218 



ADIAN'lTM 



ADIANTUM 



mended for adiantums in general with the exception of 

 a much higher temperature, 65 to 70 at night and 75 

 to 80 during the day. The variety Glory of Moor- 

 drecht has the great advantage of producing fertile 

 spores and it also thrives in the lower temperatures 

 recommended for general adiantums. It gives promise 

 of being one of the most useful varieties for decorations 

 and cut-fronds use, as the fronds are very much hardier 

 than typical A. Farleyense and will compare well with 

 such kinds for standing as A. cuneatum, A. hybridan 

 and A. Croweanum. 



A. Lvs. with a single raw of small Ifts. on either side, 

 rooting at the apex. 



1. lunulatum, Burm. (A. dolabriforme, Hook.). Lvs. 



1 ft. long on blackish, wiry, polished stalks; lower Ifts. 

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

 Trop. Amer., Austral. G. 6:203. 



2. caudatum, Linn. (4. Edgeworthii, Hook.). Lvs. 

 6-12 in. long, on short, brownish, densely hairy stalks; 

 Ifts. deeply cut into several spreading narrow lobes. 

 Old World. Gn. 68, p. 315. 



AA. Lvs. with usually a single row of large Ifts. on either 

 side, not rooting at the apex. 



3. peruvianum, Klotzsch. Lvs. 1 ft. or more long, 

 on polished stipes ; with obliquely ovate pointed Ifts. 



2 in. long by \Yi in. wide, on slender stalks; son 8-10 

 on either side of the Ifts., twice as long as wide. Peru. 



4. macrophyllum, Swartz. Lvs. 1 ft. long, on rather 

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

 sessile Ifts. l}^-2 in. long by %-l in. wide; indusium 

 nearly continuous on either side of the 1ft. Trop. 

 Amer. 



5. Kaulfussii, Kunze. Lvs. 6-8 in. long, on slender 

 black stalks; Ifts. 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 

 Ifts. Mex., W. Indies. 



6. platyphyllum, Swartz. Lvs. 1-2 ft. long, stalks 

 black, glossy, If.-blades 6-12 in. long, 2-4 in. broad, 

 with a long terminal pinna and 3-6 pairs of lateral 

 pimur; lowest pinnae sometimes pinnately divided; 

 segm. 3-4 in. long, l}^-2 in. broad; sporangia in 

 nearly continuous line along the margin. Cent. Amer. 

 to Brazil and Bolivia. 



AAA. Lvs. at least bipinnate, the segms. twice as long as 

 broad, with the veinlets all springing from the lower 

 side. 



B. Lfts. 1 y-z-% in. long. 



7. trapeziffirme, Linn. Lvs. 18 in. or more long, with 

 the terminal 1ft. longer than the lateral; Ifts. trape- 

 zoidal, y-r-y^m.. wide, lobed, and with numerous sori. 



A. Sdnctae-Catharlnx is a form with deeper lobes. Trop. 

 Amer. 



BB. Lfts. smaller, an inch or less long. 

 c. Stalks polished, smooth. 



8. polyphyllum, Willd. Lvs. often tripinnate, with 

 stout black stalks; pinna; 6-8, long, with closely set Ifts. 

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

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



9. diaphanum, Blume (A. setulosum, J. Smith). Lvs. 

 simply pinnate or usually 2-pinnate at the base; Ifts. 

 J^in. long, %m. wide, with numerous sori placed in 

 the sinuses of the inner and outer edges. Asia to New 

 Zeal. 



10. afflne.Willd. Lvs. bipinnate, with a terminal pinna 

 and several lateral ones; Ifts. not exceeding %in. long, 

 y\\n. wide, the upper edge parallel with the lower, and 

 crenate, bearing numerous rounded sori on the upper 

 and outer margin. New Zeal. 



11. fulvum, Raoul. Lvs. 15-20 in. long, the stalks 

 erect, dark brown, shiny, rough below with long hairs; 

 the If.-blades 9-12 in. long, 6-8 in. broad, deltoid, 

 2-pinnate, the segm. %m. long, J^in. broad, dimidiate, 

 lower edge straight, the upper edge parallel with 

 sharp-tooth lobes; the sori uniform, numerous. New 

 Zeal. 



cc. Stalks polished but somewhat woolly. 



12. intermedium, Swartz. Lvs. 1 ft. or more long, 

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

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



upper and two-thirds 

 of the outer margins. 

 Trop. Amer. 



ccc. Stalks rough or 



hairy. 



13. form6sum,R. Br. 

 Lvs. 1-2 ft. long, two- 

 thirds as broad, mostly 

 tripinnate, with rough, 

 scabrous stalks and 

 rather small, deeply 

 lobed Ifts. %-% in. 

 long, with rounded and 

 toothed outer margins. 

 Austral. G. 20:769. 



14. pulverulentum, Linn. Lvs. often a foot long, with 

 a large terminal pinna and several lateral ones, bipin- 

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

 Ifts. y-\ in. long, }^in. wide, closely placed, the outer 

 edge rounded or truncate. W. Indies. 



15. vill&sum, Linn. (A. rhomboldeum, Swartz). Lvs. 

 large, with a terminal and several lateral pinnae 6-12 in. 

 long, on stout, villous-hairy stalks; Ifts. numerous, 

 nearly 1 in. long, }^in. wide, trapezoidal, with the inner 

 side parallel to the rachis; indusia forming an almost 

 continuous line along the upper and outer margins. W. 

 Indies and S. Amer. 



16. n&vse-caleddniae, Keys. Lvs. 6-8 in. long and 

 wide, somewhat pentagonal, once pinnate with one or 

 two secondary basal pinnse on the lower side at base; 

 Ifts. 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. 



AAAA. Lvs. forked, the two branches bearing pinnx from 



the upper side. 

 B. Stalks polished, smooth. 



17. pedatum, Linn. Fig. 120. COMMON MAIDENHAIR 

 of our northern states, with circular Ivs. on purplish 

 stalks 1 ft. or more high. Sometimes transplanted into 

 gardens, requiring a shady, moist and protected place. 

 G. 21:9. 



18. curvatum, Kaulf. Lvs. forked and with the main 

 divisions once or twice forked; Ifts. \-\Vi in. long, 



120. Fruiting pinnules of Adiantum 

 pedatum. (XI) 



