This alga decomposes the hard coral limestone, making the surface of the rock soft and powdery.
But the longest of all known plants is the alga Macrocystis.
Each lichen consists of a plasmodomous plant (sometimes a protophyte, sometimes an alga) and a plasmophagous fungus.
Yet it is at least probable that the first real plant on this world was a seaweed or alga.
An alga (Halosphria viridis) has been brought up from depths of one thousand to two thousand metres.
The alga, Chromophyton rosanoffii, is another example of apparent luminosity, due to reflection from almost spherical cells.
When young this alga consists of an annulated tube formed of a single cell.
alga (seaweed) suggests algere, 'to be cold,' one of the symptoms of the ague (querceram).
It has recently been shown, however, that this organism is most probably an alga.
The alga Polysiphonia violacea floats in long feathery tufts from the stakes.
(plural), 1794, from alga (singular), 1550s, from Latin alga "seaweed," of uncertain origin, perhaps from a PIE root meaning "to putrefy, rot."
algae al·gae (āl'jē)
Any of various chiefly aquatic, eukaryotic, photosynthetic organisms, ranging in size from single-celled forms to the giant kelp.
Plural algae (āl'jē)
Any of various green, red, or brown organisms that grow mostly in water, ranging in size from single cells to large spreading seaweeds. Like plants, algae manufacture their own food through photosynthesis and release large amounts of oxygen into the atmosphere. They also fix large amounts of carbon, which would otherwise exist in the atmosphere as carbon dioxide. Algae form a major component of marine plankton and are often visible as pond scum and blooms in tidal pools. Land species mostly live in moist soil and on tree trunks or rocks. Some species live in extreme environments, such as deserts, hot springs, and glaciers. Although they were once classified as plants, the algae are now considered to be protists, with the exception of the cyanobacteria, formerly called blue-green algae. The algae do not form a distinct phylogenetic group, but the word alga serves as a convenient catch-all term for various photosynthetic protist phyla, including the green algae, brown algae, and red algae.
Primitive organisms that contain chlorophyll but do not have structures, such as xylem and phloem, to transport fluids. Algae sometimes contain only a single cell, and nowadays they are not considered members of the plant kingdom.
Note: The most familiar algae are the greenish scum that collects in still water.
Note: Algae supply a considerable part of the world's oxygen.