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6. Dennstaedtia Bernhardi, J. Bot. (Schrader). 1800(2): 124. 1801.
碗蕨属 wan jue shu
Authors: Yan Yuehong, Qi Xinping & Shunshuke Serizawa
Emodiopteris Ching & S. K. Wu.
Plants terrestrial. Rhizome creeping, very stout, clothed with multicellular, rather stiff, dark hairs. Fronds homomorphic; stipe grooved above, hairy when young, hairs abscising with age, slightly scabrous; lamina triangular to oblong, many times pinnate, usually densely hairy, especially on rachis, rarely glabrous; pinnules oblique, asymmetrically cuneate at base. Veins free, pinnately branching, veinlet not reaching margin, with hydathode at apex. Sori orbicular, marginal, terminal on each veinlet, separate, usually extrusive from lobes; indusium bowl-shaped, two layers (fused from an internal and external valve), external valve derived from deteriorated lobules or serrations, margin entire, rarely notched, usually ± curved downward like a tobacco pipe, thick; receptacle short, sporangium with slender long stalk, annulus erect, interrupted by sporangiophore at lower part. Spore tetrahedral.
About 70 species: mostly distributed in tropics and subtropics; eight species (two endemic) in China.
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| 1 |
Pinnae subsessile, linear-lanceolate, 2-3 cm wide, basal pinnules shorter or not |
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(2) |
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Pinnae stalked, lanceolate, 5-10 cm wide, basal pinnules longest |
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(3) |
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| 2 (1) |
Basal pinnae obviously progressively shorter; middle pinnae 6-8 ?1.2-1.5 cm, 1.5-2 cm apart. |
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1 D. appendiculata |
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Basal pinnae not obviously shortened; middle pinnae ca. 13 ?2-2.3 cm, 3-3.5 cm apart. |
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2 D. elwesii |
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| 3 (1) |
Stipe and rachis sparsely spiny, spines conical, ca. 1.5 mm; fronds of indefinite length, scandent. |
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3 D. scandens |
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Stipe and rachis glabrous or only with hairs; fronds free standing |
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(4) |
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| 4 (3) |
Plants to 30 cm tall; fronds 2- or 3-pinnatisect, pinnae 2-6 cm |
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(5) |
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Plants 50-200 cm tall or more; fronds 3- or 4-pinnate, pinnae 10-30 cm |
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(6) |
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| 5 (4) |
Stipe shiny, chestnut-brown at base, lamina glabrous. |
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4 D. wilfordii |
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Stipe not shiny, straw-colored, lamina densely hairy. |
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5 D. hirsuta |
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| 6 (4) |
Stipe to 100 cm, 20-30 mm in diam.; indusium brown. |
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6 D. smithii |
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Stipe 20-60 cm, 2-5 mm in diam.; indusium green or gray-green |
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(7) |
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| 7 (6) |
Stipe chestnut-brown at base; lamina 20-29(-50) ?15-20 cm, usually densely hairy (?glabrous in var. glabrescens). |
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7 D. scabra |
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Stipe dark or dark chestnut-brown; lamina 60-70 ?24-28 cm, always glabrous. |
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8 D. melanostipes |
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Lower Taxa
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