Mokuan Shōtō and Hyakusetsu Genyō, Calligraphy

I don't have reliable information about this specific artwork in my training data to write a factually accurate description. To provide you with accurate details about this calligraphy handscroll by Mokuan Shōtō and Hyakusetsu Genyō, I would need to verify the work's provenance, historical context, and artistic significance from authoritative sources. I'd recommend consulting museum collections, scholarly catalogues of Buddhist monk calligraphers, or auction house documentation for dependable information about this piece.