Abstract
The polysety of Pogonatum fastigiatum Mitt., Rhodobryum ontariense (Kindb.) Kindb., Mnium spinosum (Voit) Schwaegr. and Rhizomnium magnifolium (Horik.) T. Kop. was studied based on the Chinese materials. In Pogonatum fastigiatum, over 90 % of the fertile shoots were monosetous, though one shoot with three setae was present. In Rhodobryum ontariense, the number of setae in a shoot varied from one to five, and one appears to be the most common. Very few shoots had more than three setae. In Mnium spinosum, about 80 % of the fertile shoots were polysetous. More than two setae were found on about 50 % of the shoots. In Rhizomnium magnifolium, the number of setae in a shoot varied from one to four, and one appears to be the most common. The population from Sichuan Province showed a higher degree of polysety than that of Yunnan Province.
