Polystichum oblanceolatum , a New Species in Section Haplopolystichum (Dryopteridaceae) from Guangxi, China

2012·5 MB·English

by  Hai He

New
Polystichum oblanceolatum a Species Section Haplopolystichum
in
,
(Dryopteridaceae) from Guangxi, China
HaiHe
College of Life Sciences, Chongqing Normal University, Shapingba, Chongqing 400047, People’s
Republic of China, [email protected]
Zhang*
Li-Bing
Missouri Botanical Garden, P.0. Box 299, Louis, Missouri 63166-0299, U.S.A., and Chengdu
St.
Academy
Institute of Biology, Chinese of Sciences, P.0. Box 416, Chengdu, Sichuan 610041,
People’s Republic of China.
*
Corresponding [email protected]
author:
A
Abstract. new fern species, Polystichum oblan- species from southwestern China have been de-
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He
ceolatum H. Li Bing Zhang (Dryopteridaceae), scribed Zhang He, 2012). Our extended
(cf.
described and illustrated from a karst cave in fieldwork with respect to the fern flora in Chongqing,
is
Guangxi, southern China. As a member of Poly- Guangxi, Guizhou, Sichuan, and Yunnan in recent
new
stichum Roth sect. Haplopolystichum Tagawa, P. years has so far led to the discovery of several
oblanceolatum is morphologically most similar to P. species from limestone areas, most of which are
&
dielsii Christ and P. liui Ching, but is distinguishable endemic to a single cave or sinkhole (Zhang He,
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He
from the two by often oblanceolate lamina 2009a, 2009b, 2009c, 2010, 2011, 2012;
latter its
with acute apex, repand or broadly dentate pinnae Zhang, 2010, 2011; Zhang et al, 2010). However, the
its
with non-spinulose toothed distal margins, and the high diversity of Polystichum in China, especially in
less developed, more or less truncate, but not sharply less explored southwestern China, is still far from
acute, basal acroscopic auricles of the pinnae. The being well understood.
new we
taxon appears to be endemic to a single karst During fieldwork in 2009, found a species of
cave in Tian’e County in northern Guangxi and Polystichum with mostly oblanceolate leaves from a
is
considered to be Critically Endangered (CR), based karst cave in Tian’e County, northern Guangxi,
A
IUCN Red we new
on List criteria. key is provided to China. Herein describe this as another cave
facilitate the identification of P. oblanceolatum and species of Polystichum sect. Haplopolystichum Taga-
morphologically similar species.
Key
words: China, Dryopteridaceae, Guangxi,
&
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Polystichum oblanceolatum H. Bing
Li
IUCN
Red
Polystichum.
List,
TYPE:
Zhang, sp. nov. China. Guangxi: Tian’e
Yaozu Autonomous Town-
Bala (Laopeng)
Co.,
Species of Polystichum Roth (Dryopteridaceae) are
Madong
Zhichang, on weathered
ship, Village,
widely distributed in the mountains of subtropical
crust of limestone rocks bottom of one of two
at
and warm- temperate areas in the Northern Hemi-
small caves inside a larger karst cave,
24°48.59'N, 107°03.05'E, 890 m, 13 Nov.
many many ca.
and
the superficial similarity of taxa, the
&
Zhang He 5179
2009, B. H. (holotype,
L.
CDBI; CDBI, CTC, MO).
isotypes, Figures 2.
genus estimated contain (180 to)225 400 1,
is to to
species worldwide (Kramer, 1990; Fraser-Jenkins,
&
Wang
1991; Kung et 2001; Wang, 2001; Lu, Species Polysticho liui Ching et P. dielsii Chnst affims,
al.,
2005), with about 250 or more species estimated in
Asia (Benniamin ah, 2008). In China, Polystichum
et
spinuloso-dentatis atque auriculis basalibus acroscopicis
known
the most species-rich fern genus, with most
is
species being found in southwestern China and
cm
(Kung
adjacent regions ah, 2001). Since the Plants perennial, evergreen, (2.8-)6.5-9.5
et tall;
mm
X
publication of the Chinese-language Flora Reipubli- rhizome erect, ca. 4.3 2. 7-4.3 with bases of
cae Popularis Sinicae, which recognized 168 species remnant old petioles, sparsely scaly; scales lanceo-
X
in Polystichum (Kung et al., 2001), more than 13 new late, ca. 0.7 0.1 mm, dark brown, margins entire;
Novon 22: 160-165. Published on 30 November 2012. 10.3417/2011010
doi:

Novon
,
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