Forma specialis
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Forma specialis (plural formae speciales) is a taxonomic grouping allowed by the International Code of Botanical Nomenclature, that is applied to a parasite (most frequently a fungus) which is adapted to a specific host (there being minimal or no morphological differences); this classification may be applied by authors who do not feel that a subspeces or variety name is appropriate. An example is Puccinia graminis.Forma specialis is abbreviated f. sp.,
formae speciales is abbreviated ff. spp..
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