P. terrestris

P. terrestris may refer to:
 * Pedilochilus terrestris, an orchid species in the genus Pedilochilus
 * Phaeotrichoconis terrestris, a plant pathogen species
 * Phyllastrephus terrestris, a songbird species
 * Phytophthora terrestris, a water mould species
 * Pseudotetracystis terrestris, an alga species in the genus Pseudotetracystis
 * Pyrenochaeta terrestris, a fungal plant pathogen species