1	Rhizome slender and long creeping; lamina herbaceous, rather thin and usually soft; axes and main veins adaxially with pale gray unicellular acicular hairs		(2)
+	Rhizome usually stout, creeping to ascending, or erect; lamina papery to leathery, or rarely herbaceous especially when young; axes and main veins adaxially glabrescent or with scales, but not unicellular hairs		(4)
2 (1)	Indusium entire; main veins abaxially with broadly ovate and bullate-based scales; stipe and primary rachis with copious scales.		1 A. miqueliana
+	Indusium ciliate or entire; main veins abaxially with narrowly lanceolate, or hairlike and flat-based scales; upper part of stipe and primary rachis glabrescent		(3)
3 (2)	Lamina pentagonal, 4(or 5)-pinnate, upper parts conspicuously abruptly narrowed toward apex and acuminate, brownish green when dried.		2 A. quadripinnata
+	Lamina deltoid-pentagonal, 3-pinnate-pinnatifid, upper parts long acuminate, yellowish green when dried.		3 A. sinomiqueliana
4 (1)	Lamina 4- or 5-pinnate, ultimate segments very narrowly lanceolate, with a single vein; sori solitary in each segment; indusia very firm, dark and entire, covering sorus when young and splitting into irregular segments when mature.		4 A. superba
+	Lamina usually 2-4(or 5)-pinnate, rarely simply pinnate, ultimate segments asymmetrically oblong or rhomboid, with more than one vein; sori often more than one in each segment; indusia membranous, papery or firm, persistent or fugacious, margin entire or erose		(5)
5 (4)	Lamina oblong-lanceolate, simply pinnate; pinnae lanceolate; free ultimate segments (pinnae) nearly symmetrically cuneate at base		(6)
+	Lamina deltoid, ovate, or pentagonal, 2-4(or 5)-pinnate; pinnae usually deltoid or ovate-lanceolate; free ultimate segments usually asymmetrical at base with acroscopic auricles		(8)
6 (5)	Stipe with dark brown scales at base; pinnae rachis abaxially with sparse hairlike scales; sori mostly dorsal at or below middle of veinlets.		5 A. neopodophylla
+	Stipe with reddish brown scales at base; pinnae rachis abaxially glabrescent; sori terminal or subterminal on veinlets		(7)
7 (6)	Lamina acuminate at apex or with a distinct terminal pinna; pinnae with aristate-tipped cartilaginous coarse teeth on margin.		6 A. blinii
+	Lamina with a distinct terminal pinna; pinnae with non-aristate-tipped crenulate teeth on margin.		7 A. tsiangiana
8 (5)	Sori dorsal on veinlets; ultimate segments with margin dentate or acutely serrate, never with aristate tips; texture thickly leathery.		8 A. cavaleriei
+	Sori terminal on veinlets (or subdorsal but mixed with terminal ones on same lamina); ultimate segments with margin acutely dentate or pinnatilobate, teeth with or without aristate tips; texture papery, subleathery, or herbaceous		(9)
9 (8)	Rhizome and base of stipe with shiny castaneous, ovate-lanceolate, and stiffly thickly papery scales; stipe upward and rachis throughout glabrescent and glossy		(10)
+	Rhizome and base of stipe with blackish, grayish, or reddish brown, ovate-lanceolate, lanceolate, linear-lanceolate, or filiform, and membranous or thinly papery scales; stipe upward and rachis throughout ?scaly and often not glossy		(11)
10 (9)	Lamina caudate toward apex, and with a distinct terminal pinna; lateral pinnae also caudate at apices.		9 A. amoena
+	Lamina abruptly narrowed toward apex and caudate-acuminate, without distinct terminal pinna; lateral pinnae also caudate-acuminate at apices.		10 A. tonkinensis
11 (9)	Rhizome ascending, with tufted, reddish brown, long, tortuous, filiform scales extending to stipe base		(12)
+	Rhizome long to shortly creeping or ascending, often bearing grayish or blackish brown, linear-lanceolate, ovate-lanceolate, or subulate scales extending to stipe base		(16)
12 (11)	Lamina 2-pinnate-pinnatifid, free ultimate segments 5-8 ?ca. 1.5 cm		(13)
+	Lamina 3-5-pinnate, free ultimate segments at most to 2 ?1 cm		(14)
13 (12)	Stipe base with only long hairlike scales; lamina leathery, lustrous and brownish when dried.		11 A. grossa
+	Stipe base with broad, denticulate-margined scales and with hairlike scales adaxially; lamina papery, dull dark green when dried.		12 A. fengii
14 (12)	Fronds large, usually reaching ca. 1.7 m; lamina 5-pinnate; stipe with both subulate scales and broadly lanceolate, denticulate-margined thicker scales along both sides of adaxial groove at lower part above base.		15 A. gigantea
+	Fronds medium-sized, at most to 1.5 m; lamina 3- or 4-pinnate; stipe with scales similar to those on rhizome or bearing slightly wider scales along both sides of adaxial groove near base		(15)
15 (14)	Lamina papery, 3- or 4-pinnate; ultimate segments obviously separate from each other, apex and lobes mucronate, dull brownish when dried; indusia usually denticulate on margin.		13 A. globisora
+	Lamina thinly leathery, 4-pinnate; ultimate segments contiguous to imbricate, apex and lobes with non-aristate sharp teeth, shiny green when dried; indusia often entire on margin.		14 A. spectabilis
16 (11)	Rhizome lignified, together with base of stipe bearing linear-lanceolate, lanceolate, or subulate, and thicker and firmer scales		(17)
+	Rhizome succulent, especially at growing apex, bearing broadly lanceolate or ovate-lanceolate and more delicate scales extending to stipe base		(28)
17 (16)	Fronds dimorphic; fertile lamina strongly contracted with much shorter and narrower pinnae and pinnules.		16 A. hainanensis
+	Fronds monomorphic, or with minor differences between fertile and sterile laminae (or pinnae on same lamina)		(18)
18 (17)	Lamina abruptly acuminate to caudate-acuminate toward apex, most often with a conform terminal pinna resembling lateral pinnae		(19)
+	Lamina gradually acuminate to strongly acuminate, gradually reduced without a conform terminal pinna		(21)
19 (18)	Lamina 2- or 3-pinnate, with an elongated caudate-acuminate apex, lateral pinnae often linear-lanceolate (only lowest pinnae deltoid-lanceolate).		19 A. longipinna
+	Lamina (2 or)3- or 4-pinnate, with a distinct terminal pinna resembling adjacent lateral pinnae, lower 2-4 pairs of pinnae often deltoid-lanceolate with long basal basiscopic pinnules		(20)
20 (19)	Lamina relatively smaller and less dissected when mature, (2 or)3-pinnate, lower pinnae proximally with 1 or 2 pairs of elongated and 1-pinnate pinnules.		17 A. simplicior
+	Lamina relatively larger and more dissected, 4-pinnate at base, lower pinnae proximally with 2 or 3 pairs of elongated and 1- or 2-pinnate pinnules.		18 A. ziyunshanensis
21 (18)	Lamina 2- or 3-pinnate; stipe bearing brown or dark brown, linear-lanceolate to subulate, denticulate-based, appressed scales above base and rachis throughout		(22)
+	Lamina (3 or)4(or 5)-pinnate; stipe bearing brown or coal-black, linear-lanceolate (or wider but often entire-margined) spreading scales above base and rachis throughout, or stipe glabrescent		(25)
22 (21)	Lamina caudate-acuminate at apex; lower pinnae with basally elongated pinnules		(23)
+	Lamina acuminate to shortly acuminate at apex; pinnae (except basal) often without basally elongated pinnules		(24)
23 (22)	Rhizome long creeping; lamina shiny brownish green when dried; sori medial on veinlets.		20 A. aristata
+	Rhizome shortly creeping; lamina dull greenish when dried; sori medial or more basal on veinlets.		22 A. jinpingensis
24 (22)	Lamina acuminate to attenuate at apex, occasionally abruptly narrowed; lateral pinnae often with basal pinnules longest.		21 A. chinensis
+	Lamina acuminate at apex; lateral pinnae with basal pinnules as long as or shorter than adjacent upper ones.		23 A. japonica
25 (21)	Lamina subleathery, stiff or firm when dried		(26)
+	Lamina thinly herbaceous, soft and tenuous when dried		(27)
26 (25)	Lamina thickly papery to subleathery when mature; ultimate segments broader and with aristate or mucronate teeth.		24 A. speciosa
+	Lamina papery or thinly papery when mature; ultimate segments often narrower and with only sharply tipped (but non-aristate) teeth.		25 A. coniifolia
27 (25)	Stipe above base and rachis throughout bearing sparse, dull brown, relatively thinner scales, or glabrescent.		26 A. festina
+	Stipe above base and rachis throughout bearing a number of coal-black and relatively thicker scales.		27 A. nigrospinosa
28 (16)	Lamina abruptly caudate at apex and forming a conform linear terminal pinna		(29)
+	Lamina toward apex acuminate, attenuate, or abruptly narrowed but acute, or forming a broadly acuminate terminal pinna		(31)
29 (28)	Sori marginal or submarginal; indusia margin ciliate at least when young.		28 A. amabilis
+	Sori medial; indusia margin entire		(30)
30 (29)	Pinnae strongly ascending (forming an angle of less than 30?with rachis), lower 3 or 4 pairs similar in shape and size; ultimate segment margin serrate; indusia with hairs on dorsal surface.		30 A. similis
+	Pinnae obliquely spreading (forming an angle of more than 60?with rachis), pinnae gradually reduced toward lamina apex (and sometimes lowest pair of pinnae with long basal basiscopic pinnules); proximal ultimate segments on acroscopic or both margins often shallowly pinnate; indusia glabrous.		29 A. hekiana
31 (28)	Lamina 2-pinnate; ultimate segments often broader than 1 cm		(32)
+	Lamina 2-pinnate-pinnatifid to usually 3- or 4(or 5)-pinnate; ultimate segments often narrower than 1 cm		(35)
32 (31)	Lamina gradually acuminate toward apex		(33)
+	Lamina abruptly narrowed toward apex, with a distinct but acuminate terminal pinna		(34)
33 (32)	Lamina as long as or shorter than stipe, deltoid-oblong, with a terminal pinna resembling or slightly wider than its lateral ones; ultimate segments not decurrent.		31 A. assamica
+	Lamina longer than stipe, often oblong, its 1-pinnate apex much longer and wider than lateral pinnae; ultimate segments decurrent.		32 A. yoshinagae
34 (32)	Stipe ochraceous; lamina papery, brownish green when dried; lateral pinnae broader than 5 cm.		33 A. pseudoassamica
+	Stipe stramineous; lamina thinly papery, yellowish green when dried; lateral pinnae narrower than 4 cm.		34 A. wulingshanensis
35 (31)	Lamina abruptly narrowed toward apex and long acuminate or acute; lowest pinnae linear-lanceolate to lanceolate or basal 1(or 2) pairs of pinnules obviously elongated		(36)
+	Lamina acuminate or slightly attenuate at apex; lowest pinnae deltoid or ovate and often much broader, with basal basiscopic pinnules slightly longer		(37)
36 (35)	Lamina 2-pinnate-pinnatifid; lateral pinnae linear-lanceolate or lanceolate; ultimate segments often deeply pinnatifid.		35 A. hunanensis
+	Lamina 3-pinnate; lower 3(or 4) pinnae deltoid with elongated basal pinnules; ultimate segments (except proximal ones) sharply serrate.		36 A. sinorhomboidea
37 (35)	Lamina thickly papery or subleathery, most often 3-pinnate; ultimate segments usually broader than 5 mm		(38)
+	Lamina herbaceous or papery, most often 4-pinnate; ultimate segments usually narrower than 5 mm		(39)
38 (37)	Pinnules remote; lamina papery and often flexible, shiny yellowish green when dried; veins and costules with brown, appressed articulate hairs abaxially.		37 A. nipponica
+	Pinnules contiguous; lamina subleathery and often firm, pale greenish when dried; veins and costules glabrescent abaxially.		38 A. ailaoshanensis
39 (37)	Ultimate segments with aristate-tipped teeth; indusia ciliate or erose; lamina firmly herbaceous or papery, often dull pale green when dried.		39 A. simulans
+	Ultimate segments with blunt-tipped teeth; indusia entire; lamina thinly herbaceous, often shiny green when dried.		40 A. henryi