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19. Polystichum sect. Sphaenopolystichum Ching ex W. M. Chu & Z. R. He, Fl. Reipubl. Popularis Sin. 5(2): 223. 2001.
细裂耳蕨组 xi lie er jue zu
Plants small to medium-sized, evergreen. Frond texture papery, thinly papery, or rarely thinly leathery. Stipe scales uniform, ovate to lanceolate, often appressed, rarely spreading. Lamina lanceolate, broadly lanceolate, ovate-lanceolate, or ovate, often bipinnatifid to bipinnatipartite, bipinnatisect, tripinnatifid, rarely tetrapinnatifid. Ultimate lobes often narrow, linear to spatulate, entire, with 1 veinlet per lobe. Sori 1 per lobe or ultimate lobe, small, abaxial or terminal on veinlets. Indusia falling off early or sori without indusia.
About 12 species: China, India, Myanmar, and Vietnam; 12 species (nine endemic) in China.
Polystichum sect. Sphaenopolystichum is recognized here based on morphology.
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| 1 |
Scales on stipe and rachis open |
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(2) |
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Scales on stipe and rachis all or mostly appressed |
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(4) |
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| 2 (1) |
Lamina tripinnate to tetrapinnatifid; stipe scales dense, up to 10 ?5 mm, reddish brown. |
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144 P. wattii |
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Lamina bipinnatipartite to bipinnatisect, or lamina base bipinnate; stipe scales sparse, shorter than 2 mm, brown |
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(3) |
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| 3 (2) |
Lamina elliptic-lanceolate, green. |
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145 P. martinii |
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Lamina deltoid-lanceolate, dark green. |
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146 P. cuneatiforme |
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| 4 (1) |
Lamina tripinnate or tetrapinnate; ultimate lobes linear |
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(5) |
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Lamina 1-pinnate to bipinnate; ultimate lobes not linear |
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(6) |
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| 5 (4) |
Lamina narrowly elliptic or broadly elliptic-lanceolate, middle or upward broadest; pinnae approximate, up to 40 pairs, yellowish green, those below middle or above middle narrowed gradually toward lamina base; rachis scales narrowly lanceolate; pinna rachis stramineous or greenish stramineous; sori indusiate. |
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135 P. caruifolium |
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Lamina narrowly ovate, broadest below middle; pinnae often separate from each other, fewer than 25 pairs, dark green, those below middle not or only slightly narrowed toward lamina base; rachis scales broadly ovate; pinna rachis green; sori exindusiate. |
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136 P. alcicorne |
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| 6 (4) |
Lamina 1-pinnate; pinnae pinnatilobed to pinnatipartite |
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(7) |
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Lamina bipinnate; pinnules toothed or pinnatilobed to pinnatipartite |
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(9) |
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| 7 (6) |
Upper side of pinnae pinnatipartite to pinnatisect and often forming 1 or few free lobes. |
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141 P. auriculum |
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Upper side of pinnae pinnatifid only and without free lobes |
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(8) |
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| 8 (7) |
Pinnae 30-40 pairs, only a few basalmost pinnae slightly narrowed. |
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142 P. bifidum |
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Pinnae 15-23 pairs, those below middle of lamina gradually narrowed toward lamina base. |
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143 P. pseudolanceolatum |
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| 9 (6) |
Lamina elliptic-lanceolate, 5-9 cm at widest (at middle); pinnae asymmetrical at base; pinnules toothed or pinnatifid to pinnatipartite, narrowly cuneate, basal acroscopic ones largest and slightly auriculate |
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(10) |
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Lamina ovate or ovate-lanceolate, (7-)10-23 cm at widest (below middle); pinnae symmetrical or nearly symmetrical at base; pinnules pinnatilobed to pinnatifid, rarely pinnatipartite, broadly cuneate, basal acroscopic ones same size as others; ultimate lobes ovate-deltoid, rarely clavate-oblong |
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(11) |
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| 10 (9) |
Pinnules pinnatifid to pinnatipartite; ultimate lobes elliptic-clavate or spatulate. |
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137 P. christii |
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Pinnules only dentate-spinulose on margin, elliptic. |
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138 P. bissectum |
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| 11 (9) |
Pinnae often acute; lower part of pinna rachis often not winged; pinnules up to 2 cm, wider than 5 mm; sori medial or nearly medial. |
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139 P. tonkinense |
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Pinnae often acuminate or long acuminate; lower part of pinna rachis often narrowly winged; pinnules up to 1 cm, ca. 3 mm wide; sori submarginal. |
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140 P. excelsius |
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List of lower taxa
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