• Webster's Revised Unabridged Dictionary
    • n Protophyte (Bot) Any unicellular plant, or plant forming only a plasmodium, having reproduction only by fission, gemmation, or cell division.☞ The protophytes (Protophyta) are by some botanists considered an independent branch or class of the vegetable kingdom, and made to include the lowest forms of both fungi and algæ, as slime molds, Bacteria, the nostocs, etc. Cf. Carpophyte, and Oöphyte.
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Century Dictionary and Cyclopedia
    • n protophyte A plant of the group Protophyta.
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Chambers's Twentieth Century Dictionary
    • n Protophyte prō′tō-fīt the first or lowest order of plants
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Webster's Revised Unabridged Dictionary
Proto-, + Gr. a plant
Chambers's Twentieth Century Dictionary
Gr. prōtos, first, phyton, a plant.


In literature:

The protophytes may be divided into three classes: I.
"Elements of Structural and Systematic Botany" by Douglas Houghton Campbell