おうすぎごけでしょう
大杉苔でしょう
ō sugigokedeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of おおすぎごけ

1. Probably moss.; Probably *Ōsugi-goke* moss.

Polite
Presumptive
Conjecture
Usually Written in Kana