37. ADIANTUM. § 1. ElJ-ADIANTUM. b. OLIGOSORIAE. 32l 



* (2) A. macrophyllum, Sw., Hk. Bk., Syn. Fil, 121; Hk., Pil. 

 Exot., tab. LV; Hk. & Grev., Ic. Fil., tab. CXXXII ; — var. striatum, Hort. Bog. 



Stipes 15—30 c.M. long, firm, erect, polished, naked, blackish. Fronds 

 20^40 c.M. long, 10—20 c.M. broad, simply pinnate with + 4—6 pairs of 

 ± opposite lateral pinnae below the terminal one. Lower pinnae (leaflets) 

 of the barren fronds 7—10 c.M. long, + 5 c.M. broad, so broad at the base 

 that the opposite ones frequently overlap; all the pinnae sessile or the lower 

 ones very short-stalked, inequilateral, but not dimidiate, the margin rather 

 distinctly lobed; fertile pinnae narrower than the barren ones. Texture 

 flaccido-papyraceous. Sori linear, in long-continuous or interrupted marginal 

 lines. — Occasionally this well-known species becomes 2-pinnate in the lower 

 part. The young fronds are often beautifully tinged with red. 



^ar. striatum : Beautifully variegated with long or short, broad or 

 ilarrow, white stripes placed irregularly between or along the veins. 



Much cultivated. — Orig. he: Trop. America. 



(3) A. platypbyllum, ««?., C. Ghr., Ind. Fil.; A. Seemanni, Hk., 

 Hk. Bk., Syn. Pil., 121; Hk., Spec. Fil., II, tab. LXXXI, A. 



Stipes 1.1 — 25 c.M. long, erect, blackish, polished. Fronds IS — 30 c.M. 

 long, i — 2 X pinnate. Leaflets 7—10 c.M. long, S'/a — S c.M. broad, ovate, 

 acuminate, rather unequal-sided, but not dimidiate, the barren ones finely 

 serrate, one side usually cordate at the base, the other obliquely truncate; 

 petioles of the lowest leaflets nearly 2^/2 c.M. long. Texture subcoriaceous ; veins 

 prominent; rachis naked, polished. Sori in long, continuous, marginal lines, 

 often accompanied by roundish or oblong ones. — Resembles A. peruvianum, 

 Kl. in habit. 



In cultivation. — Orig. he: Centr. America,^ Brazil^ Bolivia. 



% 1. EU-ADiANTUM. c. Polysoriac. 



u. Fronds i — 2 X pinnate. 



h. Sori few, typically i — 2 to a leaflet. 



>(c. Fronds simply pinnate. Indusium narrow. (4) A. gomphophyllum. 

 ;(c.:H«. Fronds 2-pinnate. Indusium broad. (B) A. Hosei. 



b.b. Sori rriany, typically 3 or more to a leaflet. 



c. Surfaces pilose or strigose at least on the veins. 



$. Texture thinly herbaceous or membranaceous. (6) A. diaphanum. 

 S.S. Texture chartaceous or coriaceous. 



