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Dictionary Meaning and Definition on 'Protophyta'

Protophyta Meaning and Definition from Webster's Revised Unabridged Dictionary (1913)
    Protophyte \Pro"to*phyte\, n. [Proto- + Gr. ? a plant.] (Bot.) Any unicellular plant, or plant forming only a plasmodium, having reproduction only by fission, gemmation, or cell division. Note: 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 alg[ae], as slime molds, Bacteria, the nostocs, etc. Cf. Carpophyte, and O["o]phyte.
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Wikipedia Meaning and Definition on 'Protophyta'

Plants that do not have well-differentiated body design all in this group. The plants in this group are commonly called algae. These plants are predominantly aquatic. Examples ae Spirogyra, Ulothrix, Cladophora, and Chara. The thallophytes are a polyphyletic group of non-mobile organisms traditionally described as "relatively simple plants" or "lower plants" with undifferentiated bodies (thalli). They were a defunct division of Kingdom Plantae, the Thallophyta (or Thallobionta) that included fungus and algae, and lichens occasionally bacteria and the Myxomycota.

They are sometimes referred to as "thalloid plants", as opposed to vascular plants. Stephan Ladislaus Endlicher, a 19th-century Austrian botanist, separated the Vegetable Kingdom (equivalent of Kingdom Plantae) into the Thallophytes and the Cormophytes (vascular plants) in 1836. Thallophytes were known as the Thallogens according to John Lindley, an English botanist in the ninteenth century. Likewise, Cormophytes were also known as Cormogens in the Lindley system.

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