作 者 ：DU Gui-Sen, WANG Mei-Zhi, ZHANG Yu-Long
期 刊 ：植物分类学报 1998年 5期
Keywords:Bryum, Spore morphology,
Abstract:
Spore morphology of thirteen species of the genus Bryum Hedw. were observed
by LM and SEM. The results show that the ornamentation of spore exine could be divided
into three types: Type I , blunt at the top of baculate processes, to which four species be-
long: Bryum argenteum, B. lonchocaulon , B. uliginosum and B. arcticum. Type Ⅱ,
sharp or with small processes at the top of baculate processes, represented by seven species:
B. pallescens, B. caespiticium, B. pallens, B. pseudotriquetrum, B. paradoxum, B.
alpinum and B. thomsoii. Type Ⅲ, expanded into hemispherical-shaped at the top of bac-
ulate processes, represented by two species: B.coronatum and B.sauteri. The
Bryum species may also be divided into three groups according to the variation of spore diam-
eter. Group I , with spore diameter under 10 μm, including one species, B. uliginosum.
Group Ⅱ, with spore diameter 11～20 μm, including seven species: B. argenteum, B.
alpinum, B. coronatum, B. pallens, B.paradoxum, B.sauteri, B.thomsonii.
Group Ⅲ, spore diameter 21～30 μm, with five species: B. pallescens, B. caespiticium,
B. pseudotriquetrum, B. lonchocaulon, B. arcticum. There are resemblances of spore
morphology and exine ornamentation among the thirteen species. In the view of palynology,
the genus Bryum is a natural taxon which is more advanced than the genus Pohlia Hedw.
But spores of thirteen species are different at some characters such as diameter, shape of
proximal leptoma, etc., which indicates the genetic differentiation in the genus Bryum.