Journal Article Phenology of Racomitrium lanuginosum growing at a seasonally snow-covered site on Mt. Fuji, Japan

10 ( 4 )  , pp.497 - 502 , 2016-12
ISSN:18739652
Description
We investigated the seasonality of the development of the gametangia and sporophytes of Racomitrium lanuginosum growing at a seasonally snow-covered site (ca. 2200 m altitude) on Mt. Fuji, Central Honshu, Japan. Shoots of R. lanuginosum were collected every 2 weeks during the snow-free period (June–November) in 2014. The number of inflorescences and the numbers, sizes, and developmental stages of the male and female gametangia and sporophytes were recorded. Archegonia developed quickly in early spring, but antheridia took longer to develop from the previous summer. Fertilization occurred in June and July and spore dispersal occurred in June of the following year. The archegonia took 1 month to mature, the antheridia took 7–10 months, and the sporophytes took 10 months. The development of the antheridia and sporophytes stopped during the winter when the study site was covered by snow.
積雪のある地域の蘚苔類のフェノロジーパターンを明らかにするために、富士山の標高2200 m付近に生育するシモフリゴケRacomitrium lanuginosumのフェノロジーを調べた。サンプリングは2014年の無雪期に2週間に1回行い、花序の形成数と配偶子嚢と胞子体の形成数、サイズ、発達段階を測定した。造卵器は春期の1ヶ月間で発達を完了し、造精器は積雪期をはさんだ7~10ヶ月間という比較的長い発達期間を示した。受精は初夏に起こり、胞子体は造精器と同じく積雪期をはさんだ10ヶ月という発達期間を示した。造精器と胞子体は積雪下では発達を休止していることも明らかになった。

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