Coniogramme bashanensis (Pteridaceae), a New Fern Species from Shaanxi, China

2013·3.5 MB·English

by  Xiao-Si Guo

New
Coniogramme
bashanensis a Fern Species
(Pteridaceae),
from Shaanxi, China
Guo and Chen
Xiao-si Jian-ping
A&F
College of Life Sciences, Northwest University, Yangling, Shaanxi 712100, China.
[email protected]; [email protected]
A
cm
Abstract. new species, Coniogramme bashanen- Herbs perennial, 60-90 stems basally
tall;
&
Guo 40-
sis X. S. B. Li (Pteridaceae), is described and decumbent; scales dark brown, lanceolate; stipes
mm
new
illustrated. This fern species was collected from 60 cm, ca. 5 diam., gray-brown or stramineous;
Bashan Langao County
the northern slope of Mt. in of base with sparse, brown, linear-lanceolate scales;
X
Shaanxi Province, China. It is similar to C. wilsonu lamina 30-40 ca. 25 cm, broadly ovate, bipinnate;
and
Hieron. in its perennial habit frond veins that are lateral pinnae in 4 to 5 pairs, opposite, oblique and
X
1- or 2-forked, occasionally connected to form one or 15-20 10
slightly incurved, basal pair largest, ca.
fem
two areoles. These taxa differ by the shape of the cm, petioles 3-4 cm, pinnate; lateral pinnules in 1 to
X
frond base. Pinnules are asymmetrically cuneate or 10-15 2.5-4 cm, oblong
3 pairs, to lanceolate,
hastate, or divided with a small auriculate segment in
apex acuminate and caudate, base rounded
to
bashanensis; pinnules are cordate or rounded
C. to
cuneate or hastate, shortly stalked or sessile; medial
X
15-18 3-4
pinnae simple, oblong or lanceolate,
Key Coniogramme, IUCN Red
words: China,
2-20 mm,
cm,
petiolules otherwise similar to lateral
Mt. Bashan, Pteridaceae, Shaanxi.
List,
pinnules, hastate or divided with a small auricular
segment base, unequal; terminal pinnules larger
at
The genus Coniogramme Fee (Pteridaceae) con-
than adjacent pinnules, petiolules 1.8 cm, oblong to
50 mainly
sists of ca. species, distributed in tropical
lanceolate, apex acuminate and caudate, base
and subtropical regions of Asia, few of which are
rounded cuneate, unequal; fronds herbaceous
& to
(Wu
distributed in Africa and South America
when
dry, adaxially dark green, abaxially gray-green,
About 39 Coniogramme
Ching, 1991). species of
were documented from China in the Flora Reipu-
serrulate with minute, slightly irregular, deltate teeth;
blicae Popularis Sinicae (Shing, 1990), mainly in the
1- or 2-forked, occasionally connected to form 1
or 2 areoles; the veinlets end in hydathodes;
ern China. Recently, in the course of exploration in
hydathodes thickened, reaching
slightly linear, to
the Bashan Mountains, several specimens of Con-
base of teeth. Sori continuous along pinnule veins,
iogramme were collected. However, these specimens
mm
extending 6 from the pinna margin.
to
a small auricular segment the pinnule base, which
at
and Coniogramme
Distribution habitat. basha-
known
only from Langao County in Shaanxi
species. After careful examination of other morpho-
Province, China. Langao County located in the
is
we new
logical characters, determine this to be a
middle of the northern slope of Mt. Bashan. The new
species of Coniogramme, which described herein.
is
species occurs in secondary forest, as well as along
&
Coniogramme Guo
bashanensis X. S. B. Li, sp.
nov. TYPE: China. Shaanxi: Langao, Yihe town, locality deciduous broad-leaved forest or mixed
is
Shiziwan 32°16'27"N, 109°4'13"E, temperate coniferous and broad-leaved and the
village, forest,
1250 m, 15 Oct. 2004, Y.-s. Chen, Z.-h. Wu, dominant species are Quercus aliena Blume var.
&
WUK;
B. Li X.-s. Guo 1965 (holotype, isotype, acutiserrata Maxim, ex Wenz., Pinus tabuliformis
WUK).
Figures 1-3.
IUCN
Red Coniogramme
& List category. basha-
Coniogramme Guo
Diagnosis. bashanensis X. S. B.
known
nensis only from one population with mature
is
individuals fewer than 150. distributional area
Its is
hastate base or the base divided with a small auricular
km
100 2 The known
smaller than only population of
.
C. bashanensis severely threatened by developing
is
the latter has lanceolate pinnules somewhat cordate or
and
rounded-cuneate and glabrous on both surfaces. tourism overgrazing in the area. Its conservation
May
Novon 22: 292-296. Published on 24 2013. 10.3417/2009145
doi:

294 Novon
new
r forked once or twice, or rarely species differs from the latter by its pinnules
free veinlets. The oblong to lanceolate, the base unequal, rounded to
,
veinlets end in hydathodes and are hastate or divided with a small auricular
that are continuously distributed along the veins. segment, and sparsely short hairs on both lamina
Coniogramme bashanensis is very distinct from other surfaces. As for C. wilsonii, its pinnules are
known species of Coniogramme in China and can lanceolate, also with an unequal base, somewhat
easily be recognized by having four to five pairs of cordate or rounded to cuneate, and both lamina
Coniogramme Coniogramme was
lateral pinnae. bashanensis other- surfaces are glabrous. intermedia
is
wise similar to C. wilsonii in general morphology. also found near the distributional area of C.
Both species have 1- or 2-forked veins, forming a few bashanensis, but the latter species has pinnules with
discontinuous areoles along each side of costae. The a rounded to cuneate base and veins that do not form

Novon
United Kingdom.
Coniogramme 228-274
Shing, K.-H. 1990. Fee. Pp. in R.-
&
C. Ching K.-H. Shing (editors), Flora Reipublicae