A picture of this non-registered
cultivar was shown as part of an article by June Colley
The British Hosta and Hemerocallis Society Journal
(Autumn 2019). It was noted as a plant with yellow-green
flowers. She took the picture while on a recent trip to
explore hostas in Japan.
Mikiko Lockwood in an article on The Hosta Library titled,
A Little About Japanese Hosta Terms defines the term maruba
as round leaf or round-leafed and the term shirobana as white flower.