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Taxa under scrutiny in this thesis are Halophytophthora-like oomycetes. The genus Halophytophthora, proposed in 1990, is an assemblage of unrelated species grouped together on the basis habitat preference, i.e. the mangrove or saltmarsh biome, and morphological similarity to Phytophthora. The premise “Phytophthora-like species from the mangrove environment” became the genus concept for Halophytophthora and lasted for almost 2 decades which resulted to the addition of several species (i.e. H. elongata, H. exoprolifera, H. porrigovesica, H. kandeliae, H. masteri, and H. tartarea). At the onset of molecular phylogenetics, Halophytophthora was inferred as a highly polyphyletic taxon and the genus concept was found to be unsuitable. This thesis adds to this, since six Phytophthora spp. were isolated from the mangrove environment, two of which were found in the Philippines (Phytophthora elongata and Phytophthora insolita). After a thorough assessment of the morphologic and phylogenetic data of taxa included in this thesis, several taxonomic novelties were introduced – a new family (Salispinaceae), a new genus (Calycofera), new species (Calycofera cryptica, Phytopythium dogmae, Phytopythium leanoi, Salisapilia coffeyi, and Salispina hoi), and new combinations (Calycofera operculata, Salisapilia bahamensis, S. elongata, S. epistomia, S. masteri, S. mycoparasitica). In addition, Salisapiliaceae and Salisapilia were emended.