林業研究季刊 28(3)：25-28, 2006 25

研究報告 台灣蘭科新種植物－台灣擬囊唇蘭

鐘詩文 1 許天銓 2 Tomohisa Yukawa 3, 4

【摘要】台灣擬囊唇蘭 (Saccolabiopsis taiwaniana) 是台灣的的蘭科新種植物。這植物目前僅被記 錄在南台灣的一個地點。擬囊唇蘭屬是台灣蘭科的新屬。本報告除提供本種的形態描述和線描圖 外，並提供它們的分布、生態及分類處理等資料。 【關鍵詞】台灣擬囊唇蘭、蘭科、新種、台灣、稀有植物

Research paper Saccolabiopsis taiwaniana (), a New Species from the Taiwan

Shih-Wen Chung1 Tien-Chuan Hsu2 Tomohisa Yukawa 3, 4

【Abstract】Saccolabiopsis taiwaniana, a new orchid species from Taiwan, is described and illustrated. The new species is rare and recorded from one locality in southern Taiwan. Saccolabiopsis is also a new that will be added to the Orchidaceae in Taiwan. This study gives the morphological description and line drawings of the species. In addition, their distribution, ecology and are provided. 【Key words】Saccolabiopsis taiwaniana, Orchidaceae, new species, Taiwan, rare .

INTRODUCTION have only the same species (Comber, 2001). J. J. Smith proposed the genus Saccolabiopsis small, stems short, leaves few. Inflorescences in 1918 based on the one species found in Java and perforating two sheathes, sometimes with a few Sumatra, and since then 12 other species have been branches, many-flowered. Flowers small, facing in placed in it. Distribution of the genus is now all directions, lasting several days, and interpreted to range from the in the free, quite similar, oblong. Lip inserted at the west to New Guinea and Australia in the east. base, not movable, spurred, vaguely There is one species in Thailand, and none in trilobed, concave, slender, without any calli, the Peninsular Malaysia or Borneo. Java and Sumatra side lobes very short and broad, scarcely separated

1.行政院農業委員會林業試驗所生物組 Division of Forestry Biology, Taiwan Forestry Research Institute. 2.國立台灣大學生態學與演化生物學研究所. Institute of Ecology and Evolutionary Biology. 3.國立科學博物館筑波植物園. Tsukuba Botanical Garden, National Science Museum, Amakubo, Tsukuba, 305-0005, Japan 4.通信作者 Corresponding author. 26 台灣蘭科新種植物：台灣擬囊唇蘭 from the mid-lobe. Column short, without a foot, examination, we found the floral morphology of anther hooded. Pollinia four, very unequal, the the specimens is different from any of the species stipes rather short, the stigma large. described in this island or in Asia (Comber, 2001; The above was J. J. Smith’s description of Dockrill, 1992; Holttum, 1964). Consequently we Saccolabiopsis, with which the newly collected described it as a new species and the description of specimens generally agreed. After careful which is as follows.

Fig. 1. Saccolabiopsis taiwaniana S. W. Chung, T. C. Hsu & T. Yukawa 1: Habit. 2, 3: Different views of flower. 4: Bract. 5: Dorsal . 6: . 7. Lateral sepal. 8: Lip, front view. 9: Lip, side view 10, 11: Different views of column. 12: Column with anther removed. 13, 14: Different views of column with pollinia removed. 15, 16: Different views of anther-cap. 17: Different views of pollinia.

林業研究季刊 28(3)：25-28, 2006 27

TAXONOMIC TREATMENT alt. 400-450 m, 2006, April 11, Chung & Hsu Saccolabiopsis taiwaniana S. W. Chung, T. 10099, not common, in broad-forest forests, C. Hsu & T. Yukawa. sp. nov.—Type: Pingtung: epiphytic on Beilschmiedia tsangii , pathside, Hengchun Peninsula , Manzhouxiang (滿州鄉), highly humidity, semi-shaded (TAIF).

台灣擬囊唇蘭 Figures 1-2. Fig. 2. Saccolabiopsis taiwaniana S. W. Chung, T. C. Hsu & T. Yukawa, showing 1: Habit. 2,3,4: Flower. 5: Habit and inflorescence.

28 台灣蘭科新種植物：台灣擬囊唇蘭

Herba epiphytica. Folia oblanceolata, apice genus. It is most closely related to S. tenella, which acuta vel mucronato-acuta, margine integra, distributes in Leyte and Mindanao, Philippines. I utrinque viridian et glabra, 1.3-2.0 cm longa, 9-11 have investigated its protologue and associated mm lata. Sepala subaequalia, libera, patentia, figure. Both materials are rather obscure but can be obovato-oblomga, apice acuta. Labellum concave. distinguished from Taiwanese plant by the shape of Polina 4, globosa. spur and side lobe of lip. Stems short, bearing about 3-5 leaves. Roots Furthermore, this species is like Smitiinandia rather few, about 1 mm diam. Leaves obliquely in its shape of flower and large anther, but with lanceolate, obtusely bilobed, coriaceous, generally small-sized plants (vs. medium-sized plants), lip pale green in colour, 1.3-2.0 cm long, 0.4-0.7 cm entire (vs. trilobed), concave (vs. saccate), stipe wide. Inflorescences racemose, about 4 cm, more or less lorate although somewhat dilated at curved, many flowered, peduncle generally shorter the distal end (vs. triangular). than the rhachis; rhachis about 1.0 mm thick, thickest at about the middle, bearing 13-19 flowers Literature Cited on pedicels. Flowers about 3.0 mm diam., widely Comber J. B. (2001) Orchids of Summatra. Royal opening, tepals slightly incurved, translucent Botanic Gardens, Kew, England. p. 38. green, labellum white, anther yellowish. Dorsal Dockrill, A. W. (1992) Australian Indigenous sepal about 2 mm long, 0.8 mm wide, oblong- Orchids. 2nd ed. Chipping Norton, New ovate. Lateral sepals similar to the dorsal sepal. South Wales: Surrey Beatty & Sons in Petals similar to the lateral sepals in shape association with Society for Growing although slightly shorter than them. Lip about 2 Australian Plants. pp. 895-897. mm long, 0.7 mm wide, entire, without trilobed, Holttum R. E. (1964) Flora of Malaya. Vol. 1. comparatively large, broadly triangular, obtuse, Government Printing Office, Singapore. pp. concave. Column about 0.7 mm long, with narrow 735-736. wings near the apex. Stipe twice as long as a polonium, more or less lorate although somewhat dilated at the distal end. Pollinia four in two closely appressed unequal paris. Capsules linear- cylindrical, about 1.5 cm.

Discussion The figure and size of plant body, corolla and pollinia of this species match the characteristics of Saccolabiopsis. Nevertheless, lip without lobe, slightly concaving and no sac or spur, are different from known species of Saccolabiopsis which all have trilobed lip and downward extending spur. With respect to Saccolabiopsis, we have checked all the relevant species belonging to the