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14. Aleuritopteris Fée, Mém. Foug. 5: 153. 1852.

粉背蕨属 fen bei jue shu

Authors: Zhang Gangmin, George Yatskievych & Elisabeth A. Hooper

Leptolepidium K. H. Shing & S. K. Wu; Sinopteris C. Christensen & Ching.

Plants small, usually on rocks. Rhizomes erect or ascending, short; scales brown to black, concolorous or bicolorous with dark, central stripe and lighter margins, mostly narrowly to broadly lanceolate. Fronds numerous, clustered. Stipe and rachis black, dark brown, or reddish brown, shiny, terete or rarely sulcate, scaly proximally or less commonly throughout, occasionally also hairy. Lamina variously shaped, pinnate-pinnatifid to pinnate-tripinnatifid, abaxially farinose or less commonly lacking farina, farina white to milky yellow or yellow, otherwise glabrous or occasionally hairy and/or scaly abaxially, adaxially glabrous or rarely with hairs or scales; rachis grooved adaxially. Pinnae sessile or subsessile, at least some pinnae often somewhat falcate, basal pinnae usually largest; basal basiscopic segments enlarged, longer than adjacent acroscopic ones. Veins free but often obscure, pinnate, usually branched. Sori consisting of 1-10 sporangia, orbicular, at vein tips, separate when young, often confluent at maturity. False indusia membranous or herbaceous, brown, grayish brown, or rarely light green, often drying brown, continuous, or interrupted, margins entire, erose, lacerate, or fimbriate. Spores globose to globose-tetrahedral or tetrahedral, trilete, perispore reticulate, cristate, echinate, rugulate, or granular. x = 29, 30.

About 40 species: tropical and subtropical regions of both the Old and New Worlds; 29 species (14 endemic) in China.

The genus Aleuritopteris is here circumscribed relatively broadly to include Leptolepidium and Sinopteris, which were segregated based on morphological characters that represent specializations within Aleuritopteris. Additionally, most of the species assigned by previous authors to Cheilosoria Trevisan and Notholaena R. Brown are more closely related to Aleuritopteris based on molecular data, which would raise the total number of species in the genus to ca. 70. See Cheilanthes for further discussion of these groups. Circumscription of Aleuritopteris remains controversial, and a stable resolution must await future publication of a comprehensive generic classification for the cheilanthoid ferns that incorporates the full range of morphological, cytological, and molecular data.

1 Veins dark brown to black (sometimes partially obscured by farina), stout, prominently raised abaxially; sori with 1(or 2) large sporangium with broad annuli   (2)
+ Veins green (sometimes obscured by farina), slender, not or only slightly raised abaxially; sori consisting of (1 or)2 to several small sporangia with narrow annuli   (3)
2 (1) Lamina 7-10 cm; medial pinnae pinnatifid; false indusia interrupted.   1 A. grevilleoides
+ Lamina 3.5-8 cm; medial pinnae bipinnatifid; false indusia continuous.   2 A. albofusca
3 (1) Lamina mostly pentagonal, nearly as wide as long; pinnae lobed to pinnatifid or only proximal 1-3 pairs of pinnae separated by wingless rachis; false indusia continuous, with entire or undulate margins   (4)
+ Lamina triangular-ovate, oblong-lanceolate, or oblong; pinnae usually 5-10 pairs or more, separated from each other by wingless rachis; false indusia usually interrupted, rarely continuous   (16)
4 (3) Lamina moderately to densely scaly on surface and veins abaxially.   3 A. squamosa
+ Lamina lacking scales abaxially or scaly only on rachis and costae   (5)
5 (4) Lamina glabrous, lacking farina abaxially   (6)
+ Lamina with white or yellow farina abaxially (note that herbarium specimens dried with heat or treated with chemicals sometimes appear to lack farina and also rare hybrids involving farinose parental taxa sometimes do not produce farina)   (8)
6 (5) Pinnae curved upward; basal pinnae strongly inequilateral, acroscopic pinnules strongly reduced or lacking; lamina coarsely divided, ultimate segments falcate.   12 A. duclouxii
+ Pinnae spreading or obliquely angled upward, moderately inequilateral, basal acroscopic pinnules developed, but shorter than basiscopic ones; lamina finely divided, ultimate segments relatively straight   (7)
7 (6) Second pair of pinnae (from lamina base) shorter than basal and third ones.   9 A. tamburii
+ Second pair of pinnae (from lamina base) shorter than basal pair but longer than third ones.   11 A. argentea
8 (5) Lamina usually less than 5 cm, with snow-white farina abaxially; sori consisting of (1 or)2 or 3 sporangia, discrete   (9)
+ Lamina usually more than 5 cm, with milky white or yellow farina abaxially; sori consisting of 3 to several sporangia, often confluent at maturity   (11)
9 (8) Laminae longer than stipes; stipes with scales and twisted hairs, these extending onto rachis and costae.   4 A. pygmaea
+ Laminae shorter than stipes; stipes scaly only at base, not hairy; rachis and costae not hairy or scaly   (10)
10 (9) Lamina with basal pair of pinnae nearly equilateral, basal acroscopic segments lobed or pinnatifid, nearly as long as opposing basal basiscopic segments.   5 A. speciosa
+ Lamina with basal pair of pinnae inequilateral, basal acroscopic segments simple, entire, much shorter than opposing basal basiscopic segments.   6 A. niphobola
11 (8) Scales of rhizome concolorous, dark brown to black   (12)
+ Scales of rhizome bicolorous, with a brown to black central stripe and lighter margins   (13)
12 (11) Lamina with white farina abaxially and with relatively dense red glands (actually farina-producing glands with a red apical cell).   7 A. likiangensis
+ Lamina with milky yellow farina abaxially, lacking red glands or some farina-producing glands with apical cell light brown, rarely somewhat reddish tinged.   8 A. veitchii
13 (11) Lamina with light yellow to lemon-yellow farina abaxially.   12 A. duclouxii
+ Lamina with white farina abaxially   (14)
14 (13) Second pair of pinnae (from lamina base) shorter than basal pair but longer than third ones.   11 A. argentea
+ Second pair of pinnae (from lamina base) shorter than basal and third ones   (15)
15 (14) Medial pinnae rounded or bluntly pointed at tips; distal lobes of pinnae oblong, oblong-triangular, or nearly semicircular, with narrow V-shaped sinuses between lobes.   9 A. tamburii
+ Medial pinnae attenuate at tips; distal lobes of pinnae linear to narrowly oblong, with broad U-shaped sinuses between lobes.   10 A. yalungensis
16 (3) Lamina lacking farina at maturity (young fronds sometimes farinose)   (17)
+ Lamina with white or yellow farina abaxially   (19)
17 (16) False indusia continuous, margins undulate; lamina hairy abaxially.   28 A. subvillosa
+ False indusia interrupted, margins laciniate; lamina glandular abaxially or glabrous except for inconspicuous hairs at pinna bases   (18)
18 (17) Fronds (15-)25-40 cm; stipe terete; lamina glabrous abaxially or occasionally sparsely and inconspicuously hairy at pinna bases.   26 A. leptolepis
+ Fronds 7.5-15 cm; stipe grooved distally; lamina with brown glands along costae and veins abaxially.   27 A. duthiei
19 (16) Stipe with short, dark brown glands.   13 A. sichouensis
+ Stipe not glandular, but often scaly, occasionally also hairy   (20)
20 (19) Stipe, rachis, and costae scaly   (21)
+ Stipe scaly at base, sometimes up to rachis, but scales not extending to costae   (23)
21 (20) Scales on stipe broadly lanceolate, distinctly bicolorous, with conspicuous pale margins.   23 A. albomarginata
+ Scales on stipe narrowly lanceolate, reddish brown, concolorous or mixed with occasional scales having narrow, lighter margins   (22)
22 (21) Lamina glabrous or rarely sparsely hairy adaxially; lamina widest at base.   24 A. dubia
+ Lamina sparsely hairy and with sparse slender scales adaxially; lamina usually widest above base.   25 A. rufa
23 (20) Lamina with milky yellow or golden-yellow farina abaxially   (24)
+ Lamina with white farina abaxially   (26)
24 (23) Stipe black, basalmost stipe scales black, slightly bicolorous, with very narrow, brown margins.   14 A. ebenipes
+ Stipe usually reddish brown to dark brown, basalmost stipe scales concolorous, reddish brown   (25)
25 (24) Lamina with golden-yellow farina abaxially; stipe scales linear-lanceolate.   15 A. chrysophylla
+ Lamina with milky yellow farina abaxially; stipe scales broadly lanceolate.   16 A. krameri
26 (23) Stipe and rachis densely scaly.   17 A. formosana
+ Stipe scaly proximally, rachis not scaly (occasionally sparsely scaly at base in A. anceps)   (27)
27 (26) Rhizome scales brown, ovate-lanceolate, thin and translucent   (28)
+ Rhizome scales black, lanceolate, relatively thick and opaque   (29)
28 (27) Lamina hairy along costae and veins.   28 A. subvillosa
+ Lamina lacking hairs.   29 A. kuhnii
29 (27) Rhizome scales concolorous.   18 A. gongshanensis
+ Rhizome scales bicolorous   (30)
30 (29) False indusia poorly developed to nearly absent.   19 A. dealbata
+ False indusia well developed   (31)
31 (30) False indusia interrupted, with laciniate margins.   20 A. anceps
+ False indusia continuous or sometimes interrupted, margins entire or undulate   (32)
32 (31) Lamina 2-6 cm, thinly herbaceous; false indusia poorly developed, narrow; stipe scales linear-lanceolate.   21 A. rosulata
+ Lamina (3-)10-20 cm, leathery; false indusia well developed, broad; stipe scales broadly lanceolate.   22 A. grisea

  • List of lower taxa


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    Photos by The Biodiversity of the Hengduan Mountains Project  
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