Callogenesis is a prerequisite step for the initiation of callus-mediated plant regeneration. Three-month-old protocorms of Dendrobium crumenatum Swartz (pigeon orchid) were bisected transversely and cultured on modified Vacin and Went (VW) solid medium containing 20 g L-1 sucrose. 2 g L-1 Phytagel added with various concentrations of 1-naphthaleneacetic acid (NAA) (0. 0. https://allfixelectricales.shop/product-category/tub-to-pump-hose/