| 1 |
All fronds simple, linear, lanceolate, or ovate |
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(2) |
| + |
At least some fronds deeply lobed, hastately divided, palmately parted, pinnately parted, or pinnatisect |
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(18) |
| |
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| 2 (1) |
Sori linear, between and parallel to adjacent lateral veins. |
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48 S. feei |
| + |
Sori orbicular or less often elliptic, very rarely confluent |
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(3) |
| |
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| 3 (2) |
Fronds moderately dimorphic; sterile lamina ovate, fertile lamina narrower, linear or ovate-lanceolate |
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(4) |
| + |
Fronds monomorphic; lamina oblong, ovate, or linear |
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(5) |
| |
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| 4 (3) |
Soriferous portion not or slightly contracted; sori orbicular, separate. |
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1 S. rhynchophylla |
| + |
Soriferous portion much contracted, linear; sori elongate or confluent in upper part of frond. |
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2 S. wuliangshanense |
| |
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| 5 (3) |
Margin notched |
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(6) |
| + |
Margin entire or undulate |
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(12) |
| |
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|
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| 6 (5) |
Sori sunken on abaxial surface and raised on adaxial surface. |
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9 S. yakushimensis |
| + |
Sori superficial |
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(7) |
| |
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| 7 (6) |
Lamina base truncate or cordate, or if rounded then lamina 3-6 cm wide, marginal notches sometimes indistinct |
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(8) |
| + |
Lamina base cuneate to rounded, if rounded then lamina 0.5-2 cm wide |
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(9) |
| |
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| 8 (7) |
Lamina 5-15 ?2-3 cm, base cordate, apex obtuse or acute. |
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5 S. oblongifolia |
| + |
Lamina 15-25 ?3-6 cm, base rounded or truncate, apex shortly acuminate. |
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7 S. majoensis |
| |
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|
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| 9 (7) |
Lamina 5-7 mm wide, herbaceous. |
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12 S. tenuipes |
| + |
Lamina 10-30 mm wide, papery to leathery, less often herbaceous |
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(10) |
| |
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| 10 (9) |
Lamina base cuneate, margin indistinctly notched, apex shortly acuminate. |
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11 S. engleri |
| + |
Lamina base broadly cuneate or rounded, margin notched, apex acute or obtuse |
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(11) |
| |
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| 11 (10) |
Lamina leathery, stipe thick. |
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13 S. omeiensis |
| + |
Lamina papery or herbaceous, stipe slender. |
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15 S. hastata |
| |
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| 12 (5) |
Lamina apex rounded, obtuse, or acute |
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(13) |
| + |
Lamina apex acuminate or caudate |
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(14) |
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| 13 (12) |
Lamina margin entire or undulate; rhizome scales brown, margin entire. |
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4 S. obtusa |
| + |
Lamina margin notched; rhizome scales reddish brown, margin sparsely toothed. |
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5 S. oblongifolia |
| |
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| 14 (12) |
Rhizome sparsely scaly, surface with whitish bloom; lamina margin wide, flat, translucent. |
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3 S. chrysotricha |
| + |
Rhizome densely scaly, surface not visible; lamina margin narrow, thickened, not translucent |
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(15) |
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| 15 (14) |
Lamina 30-35 cm, thin, pellucid; veinlets distinct. |
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10 S. pellucidifolia |
| + |
Lamina 8-25 cm, papery to leathery, opaque; veinlets obscure |
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(16) |
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| 16 (15) |
Lamina 1.5-3 cm wide, papery, base gradually narrowed; sori medial. |
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6 S. hainanensis |
| + |
Lamina 3-6 cm wide, leathery, base truncate, rounded, or broadly cuneate; sori close to midrib |
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(17) |
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| 17 (16) |
Lamina base truncate or rounded, abaxial surface glaucous. |
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7 S. majoensis |
| + |
Lamina base broadly cuneate, abaxial surface yellowish green. |
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8 S. griffithiana |
| |
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| 18 (1) |
Divided fronds at most hastate, with 2 basal lateral lobes |
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(19) |
| + |
At least some divided fronds palmate with more than 2 lateral lobes or pinnately divided |
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(20) |
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| 19 (18) |
Lamina margin entire or remotely notched; sori slightly sunken abaxially; scales yellowish brown. |
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14 S. taiwanensis |
| + |
Lamina margin regularly notched; sori superficial; scales reddish brown. |
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15 S. hastata |
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| 20 (18) |
Fronds palmately divided with 4-6 lobes (S. dactylina s.l.) |
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(21) |
| + |
Fronds pinnately divided, lateral lobes/pinnae 1-10 pairs |
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(23) |
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| 21 (20) |
Stipe castaneous, scaly at base; plants 5-10 cm high, lamina 5-9 ?5-9 cm. |
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16 S. digitata |
| + |
Stipe straw-colored, glabrous; plants 20-30 cm high, lamina 10-20 ?10-15 cm |
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(22) |
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| 22 (21) |
Scales narrowly lanceolate, yellowish brown, 5-7 mm, gradually narrowed from peltate base to acuminate apex. |
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17 S. dactylina |
| + |
Scales ovate, dark brown, ca. 10 mm, gradually or sometimes abruptly narrowed into long hairlike apex. |
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18 S. chenopus |
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| 23 (20) |
Lamina margin entire |
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(24) |
| + |
Lamina margin notched or toothed |
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(26) |
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| 24 (23) |
Fronds pubescent; lateral lobes 1-3 pairs, apical lobe distinctly larger than lateral lobes. |
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19 S. trisecta |
| + |
Fronds glabrous; lateral lobes 1-5(-8) pairs, apical lobe similar to lateral lobes |
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(25) |
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| 25 (24) |
Fronds pinnatifid at base, lobes triangular or broadly lanceolate. |
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20 S. oxyloba |
| + |
Fronds pinnatisect at base, pinnae ovate-lanceolate. |
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21 S. likiangensis |
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| 26 (23) |
Lamina margin with notches regularly placed between veins, sometimes sparse (S. kingpingensis) |
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(27) |
| + |
Lamina margin usually with a sharp tooth below each notch, often with additional teeth between each pair of notches, or ?uniformly serrate and not notched |
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(39) |
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| 27 (26) |
Fronds distinctly dimorphic; sori deeply sunken. |
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22 S. trilobus |
| + |
Fronds monomorphic; sori superficial |
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(28) |
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| 28 (27) |
Lateral lobes 1 or 2 pairs, deltoid or subdeltoid; basal lobes spreading in trilobate lamina. |
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23 S. cruciformis |
| + |
Lateral lobes 2-8 pairs, lanceolate; basal lobes ascending or deflexed |
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(29) |
| |
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| 29 (28) |
Lateral lobes all ascending, lamina cuneate or rounded at base |
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(30) |
| + |
Lowest lobes deflexed or slightly deflexed, occasionally patent, lamina cordate or truncate at base |
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(34) |
| |
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| 30 (29) |
Fronds hairy throughout; terrestrial. |
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24 S. hirtella |
| + |
Fronds glabrous; epiphytic |
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(31) |
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| 31 (30) |
Fronds 25-50 cm; stipe usually longer than lamina. |
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25 S. taeniata |
| + |
Fronds 10-20 cm; stipe shorter than lamina |
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(32) |
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| 32 (31) |
Scales black with whitish cilia at margin. |
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26 S. kingpingensis |
| + |
Scales yellowish brown or whitish, with or without ciliate margin |
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(33) |
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| 33 (32) |
Scales yellowish brown with entire margin; sori medial. |
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27 S. connexa |
| + |
Scales whitish with ciliate margin; sori close to margin. |
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28 S. daweishanensis |
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| 34 (29) |
Scales ovate, castaneous to black; abaxial side of lamina usually sparsely scaly especially on midrib and veins. |
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29 S. ebenipes |
| + |
Scales lanceolate, brown to whitish; abaxial side of lamina without scales |
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(35) |
| |
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| 35 (34) |
Scales with broad whitish or light brown margin, or dark brown when older |
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(36) |
| + |
Scales brown or dark brown |
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(37) |
| |
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| 36 (35) |
Lamina glabrous on both surfaces; lobes acuminate at apex. |
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32 S. albipes |
| + |
Lamina pubescent on both surfaces; lobes obtuse at apex. |
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33 S. pianmaensis |
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| 37 (35) |
Rhizome 8-12 mm in diam.; scale margins entire; sori sunken and medial or closer to margin. |
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30 S. echinospora |
| + |
Rhizome 2-4 mm in diam.; scale margins ciliate; sori superficial, ?close to costa |
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(38) |
| |
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| 38 (37) |
Lateral lobes 2-5 pairs, adaxially glabrous. |
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31 S. quasidivaricata |
| + |
Lateral lobes 4-7 pairs, adaxially pubescent. |
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35 S. incisocrenata |
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| 39 (26) |
Fronds pubescent on one or both surfaces. |
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34 S. nigrovenia |
| + |
Fronds glabrous on both surfaces |
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(40) |
| |
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| 40 (39) |
Lateral lobes obtuse or acute at apex |
|
(41) |
| + |
Lateral lobes acuminate or caudate-acuminate at apex |
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(44) |
| |
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| 41 (40) |
Lamina 5-8 cm; stipe straw-colored or dark straw-colored at base. |
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36 S. senanensis |
| + |
Lamina 5-20 cm; stipe purple or castaneous at base |
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(42) |
| |
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| 42 (41) |
Lobes shallowly crenate to pinnately lobed. |
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37 S. crenatopinnata |
| + |
Lobes densely serrulate or duplicate-serrate at margin |
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(43) |
| |
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| 43 (42) |
Lateral lobes ovate-lanceolate, constricted at base. |
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38 S. glaucopsis |
| + |
Lateral lobes linear. |
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39 S. conmixta |
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| 44 (40) |
Lowest lobes of lamina deflexed |
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(45) |
| + |
Lowest lobes of lamina ascending |
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(46) |
| |
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| 45 (44) |
Lateral lobes gradually narrowed from base to apex. |
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40 S. stracheyi |
| + |
Lateral lobes ovate-lanceolate, slightly constricted at base. |
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41 S. conjuncta |
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| 46 (44) |
Scales black without light margin but with whitish cilia on margin |
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(47) |
| + |
Scales brown or dark brown or with a black center, with distinct, lighter, dentate or ciliate margin |
|
(49) |
| |
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| 47 (46) |
Lobes obtusely serrate at margin. |
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42 S. stewartii |
| + |
Lobes sharply serrate at margin |
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(48) |
| |
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| 48 (47) |
Lamina with 4-9 pairs of lateral pinnae, cartilaginous margin straw-colored. |
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43 S. nigropaleacea |
| + |
Lamina with 2 or 3 pairs of lateral lobes, cartilaginous margin reddish. |
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44 S. roseomarginata |
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| 49 (46) |
Scales dark brown or castaneous; lateral veins ending in margin. |
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45 S. tibetana |
| + |
Scales brown; lateral veins not ending in margin |
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(50) |
| |
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|
| 50 (49) |
Marginal teeth sharply acute. |
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46 S. malacodon |
| + |
Marginal teeth up to 2 mm aristate. |
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47 S. albidoglauca |
