Nayak et al. (1997a,b) overcame the problem of shoot elongation in Acampe praemorsa (Roxb.) Blatter and McCann., Cymbidium aloifolium (L.) Sw., Dendrobium aphyllum (Roxb.) Fisch. and Dendrobium moschatum (Buch.-Ham.) by incorporating an auxin (NAA) at lower concentrations along with TDZ or by transferring the shoot clumps to a medium containing different phytohormones (BAP and NAA).