnum, 23 ; cuneatum, 

 30 ; decorta 



forme, 1; Edgfii-orthii,'2; elegans^ 

 ginatum, 20 ; excisuni, 25 ; Farleyeuse, 18 ; 

 Fergusoni,2Q ; formosum, 11; fruynnitis.ii- 

 mum, 28 ; gTacillimiuu, 'M : hispidulum, 17 ; 

 intermedium, 10 ; Jordani, 20 ; Kaulfussii, 5 ; 

 iMthomi, 19; LeGrandi, 34; luaulatum, 1; 

 macrophyllum,4; Malrlsii,2io- raonochlauiys, 

 32; Moorei, 29; mundiilum, 28; Novre-Cale- 

 doniffi, 14 ; Oweni, 30 ; palmatum, 35 ; peda- 

 tum, 15 ; Penivianum, 3; polyphyllum, 7; princeps, 19 ; 

 pubescens, 17 ; pulvemlentum, 12 ; rhodophyllum, 19 ; 

 rhomboideum, 13 ; rubellum, 31 ; Sanctce Catharince, 6 ; 

 Siebrechtii, 30 ; speciostim, 35 ; tenenim, 19 ; trapezi- 

 forme, 6; variegatum, 28; venustum, 33; Versail- 

 lense, 28; Victorim, 19; villosum, 13; Wagneri, 30; 

 Wiegandi, 30 ; Williamsii, 21. 



A. Fronds with a single row of small leaflets on either 

 side, rooting at the apex. 



1. lunulituin, Burm.( J. (fo?(T6)-i7(5r)HC,Hook.). Fronds 

 1 ft. long on blackish wiry polished stipes; lower leaflets 

 nearly semicircular, all on hair-like stalks. India, Trop. 

 Amer., Australia. 



2. cauditum, Linn. {A. Edgeworthii, Hook.). Fronds 

 6 in. to 1 ft. long on short brownish densely hairy stipes ; 

 leaflets deeply cut into several spreading narrow lobes. 

 Old World. 



AA. Frond.^ wilh it-'tualh/ a .tinfjle rote of large leaflets 

 oil either side, not rooling at the apex. 



3. Peruviinum, Klotzsch. Fronds 1 ft. or more long, on 

 polished stipes, with obliquely ovate pointed leaflets, 2 in. 

 long by 1 ^2 in. wide, on slender stalks ; sori 8-10 on either 

 side of the leaflet, twice as long as wide. Peru. 



4. macroph^llum, Swartz. Fronds 1 ft. long, on rather 

 stout polished stipes, with 4-6 pairs of wedge-shaped ses- 



ADIANTUM 25 



sile leaflets \}4-2 in. long by %-l in. wide ; indusium 

 nearly continuous on either side of the leaflet. Trop. 



5. KauUusBii, Kunze. Fronds 6-8 in. high, on slender 

 black stalks; leaflets 5-11, 2 in. long, %-l in. wide, with 

 unequal base ; indusia very long and narrow, forming an 

 almost continuous marginal band on either side of the 

 leaflets. Mex., W. Ind. 



AAA. Fronds at least bipinnate, the segments ditnidiate^ 

 i. e. irith the veinlets all springing from the lower 

 side of the leaflet, whieh is twice as long as broad. 

 B. Leaflets l%-2 in. long. 



6. trapezi!6nne, Linn. FrondslSin. or more high, with 

 the terminal It-ufl.t l..ni;.Ttlian the lateral; leaflets trape- 

 zoidal, with ]iaiall.l si.lc^. '.j-?4in. wide, lobed, and with 

 numerous sori. .1. S.iiirt.i -Cilharlnw is a form with 

 deeper lobes. Trop. Amer. 



BB. Leaflets smaller, an inch or less long. 

 c. stalks polished, smooth. 



7. polyphyllum, Willd. Fronds often tripinnate, with 

 stout black stalks ; pinnae 6-8, long, with closely set leaf- 

 lets which are %-l in. long, the upper margin curved, 

 with 4-6 circular or oblong indusia. S. Amer. 



8. diiphanum, Blume. Fronds simply pinnate or usu- 

 ally with 1 or 2 pinnas at the base ; leaflets Kin. long, 

 !<iin. wide, with numerous sori placed in the sinuses of 

 the inner and outer edges. Asia to N. Zeal. 



9. afHne, Willd. Fronds bipinnate, with acentral pinna 

 and several lateral ones ; leaflets not exceeding %m. long, 

 Kin. wide, the upper edge parallel with the lower, and 

 crenate, bearing numerous rounded sori on the upper 

 and outer margin. N. Zeal. 



cc. Stalks polished but somewhat tomentose. 



10. intermedium, Swartz. Fronds 1 ft. or more long, 

 with a terminal pinna and 1-3 lateral ones on each side ; 

 leaflets 1 in. or more long, with interrupted sori on the 

 upper and two-thirds of tin- ont.r mnv'rins. Trop. Amer. 



CCC. .S7- ■ '"lirll. 



11. formdsum, R. r>i 1 i i i ii. long, two-thirds 

 as broad, mostly tripiiinii-. nmiIi loii-h scabrous stalks 

 and rather smafl deeply Iubcd leaflits W-^in. long, with 

 rounded and toothed outer margins. Austral. 



12. pulvemlentum, Linn. Fronds often a foot long.with 

 a large terminal pinna and several lateral ones, bipin- 

 nate ; stalks purplish, hairy,as are also the rachises ; leaf- 

 lets 54-1 in. long, Kin. wide, closely placed, the outer 

 edge rounded or truncate. W. Ind. 



13. villdsum, Linn. {A . rhombo'ideiim , Swartz) . Fronds 

 larj,'.-, witli a terminal an.l several lateral pinna! 6-12 in. 

 loiiir. on stout villotis-hairy stalks; leaflets numerous, 

 nearlv 1 in. l..n- ' ,in. wiile, trapi-zoidal, with the inner 

 side j.arallel tf the raeliis ; indusia forming an almost 

 continuous line along the upper and outer margins. W. 

 Ind. and S. Amer. 



14. Ndvae-Caleddniae, Keys. Fronds 6-8 in. long and 

 wide, somewhat pentagonal, once pinnate with one or two 

 secondary basal pinnse on the lower side at base ; leaflets 

 attached to the rachises by a broad base, nearly 1 in. long, 

 pointed, irregularly incised, bearing 1-4 rounded sori 

 next to the base. New Caledonia. 



A.\AA. Fronds forked, the two branches bearing pinnte 



from the upper side. 



B. Stalks polished, smooth. 



15. peditum, Linn. Fig. 33. Common Maidenhair of 

 our northern states, with circular fronds on purplish 

 stalks 1 ft. or more high. — Sometimes transplanted into 

 gardens, requiring a shady, moist and protected place. 



16. curvitum, Kaulf . Fronds forked and with the main 

 divisions once or twice forked; leaflets 1-1 ^^ in. long, 

 nearly ^^in. wide, the upper margin rounded and lobed. 



BB. Stalks scabrous {or rough). 



17. Mepidulum, Swartz (A. pubescens. Schk.). The 

 two divisions branching like a fan. with the largest pinnae 

 C-9 in. long, made up of numerous leaflets Hin. or more 

 long, two-thirds as broad, with numerous circular indusis 

 on the upper and rounded outer margin. Old World. 



