=A. trapeziforme= (rhomb-leaved).* _sti._ 6in. to 12in. long, firm, erect. _fronds_ 12in. to 24in. long, with a central pinna 4in. to 8in. long, 2in. to 3in. broad, and two to four large spreading ones on each side, the lowest of which are often branched again; segments 1-1/2in. to 2in. long, 1/2in. to 3/4in. broad, dimidiate, the sides nearly parallel, the outer edge oblique, both it and the upper one bluntly lobed, the lowest on stalks 1/4in. to 1/2in. long. _sori_ numerous, contiguous, placed round the upper and outer edge. West Indies, 1793. Stove species.
=A. t. cultratum= (sharpened).* Outer edge of the segment bluntly rounded.
=A. t. pentadactylon= (five-fingered). Lower margin of the segments somewhat decurved obliquely from the petiole.
=A. t. Sanctæ Catherinæ= (of gardens).* This is a deeply cut, rather copiously divided variety of _A. trapeziforme_.
=A. t. S. C. Funcki= (Funck's).* A deeply lobed, drooping variety, of garden origin.
=A. triangulatum= (triangle-leaved). Synonymous with _A. intermedium_.
=A. varium= (various). Probably identical with _A. villosum_.
=A. Veitchianum= (Veitch's).* _sti._ 6in. to 9in. long. _fronds_ 9in. to 18in. long, deltoid, bipinnate in lower half, reddish when young; side pinnules rhomboid, about 1/2in. long, lower border straight, more or less deflexed from tip of pedicel, inner distant from rachis, upper and outer shallowly lobed; end segments 1/2in. to 3/4in. broad, equilateral, rounded in upper, deltoid in lower half. _sori_ eight to ten to a segment, round, minute. Peruvian Andes, 1868. A very elegant and distinct stove species.
=A. velutinum= (velvety).* _sti._ as long as fronds, slightly velvety. _fronds_ deltoid, 1-1/2ft. to 2ft. long, three to four pinnate; rachises densely pubescent on both sides; pinnæ 6in. to 9in. long; segments twenty to thirty-jugate, sub-sessile, sub-rhomboidal, 1in. long, 1/2in. broad, lower border decurved, outer blunt or sub-acute, upper straight, shallowly, bluntly lobed. _sori_ straight, one to one and a half lines long at tips of lobes of upper edge, four to six to a segment. Columbia, 1866. A magnificent stove species.
=A. venustum= (charming).* _sti._ 6in. to 9in. long, wiry, erect, glossy. _fronds_ 6in. to 12in. long, 4in. to 8in. broad, deltoid, tri-quadripinnate; ultimate segments about 1/4in. across, cuneate at the base, the upper edge rounded, and usually finely toothed, of a light green colour, with a firm texture. _sori_ one to three, roundish; in hollows of the upper edge. Himalayas, up to 8000ft. Greenhouse or frame, nearly hardy in sheltered places. SYN. _A. microphyllum_.