There is an image of this cultivar on the Hosta Library. From the photo on the HL website, it appears to be an upright growing, large size hosta with wavy, cupped, narrow dark green leaves and creamy white marginal variegation. As the name would imply, this is a sport of H. 'Sagae'. It produces pale lavender flowers on scapes up to 50 inches tall from mid-July into August followed by viable seeds. This non-registered cultivar was originated by Theo and Marie-José Dautzenberg of the Netherlands.