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25. Leptochilus Kaulfuss, Enum. Filic. 147. 1824.

薄唇蕨属 bao chun jue shu

Authors: Zhang Xianchun & Hans P. Nooteboom

Colysis C. Presl; Dendroglossa C. Presl; Gymnopteris C. Presl (1836), not Bernhardi (1799); Myuropteris C. Christensen.

Plants epilithic, terrestrial, or epiphytic, sometimes low climbing, small to medium-sized, with long creeping rhizome; scales pseudopeltate or peltate, dark brown, ovate-lanceolate, clathrate or subclathrate, margin entire or toothed, apex acuminate. Fronds remote, articulate, monomorphic or dimorphic; lamina simple, entire, palmately lobed, digitate, pinnatifid, or pinnate with pinnae adnate to rachis, herbaceous to thinly leathery; veins anastomosing, secondary veins prominent, almost reaching margin; usually 1 or 2, sometimes more, rows of areoles between adjacent secondary veins, with ex- or recurrent free veins; fertile fronds similar to sterile ones or sometimes much contracted with lamina ± absent. Sori usually between adjacent secondary veins, orbicular or elongate to linear, sometimes sporangia acrostichoid; spores hyaline to light brown, ellipsoid, aperture 1/4-3/4 of spore length; surface shallowly tuberculate, usually plane with abundant spherical deposits, sometimes with short echinate elements. n = 36, 2n = 72, 108, 144, 216.

About 25 "indistinct" species: Asia; 13 species (two endemic) in China.

Most species have linear sori on tertiary veins parallel to secondary veins, or orbicular to elongate sori in Leptochilus hemionitideus. The delimitation between Colysis and Leptochilus is not obvious, and the two genera were merged by Nooteboom (Blumea 42: 261-294. 1997).

1 Lamina pinnatifid or digitately lobed   (2)
+ Lamina entire and slightly undulate   (5)
2 (1) Lamina digitately to pedately lobed or sometimes 2- or 3-forked, rarely with occasional simple lamina.   10 L. digitatus
+ Lamina pinnately lobed   (3)
3 (2) Lamina regularly deeply pinnatifid.   9 L. ellipticus
+ Lamina ?irregularly lobed near base only   (4)
4 (3) Lamina broadly triangular-lanceolate or hastate, with 1 or 2(-6) pairs of lanceolate, horizontally spreading lobes, abaxial surface sparsely scaly when young.   7 L. ×hemitomus
+ Lamina triangular-lanceolate, with 1-3 pairs of irregular lobes, abaxial surface glabrous.   8 L. ×shintenensis
5 (1) Fertile fronds linear with lamina ?absent. 14!-!Fertile fronds with obvious lamina, often as wide as in sterile fronds   (8)
6 Rhizome flattened, scales sparse, small, narrowly lanceolate, peltate, roots absent or rare at young age, root hairs on rhizome.   11 L. axillaris
+ Rhizome flattened or rounded, scales dense, large, broadly lanceolate, pseudopeltate, roots always present, sometimes sparse   (7)
7 (6) Sterile fronds lanceolate or oblong-lanceolate, 10-50 ?2.5-11 cm, base decurrent, apex acute or acuminate; phyllopodia ?distinct.   12 L. decurrens
+ Sterile fronds ovate or triangular, 2-7 ?1.5-4 cm, base cordate, apex obtuse; phyllopodia obscure.   13 L. cantoniensis
8 (5) Sori orbicular to elongate, in interrupted lines   (9)
+ Sori linear, continuous   (10)
9 (8) Fertile fronds monomorphic; stipe 1-4 cm.   1 L. hemionitideus
+ Fertile fronds dimorphic; stipe 4-10 cm.   2 L. ×beddomei
10 (8) Leaves dimorphic.   3 L. pedunculatus
+ Leaves monomorphic   (11)
11 (10) Lamina abaxial surface with small scales and scale-shaped soral paraphyses.   4 L. wrightii
+ Lamina abaxial surface without small scales and scale-shaped soral paraphyses   (12)
12 (11) Fronds elliptical or ovate-lanceolate; lamina normally rather abruptly narrowed below middle, venation indistinct.   5 L. henryi
+ Fronds narrowly linear; lamina gradually decurrent nearly to base, venation distinct.   6 L. leveillei

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