Chromosome numbers of 13 species in the genus Dryopteris (Dryopteridaceae) from Yunnan, China

Chromosomes of 13 species in the genus Dryopteris Adanson (Dryopteridaceae) from Yunnan, China have been counted. The numbers in four species, D. alpestris Tagawa (2n=82), D. habaensis Ching (2n=82), D. lachoongensis (Bedd.) Nayar & Kaur (2n=82), and D. yungtzeensis Ching (2n=82), were reported for the first time. The triploid apomict D. rosthornii (Diels) C. Chr. (2n=123), the tetraploid apomict D. wallichiana (Spreng.) Hylander ('n'=164, 2n=164) and the diploid apomict D. yoroii Serizawa (2n=82) represent three new cytotypes. Our results support the establishment of the section Caespitosae S. G. Lu, and indicate a high percentage of the diploid apomict cytotype in Dryopteris from the Himalayan region of China. The phenomenon of the presence of different cytotypes in a same plant of fern species is discussed.

[1]  Masahiro Kato,et al.  Diploid and triploid offspring of triploid agamosporous fernDryopteris pacifica , 1992, The botanical magazine = Shokubutsu-gaku-zasshi.

[2]  Masahiro Kato,et al.  Cytotaxonomic study of ferns of Yunnan, southwestern China , 1992, The botanical magazine = Shokubutsu-gaku-zasshi.

[3]  C. Fraser-Jenkins.  New Species Syndrome in Indian Pteridology and the Ferns of Nepal , 1997 .

[4]  M. Gibby,et al.  Phloroglucinol derivatives in Dryopteris sect. Fibrillosae and related taxa (Pteridophyta, Dryopteridaceae) , 1996 .

[5]  C. Fraser-Jenkins.  A monograph of Dryopteris (Pteridophyta: Dryopteridaceae) in the Indian subcontinent , 1989 .

[6]  Xia Qun,et al.  Cytological Observations on Some Species of Dryopteris and Polystichum from China , 1984 .

[7]  Chiu Pei-Shi.  Observations on the chromosome numbers of Chinese ferns , 1981 .

[8]  Zhang Zhi-xian,et al.  Cytological Observation on Some Chinese Ferns , 1981 .

[9]  W. H. Wagner,et al.  Polyploidy in pteridophytes. , 1979, Basic life sciences.

[10]  J. D. Lovis,et al.  Evolutionary Patterns and Processes in Ferns , 1978 .

[11]  W. H. Wagner,et al.  Cytogeographic studies on Dryopteris of Japan , 1975 .

[12]  R. Lloyd,.  Facultative Apomixis and Polyploidy in Matteuccia orientalis , 1973 .

[13]  T. Walker.  5.—Additional Cytotaxonomic Notes on the Pteridophytes of Jamaica , 1973, Transactions of the Royal Society of Edinburgh.

[14]  P. Mehra,et al.  Cytological Investigations in the Himalayan Dryopteris Adanson , 1965 .

[15]  I. Manton.  Book Reviews: Problems of Cytology and Evolution in the Pteridophyta , 1951 .

[16]  Wang Zhong-ren.  Three New Cytotypes of Dryopteris chrysocoma Complex , 1900 .

[17]  Weng Ruo-Fen.  Cytological Observations on Some Chinese Ferns , 1900 .