8) 華南瘤足蕨
Plagiogyria tenuifolia Cop.
瘤足蕨科 （Plagiogyriaceae）

英文名 (English name): Tumor-footed Fern

中國境內現狀: 瀕危 (EN).
Status in China: Endangered (EN).

形態特徵：多年生草本。根狀莖短，直立。葉柄簇生，長0-25厘米，基部稍膨大，橫切面為三角形；葉片一次羽狀分裂，二型：不育葉長圓形，長15-20 厘米，寬約10厘米；羽片約20對，先端銳尖有鋸齒，基部與葉軸之翅匯合，基部一對稍縮短，略下斜；葉脈分叉，兩面均明顯。能育葉比不育葉高，羽片遙小，長約2.5厘米，寬2-3毫米，下面密生孢子囊。

地理分布：馬鞍山、大東山、香港島。台灣也有分布。

生境與生態：生於山頂次生林中潮濕的處。

本種模式標本採自香港，首次於1907年在馬鞍山的山澗發現，間斷分布於香港、台灣兩地，其分布式樣有學術意義。因分布區分散及其個體甚少而受威脅。香港的生長地點多位於郊野公園內而受到保護。

Description: Perennial herbs. Rhizome short, erect. Stipes crowded,10-25 cm long, base slightly enlarged, triangular in transverse section. Lamina simply pinnate, dimorphous: sterile lamina oblong, 15-20 cm long and 10 cm wide; pinnae about 20 pairs, apex acute and serrate, base adnate to the rachis wing; the lowest pair somewhat reduced and deflexed; veins forked, prominent on both surfaces; fertile lamina taller than the sterile ones; pinnae much reduced, about 2.5 cm long and 2-3 mm wide, densely covered with sporangia on lower surface.

Distribution: Ma On Shan, Sunset Peak and Hong Kong Island. Taiwan.

Habitat and Ecology: On moist places in secondary forests of mountain ridge.

First discovered in shaded crevices in Ma On Shan in 1907, this species is a rare species discontinuously distributed in Hong Kong (type locality) and Taiwan and is thus of special botanical interest. The distribution range of this species is fragmented and its population size is small, but most localities of its occurrence in Hong Kong are protected in Country Parks.

參考文獻 (References)：
秦仁昌，1959。 中國植物誌2: 104。科學出版社，北京。
Edie, H. H., 1977: Ferns of Hong Kong, 90. Hong Kong Univ. Press, Hong Kong.
Copeland, E. B., 1908: Philippine Journal of Science 3(5): 281.