台灣植物誌 第二版 Flora of Taiwan, 2nd edition Vol. 1
13. DICKSONIACEAE 蚌殼蕨科
DEVOL CHARLES E. and SHIEH, WANG-CHUENG
Tree ferns with tall stout trunks or prostrate rhizomes, covered with a mass of hairs; stipes not articulate to rhizome. Fronds large, tripinnatifid; veins free. Sori marginal or submarginal, terminal on veinlets; indusia 2 lobed, outer lobe a continuation of the leaf margin and bent at about right angles to leaf surface; sporangia gradate, annulus complete, oblique; paraphyses abundant. Spores trilete.
A family of 4 genera and about 40 species, mainly in tropical regions, one in Taiwan.
1. CIBOTIUM Kaulf. 金狗毛蕨屬
Rhizome prostrate or erect; base of stipe and rhizome covered with a mass of long hairs. Fronds deeply tripinnatifid. Sori with indusia of two equal or unequal lobes.
A genus of about 10 species found in SE Asia, Hawaii and Central America, two in Taiwan.
Chen, S. H. & T. C. Huang 1974. Spore Morphology of Formosan Pteridaceae, Taiwania 19(2): 195. pl. 3, f. 4-5.
Gastony, G. J. 1982. Spore morphology in the Dicksoniaceae. II. The Genus Cibotum. Can. Journ. Bot. 60: 955-972.
KEY TO SPECIES
1. Spores with equatorial ridge; pinnules on either side of rachillae of the lower pinnae of about equal length; pinnule lobes with several pairs of sori… 1. C. barometz
1. Spores without equatorial ridge; pinnules on acroscopic side of rachillae of the lower pinnae much longer than those on the basiscopic side; pinnule lobes with only 1 or 2 pairs of sori… 2. C. cumingii
1. Cibotium barometz (L.) J. Sm. In Lond. Journ. Bot. 1: 437. 1842; DeVol in Fl. Taiwan 1: 131. 1975. 金狗毛蕨 Pl.53
Polypodium barometz L., Sp. Pl. 2: 1092. 1753.
Rhizome stout, prostrate; stipe and rachis green, turning purplish beneath (with age); with a continuous or broken row of linear aerophores on each side of stipe, base of stipe covered with a mass of long (1.0-1.5 cm) shiny brown hairs, upper part of stipe and rachis covered with small, appressed flaccid hairs becoming glabrescent; c. s. of stipe with a long linear 3-lobed, wavy bundle. Fronds tripinnatifid, 1.5-3 m long; glaucous beneath, pinnae stalked, medial pinnae 40-80 cm long, lower pinnae shortened, deflexed; pinnules short stalked, usually of about equal length on either side of rachilla; ultimate segments apiculate, margins serrulate-serrate; veinlets free, fertile ones simple, sterile often once forked. Sori of several pairs on pinnule lobes; indusia outer lobe usually larger. Spores with equatorial ridge annulate or annulotrilete; exine with proximal face bearing 3 rows of short laesural ridges, distal face with a distal ridge.
Distributed in India, Southeast Asia to Indonesia and the Philippines, rare in Taiwan.