See: forma specialis. Fi, F2, etc.

The letter 'F' stands for 'filial' and refers to the generation. Thus F1 is the first generation (sons), F2 is the second generation (grandsons), and so on, following the cross of two parents, that are labelled P. This nomenclature is used mainly with autogamous crops and refers to the self-pollinating generations that follow cross-pollination. Facultative parasite

A parasite that is able to extract nutrients from both a living plant host, and from dead plant material. See also: Obligate parasite.

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