| 1 |
Veins dark brown to black (sometimes partially obscured by farina), stout, prominently raised abaxially; sori with 1(or 2) large sporangium with broad annuli |
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(2) |
| + |
Veins green (sometimes obscured by farina), slender, not or only slightly raised abaxially; sori consisting of (1 or)2 to several small sporangia with narrow annuli |
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(3) |
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| 2 (1) |
Lamina 7-10 cm; medial pinnae pinnatifid; false indusia interrupted. |
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1 A. grevilleoides |
| + |
Lamina 3.5-8 cm; medial pinnae bipinnatifid; false indusia continuous. |
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2 A. albofusca |
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| 3 (1) |
Lamina mostly pentagonal, nearly as wide as long; pinnae lobed to pinnatifid or only proximal 1-3 pairs of pinnae separated by wingless rachis; false indusia continuous, with entire or undulate margins |
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(4) |
| + |
Lamina triangular-ovate, oblong-lanceolate, or oblong; pinnae usually 5-10 pairs or more, separated from each other by wingless rachis; false indusia usually interrupted, rarely continuous |
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(16) |
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| 4 (3) |
Lamina moderately to densely scaly on surface and veins abaxially. |
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3 A. squamosa |
| + |
Lamina lacking scales abaxially or scaly only on rachis and costae |
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(5) |
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| 5 (4) |
Lamina glabrous, lacking farina abaxially |
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(6) |
| + |
Lamina with white or yellow farina abaxially (note that herbarium specimens dried with heat or treated with chemicals sometimes appear to lack farina and also rare hybrids involving farinose parental taxa sometimes do not produce farina) |
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(8) |
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| 6 (5) |
Pinnae curved upward; basal pinnae strongly inequilateral, acroscopic pinnules strongly reduced or lacking; lamina coarsely divided, ultimate segments falcate. |
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12 A. duclouxii |
| + |
Pinnae spreading or obliquely angled upward, moderately inequilateral, basal acroscopic pinnules developed, but shorter than basiscopic ones; lamina finely divided, ultimate segments relatively straight |
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(7) |
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| 7 (6) |
Second pair of pinnae (from lamina base) shorter than basal and third ones. |
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9 A. tamburii |
| + |
Second pair of pinnae (from lamina base) shorter than basal pair but longer than third ones. |
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11 A. argentea |
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| 8 (5) |
Lamina usually less than 5 cm, with snow-white farina abaxially; sori consisting of (1 or)2 or 3 sporangia, discrete |
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(9) |
| + |
Lamina usually more than 5 cm, with milky white or yellow farina abaxially; sori consisting of 3 to several sporangia, often confluent at maturity |
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(11) |
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| 9 (8) |
Laminae longer than stipes; stipes with scales and twisted hairs, these extending onto rachis and costae. |
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4 A. pygmaea |
| + |
Laminae shorter than stipes; stipes scaly only at base, not hairy; rachis and costae not hairy or scaly |
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(10) |
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| 10 (9) |
Lamina with basal pair of pinnae nearly equilateral, basal acroscopic segments lobed or pinnatifid, nearly as long as opposing basal basiscopic segments. |
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5 A. speciosa |
| + |
Lamina with basal pair of pinnae inequilateral, basal acroscopic segments simple, entire, much shorter than opposing basal basiscopic segments. |
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6 A. niphobola |
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| 11 (8) |
Scales of rhizome concolorous, dark brown to black |
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(12) |
| + |
Scales of rhizome bicolorous, with a brown to black central stripe and lighter margins |
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(13) |
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| 12 (11) |
Lamina with white farina abaxially and with relatively dense red glands (actually farina-producing glands with a red apical cell). |
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7 A. likiangensis |
| + |
Lamina with milky yellow farina abaxially, lacking red glands or some farina-producing glands with apical cell light brown, rarely somewhat reddish tinged. |
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8 A. veitchii |
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| 13 (11) |
Lamina with light yellow to lemon-yellow farina abaxially. |
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12 A. duclouxii |
| + |
Lamina with white farina abaxially |
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(14) |
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| 14 (13) |
Second pair of pinnae (from lamina base) shorter than basal pair but longer than third ones. |
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11 A. argentea |
| + |
Second pair of pinnae (from lamina base) shorter than basal and third ones |
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(15) |
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| 15 (14) |
Medial pinnae rounded or bluntly pointed at tips; distal lobes of pinnae oblong, oblong-triangular, or nearly semicircular, with narrow V-shaped sinuses between lobes. |
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9 A. tamburii |
| + |
Medial pinnae attenuate at tips; distal lobes of pinnae linear to narrowly oblong, with broad U-shaped sinuses between lobes. |
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10 A. yalungensis |
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| 16 (3) |
Lamina lacking farina at maturity (young fronds sometimes farinose) |
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(17) |
| + |
Lamina with white or yellow farina abaxially |
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(19) |
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| 17 (16) |
False indusia continuous, margins undulate; lamina hairy abaxially. |
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28 A. subvillosa |
| + |
False indusia interrupted, margins laciniate; lamina glandular abaxially or glabrous except for inconspicuous hairs at pinna bases |
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(18) |
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| 18 (17) |
Fronds (15-)25-40 cm; stipe terete; lamina glabrous abaxially or occasionally sparsely and inconspicuously hairy at pinna bases. |
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26 A. leptolepis |
| + |
Fronds 7.5-15 cm; stipe grooved distally; lamina with brown glands along costae and veins abaxially. |
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27 A. duthiei |
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| 19 (16) |
Stipe with short, dark brown glands. |
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13 A. sichouensis |
| + |
Stipe not glandular, but often scaly, occasionally also hairy |
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(20) |
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| 20 (19) |
Stipe, rachis, and costae scaly |
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(21) |
| + |
Stipe scaly at base, sometimes up to rachis, but scales not extending to costae |
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(23) |
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| 21 (20) |
Scales on stipe broadly lanceolate, distinctly bicolorous, with conspicuous pale margins. |
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23 A. albomarginata |
| + |
Scales on stipe narrowly lanceolate, reddish brown, concolorous or mixed with occasional scales having narrow, lighter margins |
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(22) |
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| 22 (21) |
Lamina glabrous or rarely sparsely hairy adaxially; lamina widest at base. |
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24 A. dubia |
| + |
Lamina sparsely hairy and with sparse slender scales adaxially; lamina usually widest above base. |
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25 A. rufa |
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| 23 (20) |
Lamina with milky yellow or golden-yellow farina abaxially |
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(24) |
| + |
Lamina with white farina abaxially |
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(26) |
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| 24 (23) |
Stipe black, basalmost stipe scales black, slightly bicolorous, with very narrow, brown margins. |
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14 A. ebenipes |
| + |
Stipe usually reddish brown to dark brown, basalmost stipe scales concolorous, reddish brown |
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(25) |
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| 25 (24) |
Lamina with golden-yellow farina abaxially; stipe scales linear-lanceolate. |
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15 A. chrysophylla |
| + |
Lamina with milky yellow farina abaxially; stipe scales broadly lanceolate. |
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16 A. krameri |
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| 26 (23) |
Stipe and rachis densely scaly. |
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17 A. formosana |
| + |
Stipe scaly proximally, rachis not scaly (occasionally sparsely scaly at base in A. anceps) |
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(27) |
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| 27 (26) |
Rhizome scales brown, ovate-lanceolate, thin and translucent |
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(28) |
| + |
Rhizome scales black, lanceolate, relatively thick and opaque |
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(29) |
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| 28 (27) |
Lamina hairy along costae and veins. |
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28 A. subvillosa |
| + |
Lamina lacking hairs. |
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29 A. kuhnii |
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| 29 (27) |
Rhizome scales concolorous. |
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18 A. gongshanensis |
| + |
Rhizome scales bicolorous |
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(30) |
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| 30 (29) |
False indusia poorly developed to nearly absent. |
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19 A. dealbata |
| + |
False indusia well developed |
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(31) |
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| 31 (30) |
False indusia interrupted, with laciniate margins. |
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20 A. anceps |
| + |
False indusia continuous or sometimes interrupted, margins entire or undulate |
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(32) |
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| 32 (31) |
Lamina 2-6 cm, thinly herbaceous; false indusia poorly developed, narrow; stipe scales linear-lanceolate. |
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21 A. rosulata |
| + |
Lamina (3-)10-20 cm, leathery; false indusia well developed, broad; stipe scales broadly lanceolate. |
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22 A. grisea |
