An open-pollinated seedling of H. sieboldii 'Kabitan', this cultivar was registered by Bob Kuk of Kuk's Forest in Ohio in 1987. It forms a small size (10 inches high - sometimes taller) mound of long, narrow leaves that vary in color from chartreuse to medium green. August brings pale purple flowers.
 

According to The Hostapedia by Mark Zilis (2009), "...makes for an unusual specimen plant. The long narrow leaves that are rippled and serrated  have an appearance that may be unique among host cultivars. It's listed parentage is somewhat curious as it does not act like a sport of 'Kabitan' in foliage color, marginal serration, blade shape, and substance."

The New Encyclopedia of Hostas by Diana Grenfell (2009) states: "Grow with hart's tongue fern (Asplenium scolopendrium), which it closely resembles, to produce a copycat effect."

"1987 Registration: H. ‘Harts Tongue’ This was registered with incorrect parentage as [sport of H. ‘Kabitan’] It should have been [an open pollinated seedling of H. ‘Kabitan’]."