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

2. Diplopterygium (Diels) Nakai, Bull. Natl. Sci. Mus., Tokyo. 29: 47. 1950.

里白属 li bai shu

Authors: Jin Xiaofeng, Bingyang Ding & Kunio Iwatsuki

Gleichenia sect. Diplopterygium Diels in Engler & Prantl, Nat. Pflanzenfam. 1(4): 353. 1900.

Rhizomes long creeping, branched, with protosteles, covered with scales; scales brown, lanceolate, margin entire or ciliate. Fronds distant; rachis undivided, producing 1 to several successive pairs of pinnae; stipe and rachis with lanceolate scales and stellate hairs when young, these glabrescent or persistent; dormant apical bud with dense brown scales, outer bracts pinnatifid, leaflike; primary pinnae opposite, 2(or 3)-pinnatifid, spreading or drooping; ultimate pinnules many, obliquely or horizontally spreading, deeply pectinately pinnatifid to costa, lanceolate in outline, sessile or shortly stalked at base, apex acuminate; lobes linear to narrowly oblong-lanceolate, margin entire and slightly reflexed, apex emarginate; veins once forked with a pair in each group, spreading to lobe margins. Sori in single lines on either side of costule; sporangia 2-4; spore tetrahedral, without perispore.

About 20 species: tropical and subtropical areas, mainly distributed in tropical Asia; nine species (four endemic) in China.

The FRPS account of the Gleicheniaceae treated all species of Diplopterygium as members of the genus Hicriopteris C. Presl, but Holttum (Reinwardtia 4: 261. 1957) showed that the type of Hicriopteris belonged in Dicranopteris.

One of us (Iwatsuki) considers that Diplopterygium, as treated here, is split into too many species.

1 Pinnules with a short stipe at base, stipe 3-4 mm.   1 D. blotianum
+ Pinnules sessile   (2)
2 (1) Costae and costules with dense scales   (3)
+ Costae and costules without scales, sometimes with sparse stellate hairs   (4)
3 (2) Lamina papery; stipes, costae, and costules with brown scales and stellate hairs; pinnules 22-24 mm wide; sori and veins bare.   2 D. chinense
+ Lamina thinly leathery; stipes, costae, and costules with dense rufous scales and stellate hairs; pinnules 10-12 mm wide; sori and veins ?densely covered with rufous hairs.   3 D. rufum
4 (2) Lobes obliquely spreading   (5)
+ Lobes horizontally or subhorizontally spreading   (7)
5 (4) Fronds 3-pinnate; pinnules irregular, entire, pinnatifid, or pinnatisect.   4 D. irregulare
+ Fronds 2-pinnate; pinnules regular, pinnatifid or pinnatisect   (6)
6 (5) Pinnules pinnatisect, 15-25 mm wide, glossy; lobes 25-40 pairs.   5 D. laevissimum
+ Pinnules pinnatifid, 30-40 mm wide; lobes 60-70 pairs.   6 D. cantonense
7 (4) Pinnae and pinnules smaller; pinnules 11-17 ?1.5-2.5 cm; veins 10 or 11 pairs on abaxial lobe surface.   7 D. glaucum
+ Pinnae and pinnules larger; pinnules 15-22 ?2.4-4 cm; veins more than 15 pairs on abaxial lobe surface   (8)
8 (7) Lobes thinly leathery; pinnules glaucous abaxially.   8 D. giganteum
+ Lobes thickly membranous; pinnules green abaxially.   9 D. maximum

Lower Taxa


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