(9) 華南長筒蕨（廣西長筒蕨）
Selenodesmium siamense (Christ) Ching & C. H. Wang
膜蕨科（Hymenophyllaceae）

英文名 (English name): Siamense Selenodesmium

中國境內現狀: 需予關注(LC)
Status in China: Least Concern (LC)

形態特徵：多年生草本。根狀莖短，橫走或直立，無毛，有多數粗根。葉簇生；葉柄長3-10毫米，無毛，近頂端有狹翅；葉片長卵圓形至三角形，通常長10-12厘米，二回或三回羽狀分裂；羽片3-5對，互生或近對生，長卵圓形，無柄，羽軸有狹翅；小羽片羽狀細裂；末回裂片細長，線形。孢子囊群生於小羽片的基部裂片上；囊群蓋筒狀，口部幾不擴大和分裂；囊群托長而突出，彎曲，黑褐色。

地理分布：香港島、大帽山、大埔滘、深涌。廣東、廣西、海南；越南、泰國。

生境與生態：生於山谷林下終年流水潺潺的潮濕處。

本種為稀有種, 具有科學研究價值。在香港，其部分生長地點在郊野公園內而受到保護。

Description: Perennial herbs. Rhizome short, creeping to erect, glabrous, with many stout roots. Leaves tufted; stipes 3-10 cm long, glabrous, narrowly winged near apex; lamina oblong-ovate to triangular, generally 10-12 cm long, bi- or tripinnate; pinnae 3-5 pairs, oblong-ovate, sessile; rachis narrowly winged; pinnules pinnately dissected, segments linear. Sori borne on the basal segments of the pinnules, indusium cylindrical, mouth hardly dilated and lobed; receptacle protruding, curved, dark brown.
　　

Distribution: Hong Kong Island, Tai Mo Shan, Tai Po Kau, Sham Chung. Hainan, Guangdong, Guangxi; Vietnam and Thailand.
　　

Habitat and Ecology: In valleys, especially on wet places with dripping water.

It is a rare species of value in scientific research. In Hong Kong, some localities of its occurrence are in Country Parks under protection.

參考文獻 (References)：
秦仁昌，1959: 中國植物誌2: 191，圖版15：6-7。科學出版社，北京。