Genus Phoma was described by Saccardo in Sphaeropsidales, Fungi Imperfecti. Species of this genera were characterized by hyaline, 1-celled conidia produced in pycnidia on stems and twigs of plants. For years species of Phoma were identified based on morphological characters studied earlier only in vivo but later also in vitro on 3 standard media. Because of morphological diversity of species identified as Phoma by the end of the 20. century taxonomists divided this genera into 9 sections. Carried out phylogenetic studies of species typical of all sections revealed that they belonged to order Pleosporales, but to 3 different families. It was found that the number of genera distinguished recently from Phoma was higher than the number of sections described earlier. Based on phylogeny and morphological characters of species belonging earlier to the sections of Phoma new genera were distinguished and characterized. Among them are taxons described for the first time, e.g. Boeremia, and genera for which names were given earlier, e.g. Plenodomus (renamed one) as well as Phoma sensu stricto. Key and descriptions of these genera have been provided.

Saccardo przyporządkował rodzaj Phoma do Sphaeropsidales w Fungi Imperfecti. Jego gatunki charakteryzowały się wytwarzaniem hialinowych, jednokomórkowych zarodników konidialnych, które tworzyły się w piknidiach na pędach lub gałązkach roślin. Przez dziesiątki lat opisywano gatunki Phoma na podstawie cech morfologicznych badanych początkowo tylko in vivo, a następnie także in vitro na 3 standardowych pożywkach. Zróżnicowanie morfologiczne gatunków Phoma doprowadziło do wyróżnienia 9 sekcji w tym rodzaju. Przeprowadzone wkrótce badania filogenetyczne gatunków typowych wszystkich sekcji wykazały, że należały one do rzędu Pleosporales, ale do 3 różnych rodzin. Wykazano, że liczba rodzajów wyróżnionych ostatnio z Phoma przewyższa liczbę opisanych wcześniej sekcji. Na podstawie właściwości filogenetycznych i cech morfologicznych gatunków zaliczonych wcześniej do wszystkich sekcji rodzaju Phoma scharakteryzowano nowo wyłonione rodzaje. Wśród nich są taksony opisane pierwszy raz, np. Boeremia oraz rodzaje, dla których przywrócono wcześniejsze ich nazwy, np. Plenodomus, a także Phoma sensu stricto. Zamieszczono klucz do rodzajów i ich charakterystykę.

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Boerema G.H. 1993. Contribution towards a monograph of Phoma (Coelomycetes) – II. Section Peyronellaea. Persoonia 15: 197–221.

Boerema G.H. 1997. Contribution towards a monograph of Phoma (Coelomycetes) – V. Subdivision of the genus in sections. Mycotaxon 64: 321–333.

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