Dryopteris liboensis (Dryopteridaceae), a New Species in Dryopteris sect. Erythrovariae from Guizhou, China

2012·3.2 MB·English

by  Li-Bing Zhang

New
Dryopteris (Dryopteridaceae), a Species Dryopteris
liboensis in
Erythrovariae from Guizhou, China
sect.
*
Zhang
Li-Bing
Missouri Botanical Garden, P.0. Box 299, Louis, Missouri 63166-0299, U.S.A.,
St.
and Chengdu Institute of Biology, Chinese Academy of Sciences, P.0. Box 416,
Chengdu, Sichuan 610041, People’s Republic of China
Wang Wang
Pei-Shan and Xiao-Ying
Academy
Guizhou of Sciences, Guiyang, Guizhou 550001, People’s Republic of China
[email protected]
* Author correspondence: [email protected]
for
Wang,
Abstract. Dryopteris liboensis P. S. X. Y. presence of bullate scales to define Dryopteris subg.
&
Wang
new As
Li Bing Zhang, a species of Dryopteris Erythrovariae. a result of the differing circum-
Adans. (Dryopteridaceae) from southern Guizhou, scriptions, the taxonomic placement of a few species,
A
China, is described and illustrated. Dryopteris e.g., D. polita Rosenst., has been controversial.
liboensis is assigned to Dryopteris subg. Erythrovariae recent molecular analysis demonstrated that Fraser-
(H. Fraser-Jenk. on the basis of and Jenkins’s (1986) definition of Dryopteris subg.
Ito) its stiff
narrow petiole and rachis scales, but the new species Erythrovariae is more natural (Zhang et al., 2012).
summer
noteworthy within the section because these scales In the of 2005, one of the authors
is
specimens an
are not bullate. Dryopteris liboensis has narrowly (P.-S.W.) collected of unidentified
stiff,
lanceolate and filiform scales on the petiole and species of Dryopteris. Additional material was
rachis and therefore considered a member of the D. collected in 2009 and 2010 from the same locality.
is
members
erythrosora (D. C. Eaton) Kuntze group of Dryopteris This species is similar to of Dryopteris subg.
Erythrosoriae H. unique among Chinese Erythrovariae in the shape of the petiole and rachis
sect. Ito. It is
The
taxa of Dryopteris sect. Erythrovariae in having leaves scales, but the scales are not bullate. discovery of
an
1- or 2-pinnate basally, with zero to three free lobes, this species offered opportunity to test the
Wu
and 1-pinnatifid the blade apex. differing views of Fraser-Jenkins (1986) and
at
and Lu
Key
words: China, Dryopteridaceae, Dryopteris, (2000).
IUCN
Red
Guizhou,
List.
&
Wang
Wang,
Dryopteris liboensis P. S. X. Y. Li
TYPE:
Bing Zhang, nov. China. Guizhou:
sp.
Dryopteris Adans. (Dryopteridaceae) one of the
is
Wujia 25°21'L71"N,
Libo Co., Lihua, River,
300 more
largest fern genera, with about or species
108°7
'32.26 "E, 520 m, on rock wall by 3
river,
worldwide (Lu, 1993). Dryopteris has been classified
Wang 20052 PYU;
Aug. 2005, P.-S. (holotype,
into four subgenera as Dryopteris subg. Dryopteris,
MO, Wang
CDBI, Herbarium Pei-Shan
isotypes,
Dryopteris subg. Erythrovariae (H. Fraser-Jenk.,
Ito)
[Guizhou Institute of Biology]). Figure 1.
Dryopteris subg. Nephrocystis (H. Fraser-Jenk.,
Ito)
and Dryopteris subg. Pycnopteris (Moore) Ching
subgenera
(Fraser-Jenkins, 1986), or three as
&
Li Bing Zhang is most similar to species of the D.
Dryopteris subg. Dryopteris, Dryopteris subg. Eryth-
&
(Wu
and
rovariae, Dryopteris subg. Pycnopteris Lu,
2000). Of these, Dryopteris subg. Erythrovariae one
is filiform scales on the petiole base and rachis, but differs
it
The
tions. circumscription of Dryopteris subg.
pairs of free lobes only, rather than either
Wu 1-j:
Erythrovariae by and Lu however,
(2000), differs
slightly from that of Fraser-Jenkins (1986). Fraser-
Jenkins used morphological
(1986) overall similari-
13-26 cm 5-7
ties to characterize Dryopteris subg. Erythrovariae Terrestrial, evergreen, rhizomes
tall;
mm,
and did include a few species without bullate scales. erect or slightly ascending, together with petiole
Wu
In contrast, and Lu (2000) strictly used the bases densely scaled, the scales brown, narrowly
Novon 22: 256-259. Published on 30 November 2012. 10.3417/2012049
doi:
Volume Number Zhang 257
2
22, et
al.
2012 Dryopteris liboensis (Dryopteridaceae) from
Guizhou, China

259
(Dryopteridaceae) from