The study of Cheilanthes farinosa(Forsk.)kaulf. species complex in Taiwan

• Main Author: 翁茂倫
• Other Authors: 郭城孟
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/25917286133355987183

碩士 === 國立臺灣大學 === 植物學研究所 === 88 === Abstract Cheilanthes farinosa (Forsk.) Kaulf. is widely distributed in dry and rocky place of tropical and temperate region of the world. Its size is moderate to small. Because high diversity of morphology among this species, pteridologist pointed out this is a species complex and further taxonomic study is needed. There is also high diversity of the species complex in Taiwan. In the former taxonomic study, seven different scientific names have been applied. This study is to understand the phylogenetic relationship of Cheilanthes farinosa (Forsk.) Kaulf. species complex. 11 different populations from different locations are sampled and Cheilanthes argentea (Gmel.) Kunze is used to be outgroup. Morphological characters are examined, including the scale of stipe and the morphology of frond. Spore number of a sporangium is also counted. And Using the ITS of rDNA sequence data, Kimura 2-parameter distance is counted and phylogenetic tree are obtained based on UPGMA and Neighbor-Joining by MEGA package. There are two discontinuous types of scales of stipe, one is discolor and margin brown with a black line in the middle, the other is concolor brown. There are two different type of the morphology of the frond, one is oblong and the other is lanceolate. The morphological character and phylogenetic tree topologies are matched and indicated that this species complex includes two species by their longer genetic distance than the outgroup. And according to the ITS sequence, there is maybe a hybrid population in Tataka of Yu-Shan National Park. The spore number per sporangium of all samples are 64, indicate there is not apogamy among them.