作 者 ：He Xiao-Lan, Aur Chih-Wen
期 刊 ：植物分类学报 1991年 2期
关键词：泥炭藓属祖征衍征种系发生Wagner平面分异法；
Keywords:Sphagnum, plesiomorphy, apomorphy, phylogenesis, Wagner GPD method,
Abstract:
This paper deals with the phylogenetic relationships in Sphagnum using the
Wagner Groundplan-Divergence method. The main principle of the Wagner GPD method
is grouping based on synapomorphy derived from outgroup comparison and ontogenetic
analysis whenever possible. We make use of 21 available characters from gametophytes, es-
timate plesiomorphic conditions on the principle that characters found in the group under
study and in most or all members of related groups are plesiomorphic, while those found only
within the group are apomorphic, and finally arrange taxa according to shared derived fea-
tures. In the Wagner tree diagrams, all characters can be placed on a Wagner tree so that the
various relationships in the genus Sphagnum can be visualized. The results were as follows:
1. The genus Sphagnum can be divided into six sections, i.e. Sphagnum, Squarrosa,
Acutifolia, Cuspidata, Subsecunda and Polyclada. They are almost consistent withe those de-
rived from classical and numerical taxonomy of Sphagnum.
2. In Wagner tree diagrams, Section Sphagnum and Sect. Squarros were branched earli-
er, so they are primitive and the other four sections were last branched, so they are
derived. Sphagnum magellanicum is a rather primitive species, whereus S. girgensohnii and
S. fimbriatum are rather advanced ones in the 14 species of Sphagnum investigated.