ほうらいしだであれば
蓬莱羊歯であれば
hōraishidadeareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of ほうらいしだ

1. If it were a maidenhair fern…; If it is a maidenhair fern…

Ba Conditional
Usually Written in Kana