Seed plants all have flagellated sperm

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Cycads, like all seed-producing plants, have a dominant diploid sporophyte phase in their life cycle—this is the large, familiar, green plant seen in nature. Cycads and other gymnosperms do not have true flowers and their seeds are borne naked. In the more evolutionarily recent angiosperms flowering plants , the seed is enveloped by a coat or fruit which originates from the ovary. All species of cycads are dioecious, meaning the male and female reproductive structures are borne on separate plants. The male reproductive structure, known as an androstrobilus, superficially looks like a large pine cone, though it is much simpler in structure.
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Plants III - Seed Plants (Non-Flowering and Flowering) - BIOLF - Confluence

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Introduction and Learning Objectives

Sperm is the male reproductive cell. In the types of sexual reproduction known as anisogamy and its subtype oogamy , there is a marked difference in the size of the gametes with the smaller one being termed the "male" or sperm cell. A uniflagellar sperm cell that is motile is referred to as a spermatozoon , whereas a non-motile sperm cell is referred to as a spermatium. Sperm cells cannot divide and have a limited life span, but after fusion with egg cells during fertilization, a new organism begins developing, starting as a totipotent zygote.
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