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common name for members of the Thallophyta (or Thallobionta), a taxonomic group in some archaic classification systems that comprised algaealgae
[plural of Lat. alga=seaweed], a large and diverse group of primarily aquatic plantlike organisms. These organisms were previously classified as a primitive subkingdom of the plant kingdom, the thallophytes (plants that lack true roots, stems, leaves, and flowers).
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, fungiFungi
, kingdom of heterotrophic single-celled, multinucleated, or multicellular organisms, including yeasts, molds, and mushrooms. The organisms live as parasites, symbionts, or saprobes (see saprophyte).
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, and lichenslichen
, usually slow-growing organism of simple structure, composed of fungi (see Fungi) and photosynthetic green algae or cyanobacteria living together in a symbiotic relationship and resulting in a structure that resembles neither constituent.
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. The thallophytes were considered lower plantsplant,
any organism of the plant kingdom, as opposed to one of the animal kingdom or of the kingdoms Fungi, Protista, or Monera in the five-kingdom system of classification.
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 and were grouped together because of they consisted of one cell or a relatively undifferentiated mass of cells called a thallus, instead of having an organized plant body (stem, root, and leaf).



a lower plant (an alga, fungus, or lichen) whose body is not divided into stem and leaves but consists of a thallus. (A plant whose body is divided into stem and leaves is a cormophyte.) Some algae, for example, Caulerpa, Macrocystis, and Sargassum, are externally differentiated into stem and leaf organs, but the anatomic structure of these organs is less complex than in higher plants.

References in periodicals archive ?
At a plant population that is higher than generally recommended and used in Brazil (CARVALHO et al., 2010; SEVERINO et al., 2006a and b), the castor plants compensated for a lower plant population with a high number of racemes per plant and seeds per raceme in such a way that confined the seed and oil yields to a narrow range.
The cool-operating high-intensity fluorescents led to substantially lower plant cooling costs.
Generally, the lower plant densities resulted in longer AFIS mean fiber lengths in this environment.
This process will lower plant emissions, greatly reduce the amount of post-manufacturing carpet waste in landfills, and save Shaw's Dalton plant up to $2.5 million per year.
These data suggest a model in which basipetal auxin transport from a leaf either blocks movement of a growth-stimulatory signal (possibly cytokinin in nature) or initiates a movement of a growth inhibitory signal into the leaf from lower plant organs.
Construction began at the lower plant facilities and proceeded northerly to the upper plant location 44 miles away.
Global warming is predicted to cause rising ocean levels, lower plant productivity, and more frequent and dangerous weather patterns.
After 9 yr, plots that had received greater amounts of nitrogen had greater plant productivity and lower plant diversity (Tilman 1987; D.
Few people who have walked through crested wheatgrass stands can deny that they have far lower plant species diversity compared to native mid-grass prairie (Dormaar et al.
Lower plant costs and less pollutant emissions ca be realized.
The combination of diclosulam with bentazon or with two sequential glyphosate applications in E1 resulted in lower plant heights than the other combinations of diclosulam with post-emergence herbicides.
The lower plant spacing produces more yield per plot and enhance total yield because of more number of plants.