These data are useful not only in general aspect of orchid biology and plant–microbial interactions, but also in practical application in orchid seed propagation in vitro. First attempt of bacterization of the orchid seeds was made by Knudson (1922), and later, by Wilkinson et al. (1994a). Recently we have demonstrated that bacterization of the orchid seeds of different epiphytic and terrestrial species (Dendrobium, Paphiopedilum, Ponthieva, and Dactylorhiza genera) with Bacillus strain, originally isolated from Dendrobium leonis (Lindl.) Rchb., significantly stimulated orchid germination and development ( Kolomeitseva et al., 2006). This symbiotic in vitro germination, taking place in the full absence of mycorrhizal fungus or any of plant growth regulators can find its application in orchid propagation.