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Research Article
Bulbophyllum pingnanense (Orchidaceae, Epidendroideae, Dendrobiinae), a new species from Fujian, China
expand article infoJiangfeng Liu, Si-Ren Lan, Bi-Zhu He§, Yi-Chi Liang
‡ College of Landscape, Fujian Agriculture and Forestry University, Fuzhou, China
§ College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou, China
Open Access

Abstract

A new orchid species, Bulbophyllum pingnanense, is described and illustrated from Fujian, China. It is similar to B. brevipedunculatum and B. albociliatum in vegetative and floral morphology, but it can be distinguished from B. brevipedunculatum by having a longer dorsal sepal with longer white ciliate on margin, longer and lanceolate lateral sepals, and a glabrous lip. It can be distinguished from B. albociliatum by having a shorter inflorescence, and a longer dorsal sepal.

Keywords

Bulbophyllum, Eastern China, Fujian, Orchidaceae

Introduction

Bulbophyllum Thouars is one of the largest orchid genera. It includes more than 1900 species and extends widely from tropical America, Africa, Madagascar, and mainland Asia to Australasia (Lindley 1830, Pearce and Cribb 2002, Seidenfaden 1979, 1992, Chen et al. 2009, Pridgeon et al. 2014). There are about 105 species of Bulbophyllum in China, according to the most recent revision and recently published new species (Chen et al. 2009, Jin et al. 2014, Hu et al. 2015). Section Cirrhopetalum (Lindley) Reichenbach is characterized by sub-umbellate inflorescence, shorter dorsal than lateral sepals, twisting and connected lateral sepals, and hairy dorsal sepal and petals (Seidenfaden 1979). Cirrhopetalum includes 57 species, 17 (10 endemic) of which are found in China (Chen et al. 2009). During fieldwork in Pingnan County, northeastern Fujian, a new species of Bulbophyllum, best placed under the section Cirrhopetalum, was found and described below.

Materials and methods

Gross morphological data were obtained during fieldwork. Measurements, shapes, colours and other details given in the description were based on living material. The images of flowering plant were photographed with the Canon S100v digital camera. The floral anatomy was conducted under a XTL-340Z stereomicroscope.

Taxonomy

Bulbophyllum pingnanense J.F. Liu, S.R. Lan & Y.C. Liang, sp. nov.

Figs 1, 2

Type

China. Fujian: Pingnan County, Shuangxi Town, on rock along Yuanyan River, 800–900 m, 27°01'N, 119°05'E, 23 June 2013, J.F. Liu 201312 (holotype: FAFU!; isotype: NOCC!).

Diagnosis

Bulbophyllum pingnanense is similar to B. brevipedunculatum T.C. Hsu & S.W. Chung and B. albociliatum (T.S. Liu & H.Y. Su) K. Nackejima. It differs from B. brevipedunculatum by having a longer dorsal sepal with either an obtuse or an acute apex and longer white ciliate on margins; longer and lanceolate lateral sepals; and glabrous lip. It can be distinguished from B. albociliatum by its shorter inflorescence, a longer dorsal sepal with either an obtuse or an acute apex.

Description

Epiphytic herb. Rhizome creeping, slender, 0.6–1 mm in diam. Pseudobulbs 0.6–2.5 cm apart on rhizome, obovate-elliptic, 0.5–1.7 cm, 3–6 mm in diam., with a terminal leaf. Leaf sessile; blade oblong to linear-oblong, 1.8–6.6 × 0.6–1.2 cm, apex obtuse to retuse. Scape arising from base of pseudobulb, ca. 1.1 cm, umbel 3–5 flowered; peduncle slender, ca. 0.6 mm in diam., with 3 or 4 sheaths; floral bracts triangular, 2–3 mm. Pedicel and ovary ca. 4 mm. Flowers orange red. Dorsal sepal concave, ovate, abaxially papillose, ca. 5 × 3 mm, margins long white ciliate, apex obtuse or acute; lateral sepals lanceolate, abaxially papillose, 10–12 × ca. 2 mm, slightly twisted near the base, with their upper and lower edges often loosely adhering, margins glabrous, apex acute. Petals ovate, 2.7–3.0 × 1.2–2.0 mm, margins long white ciliate, apex rounded. Lip recurved, ovate-triangular, ca. 3 mm, abaxially deeply grooved, base attached to end of column foot by a mobile joint. Column yellow, subterete, ca. 1–2 mm, with a distinct foot, ca. 1.0–2.5 mm, conspicuously winged; stelidia triangular, slender; anther cap subglobose; pollinia 4, in 2 pairs, without appendages.

Figure 1.

Bulbophyllum pingnanense sp. nov. A plant B flower C dorsal sepal D lateral sepal E petal F lip G pollinia and anther cap H lip, column, pedicel and ovary, side view (Drawn from the holotype by Bi-Dan Lai).

Figure 2.

Bulbophyllum pingnanense J.F. Liu, S.R. Lan & Y.C. Liang. A habitat and habit B–D flower E dorsal sepal F lateral sepal G petal H lip I lip, column, pedicel and ovary, side view J pollinia and anther cap.

Distribution and habitat

Bulbophyllum pingnanense is so far only known within Pingnan, Fujian, China (Fig. 3). It is epiphytic on steep rock in the edge of evergreen coniferous and broad-leaved mixed forest, which is mainly composed of Castanopsis eyrei (Champ. ex Benth.) Hutch. (Fagaceae), Cunninghamia lanceolata (Lamb.) Hook. (Taxodiaceae). Other orchids, Amitostigma gracile (Bl.) Schltr., Pholidota cantonensis Rolfe, Cymbidium floribundum Lindl. and Pleione formosana Hayata, were found growing nearby this new species.

Figure 3.

Distribution of Bulbophyllum pingnanense, B. brevipedunculatum and B. albociliatum.

Phenology

Flowering from June to July.

Conservation status

Bulbophyllum pingnanense is known only from the type locality, and only one population of ca. 3000 individual plants was discovered in a small area of ca. 0.002 km2 during two years of botanical surveys. Based on the extent of occurrence estimated to be less than 100 km2 (CR B1) and the area of occupancy less than 10 km2 (CR B2), species existing at a single location (CR B1a + B2a), B. pingnanense is assigned a preliminary status of Critically Endangered (CR B1a + B2a) according to the IUCN Categories and Criteria (IUCN 2012). In addition, the plants of Bulbophyllum are used as herbal medicine in the locality. It is possible that B. pingnanense might also be collected for using as herbal medicine. Therefore, immediate conservation strategy should be taken.

Etymology

The species epithet refers to Pingnan County where this new species was found.

Taxonomic notes

Several morphological characters, such as the dorsal sepal being much shorter than the lateral sepals, and the lateral sepals twisting and connected, indicate that this species belongs to sect. Cirrhopetalum. Bulbophyllum pingnanense is closely related to B. brevipedunculatum, but it can be distinguished by having a longer (ca. 5 mm vs. ca. 3.5 mm) dorsal sepal with either an obtuse or an acute (vs. rounded) apex and longer white ciliate (vs. short white ciliate) on margins, longer (10–12 mm vs. 5–7 mm) and lanceolate (vs. near rectangular) lateral sepals, glabrous (vs. adaxially papillose) lip. In addition, the two species had different flowering seasons that never overlapped (June–July vs. March–April), and the nearest distance between them is ca. 370 km, separated by the sea (Fig. 3). The new species is also closely related to B. albociliatum, but it can be distinguished by having a shorter (ca. 1.1 cm vs. 4–6 cm) inflorescence, and a longer (ca. 5 mm vs. 3–4 mm) dorsal sepal with either an obtuse or an acute (vs. rounded) apex; the nearest distance between the two species is ca. 350 km, separated by the sea (Fig. 3).

1 Scape ca. as long as pseudobulb 2
Scape much longer than pseudobulb 4
2 Lateral sepals near rectangular, 5–7 mm long, ca. 2 × as long as dorsal sepal or shorter B. brevipedunculatum
Lateral sepals narrowly oblong or lanceolate, ca. 10 mm long, ca. 2 × as long as dorsal sepal or longer 3
3 Scape ca. 4 mm, sepals yellow, lip triangular-lanceolate B. henanense
Scape ca. 11 mm, sepals orange red, lip ovate-triangular B. pingnanense
4 Adaxial surface of lip glabrous, lateral sepals 0.7–1.1 cm B. albociliatum
Adaxial surface of lip partly papillose, lateral sepals 1.2–1.4 cm B. kuanwuense

Acknowledgements

We would like to thank Ms Bi-Dan Lai for the line drawing, Xiaohua Jin and Shihwen Chung for helpful comments on the manuscript. This work was financially supported through grants from the Innovation and Industrialization Projects of Seedling of Fujian Province (Grant No. 2014S1477-7).

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