Aleuritopteris gongshanensis (Pteridaceae), a New Species from Yunnan, China

2004·1.7 MB·English

by  Gang-Min Zhang

Aleuritopteris gongshanensis (Pteridaceae), a New Species from
Yunnan, China
Gang-Min /hang
Institute of Botany, Chinese Academy of Sciences, Beijing 100093, People’s Republic of
China, and Beijing Forestry University, Beijing 100083, People’s Republic of China.
[email protected]
Wen-Li Yang
Hebei Agricultural University, Banding 071000, People’s Republic of China.
[email protected]
Xian-Chun Zhang
Institute of Botany, Chinese Academy of Sciences, Beijing 100093, People’s Republic of
China, [email protected]
ABSTRACT. Aleuritopteris gongshanensis C. M. tagona Saiki. we confirmed that these specimens
Zhang, a new species of Pteridaceae from Yunnan were different from the above known species.
Province, China, is described and illustrated. The
new species is very similar to A. pseudoargentea S. Aleuritopteris gongshanensis G. M. Zhang, sp.
K. Wu, but differs in its ovate-deltate fronds with nov. TYPE: China. Yunnan: Gongshan, Bing-
white farina abaxiallv. an indusial margin distinctly zhongluo. under thickets in dry, hot valley, ea.
lacerate, and spores with a reticulate-cristate per- 1650 m, 28 June 1988, W. M. Chu, II. Z. Yan,
ine. X. C. Zhang & G. F. Zhang 22789 (holotype,
PYU; isotype, PE). Figures 1, 2.
Key words: Aleuritopteris, China. Pteridaceae.
Species A. pseudoargenteae affinis, seel laminis ovato-
tleltatis non pentagonis, subtus eandido-farinosis, pinnis
Aleuritopteris Fee is a middle-sized genus mainly
secundis a basalibus 1.5—4 cm remotis, ambitu confor-
distributed in Asia and Africa (Ching, 1941; Saiki. mibus sed minoribus aliquantum, indusiis margine lac-
1984a. 1984b; Shing & Wu, 1990; Wu. 1981). It is eratis, perisporis reticulato-cristatis differt.
characterized by usually living in a xeric or semi-
xeric habitat and having farina abaxially on fronds. Rhizomes short, erect, scaly; scales uniformly
This genus was reduced to synonymy of Cheilanthes black or dark brown, coneolorous, lanceolate, ea.
Swartz by some pteridologists (Tryon et al., 1990). 0.5 X 6 mm. Leaves monomorphic, clustered, 20—
Recent studies (Gastony & Kollo. 1995), however, 30 cm high; stipes 10—18 cm, longer than laminae,
have shown that the species from the Old World are 1—1.5 mm diam., ebeneous, glossy, rounded adax-
not closely related to those of real Cheilanthes from ially, scaly at base (scales similar to those of rhi¬
America and should belong to a different group. zome); laminae ovate-deltate, caudate at tip. 8—13
Here the authors prefer to accept Aleuritopteris X 4.5—8.5 cm, papyraceous or subcoriaceous,
rather than Cheilanthes as the generic name for the adaxially glabrous, abaxially with white farina, tri-
group from the Old World. pinnatifid at base; rachises similar to stipes, but
In revising the Chinese species of Aleuritopteris, suleate adaxially: pinnae 5 to 8 pairs, usually op¬
the authors noticed that some specimens at PA U posite or sometimes alternate, oblique, sessile, bas¬
and PE were erroneously identified as A. cremea al pinnae largest, deltate. strongly inequilateral, 4—
Ching (= A. veitchii (H. Christ) Ching). These spec¬ 7 X 4—5 cm. bipinnatifid; pinnules 4 to 7 pairs,
imens are distinguished by having finely dissected alternate; acroscopic pinnules much smaller, usu¬
fronds, distinctly lacerate indusial margins, and ally simple, ea. 8 X 3 mm. obtuse at apex, broadly
spores with a reticulate-cristate perine. After ex¬ adnate to costa; proximal basiscopic pinnules great¬
amining tlie types of related taxa in Aleuritopteris, ly enlarged, oblong, to 4 X 1.5 cm, pinnatifid; ul¬
including ,4. veitchii, A. pseudoargentea, and A. pen- timate segments 4 to 5 pairs, oblong to ovate, ob-
Novon 14: 513—515. 2004.
514 Novon
Eigure 1. Aleuritopleris gongshanensis (;. M. Zhang. Drawn from ihe isotype, W. M. Chu el al. 22789 (PE), —a. Habit.
—I), c. Rhizome scales. d. Ultimate segments. —e. Magnification of a segment. —f. Pseudoindusia.
fuse al apex, middle ones to 1.5 X 0.3 cm; second gin. Sporangia 64-spored. Spores subglobose. 45 X
pinnae 1.5—4 cm apart from the basal ones, similar 51 gm. with a reticulate-cristate perine.
Iml smaller; upper pairs usually shorter than lower
ones. Sori confluent al maturity; pseudoindusia nar¬ Distribution and habitat. Specimens were col¬
row, membranous, continuous, with a lacerate mar¬ lected only in northwestern and central Yunnan.
Volume 14, Number 4 Zhang et al. 515
2004 Aleuritopteris gongshanensis (Pteridaceae)
Figure 2. Spore morphology of Aleuritopteris gongshanensis. Spores taken from the isotype, W. M. Chu et al. 22789
(PE). —A. Proximal view, X780. —B. Distal view, X780. Bar length = 23.1 ptm.
The species usually grows under thickets in dry, town, 3 Sep. 1988, W. M. Chu et al. 22239 (PYU); l.ushui,
14 Oct. 1988, W. M. Chu et al. 22969 (PYU); Yimen,
hot valleys at ea. 1030—1700 m.
Xiaoliizhi, 20 Oct. 1965, IT. M. Chu 4664 (PYU), 26 Apr.
Aleuritopteris gongshanensis is similar to A. pseu-
1983, W. 17. Chu et al. 15850 (PE, PYU).
doargentea and A. veitchii in its concolorous rhi¬
Acknowledgments. The first author is grateful to
zome scales, but differs in its ovate-deltate fronds
Professor Chu Weiming, curator of the herbarium
with white farina abaxially, an indusial margin dis¬
tinctly lacerate, and spores with a reticulate-cris¬ of Yunnan University, for kind help and hospitality
tate perine. The new species is also similar to A. during a visit to PYU. Thanks also to Sun Yingbo
pentagona, but differs in its concolorous rhizome for his illustration. This work was supported by a
scales. The main differences between these species Special Grant for Biological Researches (2001)
are summarized in the following key. from the Chinese Academy of Sciences.
kn to Aleuritopteris Gongshanensis and Its Related Uiterature Cited
Species Ching, R. C. 1941. The studies of Chinese ferns—XXXI.
la. Scales on the rhizome dark brown to black, con¬ Hong Kong Naturalist 10: 194—204.
colorous. Gastony, G. J. & D. R. Rollo. 1995. Phytogeny and ge¬
2a. Indusial margin entire or slightly sinuous; neric circumscriptions of cheilanthoid ferns (Pterida¬
fronds abaxially with yellow or light yellow ceae: Cheilanthoideae) inferred from rbcL nucleotide
farina. sequences. Amer. Fern J. 85: 341—360.
3a. Fronds coarsely dissected; spores with Saiki, Y. 1984a. Note on ferns (2). Asiatic species of the
a reticulate perine . . Aleuritopteris veitchii Aleuritopteris farinosa complex. J. Phytogeogr. Taxon.
3b. Fronds finely dissected; spores with a 32(1): 1-12.
cristate perine . -. 1984b. Note on ferns (3). African and Neotropi¬
.Aleuritopteris pseudoargentea cal species of the Aleuritopteris farinosa group. J. Phy¬
2b. Indusial margin distinctly lacerate; fronds togeogr. Taxon. 32(2): 81—90.
abaxially with white farina. Shing, K. H. & S. K. Wu. 1990. Sinopteridaceae. Pp. 97-
.Aleuritopteris gongshanensis 173 in R. C. Ching & K. H. Shing (editors). Flora Rei-
lb. Scales on the rhizome bicolorous, with dark cen¬ publicae Popularis Sinicae 3(1). Science Press, Beijing.
tral stripe and lighter margins. Tryon, R. M., A. F. Try on & K. U. Kramer. 1990. Chei-
. Aleuritopteris pentagona lanthes Sw. Pp. 242 in K. Kubitzki (editor). The Fam¬
ilies and Genera of Vascular Plants, Vol. 1. Pterido-
Paratypes. CHINA. Yunnan: Gongshan, Bingzhon- phytes and Gymnosperms, K. U. Kramer & P. S. Green
gluo, 20 June 1983, W. M. Chu et al. 17681 (PYU), Qing- (volume editors). Springer-Verlag, Berlin.
hai-Xizang Exped. 7400 (KUN), 25 May 1960, S. Jiang Wu, S. K. 1981. A study of the genus Aleuritopteris Fee
et al. 8745 (KUN, PE, PYU); nearby Gongshan county in China. Acta Phytotax. Sin. 19(1): 57—74.