A Record of Hart’s-Tongue Fern（ Asplenium scolopendrium L.） Inhabiting Holes in Concrete Armor Blocks on the Coast of Southern Hokkaido, Japan

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  • 道南地域の海岸消波ブロックの穴に生育しているコタニワタリ（Asplenium scolopendrium L.）の記録

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Hart’s-tongue fern （Asplenium scolopendrium L.), a species usually found in mountain forests, was recorded in the bottom of holes in armor blocks on a coastal sandy beach of southern Hokkaido, Japan. The location was Omonai, Shiriuchi-cho, Kamiiso-gun, Hokkaido, where many concrete blocks with vertical holes have been lined up in 10 rows. The largest number of individuals was identified on the land side row. Four other ferns （Athyrium sinense, Dryopteris crassirhizoma, Equisetum arvense, and Polystichum retrosopaleaceum） were also identified in the same type of holes at this site. Asplenium scolopendrium, Athyrium sinense, D. crassirhizoma, and P. retrosopaleaceum are forest floor ferns. The depth of the holes where these ferns grew was approximately 60 cm, and the crosssectional area of the holes was approximately 60 cm×18 cm. Typically, only shadeintolerant species, such as ruderals or coastal grass species, can grow on sandy beaches, and immigration of forest floor ferns is difficult. However, the holes in the blocks created rockshade- like environments and formed a microhabitat for these species. Installation of such concrete blocks could be useful for the conservation of A. scolopendrium in areas where this species is endangered.

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