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FOC | Family List | FOC Vol. 2-3 | Dennstaedtiaceae

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.

1 Pinnae subsessile, linear-lanceolate, 2-3 cm wide, basal pinnules shorter or not   (2)
+ Pinnae stalked, lanceolate, 5-10 cm wide, basal pinnules longest   (3)
2 (1) Basal pinnae obviously progressively shorter; middle pinnae 6-8 ?1.2-1.5 cm, 1.5-2 cm apart.   1 D. appendiculata
+ Basal pinnae not obviously shortened; middle pinnae ca. 13 ?2-2.3 cm, 3-3.5 cm apart.   2 D. elwesii
3 (1) Stipe and rachis sparsely spiny, spines conical, ca. 1.5 mm; fronds of indefinite length, scandent.   3 D. scandens
+ Stipe and rachis glabrous or only with hairs; fronds free standing   (4)
4 (3) Plants to 30 cm tall; fronds 2- or 3-pinnatisect, pinnae 2-6 cm   (5)
+ Plants 50-200 cm tall or more; fronds 3- or 4-pinnate, pinnae 10-30 cm   (6)
5 (4) Stipe shiny, chestnut-brown at base, lamina glabrous.   4 D. wilfordii
+ Stipe not shiny, straw-colored, lamina densely hairy.   5 D. hirsuta
6 (4) Stipe to 100 cm, 20-30 mm in diam.; indusium brown.   6 D. smithii
+ Stipe 20-60 cm, 2-5 mm in diam.; indusium green or gray-green   (7)
7 (6) Stipe chestnut-brown at base; lamina 20-29(-50) ?15-20 cm, usually densely hairy (?glabrous in var. glabrescens).   7 D. scabra
+ Stipe dark or dark chestnut-brown; lamina 60-70 ?24-28 cm, always glabrous.   8 D. melanostipes

Lower Taxa


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