The plants are further divided into calciphilious (calcium-loving), and calciphobic (calcium-hating). P.gypsicola and P.heterophylla are examples of the former, while P. colimensis, P.cyclosecta, P.ehlersia, P.esseriana, P.moranensis, P.rotundiflora, and P. zecheri are examples of the latter. The calciphilious forms appreciate high pH media (either vermiculite based, or with an addition of limestone or gypsum to the planting mix). The calciphobic species appreciate a standard, acid CP mix like peat/sand.