Crossword clues for algae
- Potential pond poisoner
- Seaweed, e.g.
- Biofuel source
- Tank top?
- Deterrent to swimming
- Phycologist's study
- Food for tadpoles
- Pond growth
- Organisms that cause red tide
- Simple pond life
- Primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves
- Sea mosses
- Pool owner's bane
- Water plants
- Bane of pool owners
- Tiny hydrophytes
- Kelp and Irish moss
- Swamp growths
- Water growths
- Plants containing chlorophyll
- Rootless plants
- Chief aquatic plant life
- Kelp and nostoc
- Cause of pool problems
- Aquatic plants
- Sea growth
- Marine plants
- Pond covering
- Pond film
- Fish food
- Sign of stagnation
- Lake life
- Pool owner's headache
- Basis of the marine food chain
- Pool problem
- Swimming pool problem
- Sea drifters?
- Frog spit
- Pond cover
- With fungi, they form lichens
- Tank buildup
- Certain thallophytes
- Plankton, in part
- Low end of the food chain
- Aquarium buildup
- Aquarium problem
- Pond growths
- Pond buildup
- It may fill up your tank
- Plankton components
- Tiny pond plants
- Red ___
- Fish tank buildup
- Aquatic plant life
- Pool owner's nuisance
Longman Dictionary of Contemporary English
The Collaborative International Dictionary
Alga \Al"ga\, n.; pl. Alg[ae] or algae. [L., seaweed.] (Bot.) A kind of seaweed; pl. the class of cellular cryptogamic plants which includes the black, red, and green seaweeds, as kelp, dulse, sea lettuce, also marine and fresh water conferv[ae], etc. The algae are primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves.
algae \algae\ n. plural of alga.
Douglas Harper's Etymology Dictionary
(plural), 1794, from alga (singular), 1550s, from Latin alga "seaweed," which is of uncertain origin, perhaps from a PIE root meaning "to putrefy, rot."
n. (en-irregular plural of: alga)
n. primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves [syn: alga]
Algae are a type of Protist.
Algae may also refer to:
- Algae fuel, a biofuel
- Algae (programming language)
- Algae eaters, species that feed on algae
- Snow algae, cold-tolerant species of algae
- Ice algae, algae that live in sea ice
- AlgaeBase, a database of algae
- Algae Lake, lake in Antarktis
Algae (; singular alga ) is an informal term for a large, diverse group of photosynthetic organisms which are not necessarily closely related and are thus polyphyletic. Included organisms range from unicellular genera, such as Chlorella and the diatoms, to multicellular forms, such as the giant kelp, a large brown alga which may grow up to 50 meters in length. Most are aquatic and autotrophic and lack many of the distinct cell and tissue types, such as stomata, xylem and phloem, which are found in land plants. The largest and most complex marine algae are called seaweeds, while the most complex freshwater forms are the Charophyta, a division of green algae which includes, for example, Spirogyra and the stoneworts.
There is no generally accepted definition of algae. One definition is that algae "have chlorophyll as their primary photosynthetic pigment and lack a sterile covering of cells around their reproductive cells". Some authors exclude all prokaryotes and thus do not consider cyanobacteria (blue-green algae) as algae.
Algae constitute a polyphyletic group since they do not include a common ancestor, and although their plastids seem to have a single origin, from cyanobacteria, they were acquired in different ways. Green algae are examples of algae that have primary chloroplasts derived from endosymbiotic cyanobacteria. Diatoms and brown algae are examples of algae with secondary chloroplasts derived from an endosymbiotic red alga.
Algae lack the various structures that characterize land plants, such as the phyllids (leaf-like structures) of bryophytes, rhizoids in nonvascular plants, and the roots, leaves, and other organs that are found in tracheophytes ( vascular plants). Most are phototrophic, although some are mixotrophic, deriving energy both from photosynthesis and uptake of organic carbon either by osmotrophy, myzotrophy, or phagotrophy. Some unicellular species of green algae, many golden algae, euglenids, dinoflagellates and other algae have become heterotrophs (also called colorless or apochlorotic algae), sometimes parasitic, relying entirely on external energy sources and have limited or no photosynthetic apparatus. Some other heterotrophic organisms, like the apicomplexans, are also derived from cells whose ancestors possessed plastids, but are not traditionally considered as algae. Algae have photosynthetic machinery ultimately derived from cyanobacteria that produce oxygen as a by-product of photosynthesis, unlike other photosynthetic bacteria such as purple and green sulfur bacteria. Fossilized filamentous algae from the Vindhya basin have been dated back to 1.6 to 1.7 billion years ago.
Usage examples of "algae".
The algae naturally and continuously desalinated sea water, which was why its core was salty while its outer surface was wet with fresh water: it was oozing the fresh water out.
Nothing distracted the meerkats from their little lives of pond staring and algae nibbling.
A sloth’s hairs shelter an algae that is brown during the dry season and green during the wet season, so the animal blends in with the surrounding moss and foliage and looks like a nest of white ants or of squirrels, or like nothing at all but part of a tree.
It was striking-looking in an ugly sort of way, with a rugged, yellowish brown shell about three feet long and spotted with patches of algae, and a dark green face with a sharp beak, no lips, two solid holes for nostrils, and black eyes that stared at me intently.
The smell of spent hand-flare shells, and prayers at dawn, and the killing of turtles, and the biology of algae, for example.
In the algae that covered the shells of some hawks-bills I sometimes found small crabs and barnacles.
It seemed to be a variety of marine algae, but quite rigid, far more so than normal algae.
In cross-section it consisted of two concentric walls: the wet, slightly rough outer wall, so vibrantly green, and an inner wall midway between the outer wall and the core of the algae.
The algae had a light sweetness that outdid in delight even the sap of our maple trees here in Canada.
The tree did indeed grow right out of the algae, as I had seen from the lifeboat.
Evidently the algae covered the shore thickly, for it was all I could find.
Finally, I resolved the problem by driving an oar, handle first, deep into the algae and tethering the boat to it.
I thought it was a cramp, that perhaps I had poisoned myself with the algae.
After a few seconds, they went back to doing what they had been doing before I appeared, which was either nibbling at the algae or staring into the ponds.
I did not ask myself why the algae did this, or how, or where the salt went.