日本産蘚類の矮雄

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A review of the dwarf male plant for Japanese mosses was prepared to explain the background ofthe establishment of Japanese moss flora，to gether with the updating ofthe information. The results inc1ude: 1) the dwarf male plant is confirmed to occur in61species among the 1，135 Japanese moss species (5.4%)， 2) the occurrence of thedwarf male plant is limited to the Bryidae，but never in such primitive groups asSphagnidae， Andreaeidae， and Takakiidae， 3) the majority of the species nest inDicranales and Hypnobryales in Bryidae，4) dwarf male plants grow in particulargrowing positions (1eaves，branches，stems，leaf-axiles，tomenta) on female plants，thepreference ofwhich varies according to species，5) anisospory is observed in a limited number of species such as Macromitrium and Schlotheimia，6) in such isosporous species forming both dwarf and normal male plants as Macromitrium japonicum and M gymnostomum，the occurrence of normal male plants is confined to the regions oflower altitudes and latitudes，in c1uding SW Honshu，Kyushu and Ryukyus，while thedistribution range of dwarf male plants is wider，ex tending to central Japan，7) dwarfmale formation can be considered to be genetically controlled for the anisosporousspecies，but physiologically so for the isosporous species being induced by hormonalsubstances from female plants，and 8) the new terms of the sexuality being offered;eunanandrous being the sexuality of which the dwarfness of male plants being genetically controlled，and pseudonanandrous being the sexuality of which the dwarfmale forτnation being physiologically induced by hormonal substances.
広島植物学研究会の論文

日本産蘚類の矮雄

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