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algae    音标拼音: ['ældʒi]
n. 藻类,海藻

藻类,海藻

algae
n 1: primitive chlorophyll-containing mainly aquatic eukaryotic
organisms lacking true stems and roots and leaves [synonym:
{alga}, {algae}]

algae \algae\ n.
plural of {alga}.
[WordNet 1.5]


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.
[1913 Webster WordNet 1.5]


Cryptogamia \Cryp`to*ga"mi*a\ (kr?p`t?-g?"m?-?), n.; pl.
{Cryptogami[ae]} (-?). [NL., fr. Gr. krypto`s hidden, secret
ga`mos marriage.] (Bot.)
The series or division of flowerless plants, or those never
having true stamens and pistils, but propagated by spores of
various kinds.
[1913 Webster]

Note: The subdivisions have been variously arranged. The
following arrangement recognizes four classes: -- I.
{{Pteridophyta}, or {Vascular Acrogens}.} These include
Ferns, {Equiseta} or Scouring rushes, {Lycopodiace[ae]}
or Club mosses, {Selaginelle[ae]}, and several other
smaller orders. Here belonged also the extinct coal
plants called {Lepidodendron}, {Sigillaria}, and
{Calamites}. II. {{Bryophita}, or {Cellular Acrogens}}.
These include {Musci}, or Mosses, {Hepatic[ae]}, or
Scale mosses and Liverworts, and possibly
{Charace[ae]}, the Stoneworts. III. {{Alg[ae]}}, which
are divided into {Floride[ae]}, the Red Seaweeds, and
the orders {Dictyote[ae]}, {Oospore[ae]},
{Zoospore[ae]}, {Conjugat[ae]}, {Diatomace[ae]}, and
{Cryptophyce[ae]}. IV. {{Fungi}}. The molds, mildews,
mushrooms, puffballs, etc., which are variously grouped
into several subclasses and many orders. The {Lichenes}
or Lichens are now considered to be of a mixed nature,
each plant partly a Fungus and partly an Alga.
[1913 Webster] Cryptogamic
Cryptogamian


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  • Algae - Encyclopedia. com
    Algae Algae (singular: alga) are photosynthetic, eukaryotic organisms that do not develop multicellular sex organs Algae can be unicellular, or they may be large, multicellular organisms Algae can occur in salt or fresh waters, or on the surfaces of moist soil or rocks The multicellular algae develop specialized tissues, but they lack the true stems, leaves, or roots of the more complex
  • Green Algae | Encyclopedia. com
    green algae Large group of marine and freshwater algae (phylum Chlorophyta) They are distinct from other algae by virtue of possessing cup-shaped chloroplasts that contain chlorophyll b, and by producing cells with flagella at some stage in their lives Green algae range in size from microscopic single-cell types to large, complex seaweeds
  • Cyanobacteria - Encyclopedia. com
    Cyanobacteria Cyanobacteria (blue-green algae [1]) are microorganisms that structurally resemble bacteria (they lack a nucleus and organelles ) However, unlike other bacteria, cyanobacteria contain chlorophyll a and conduct oxygenic photosynthesis
  • Chlorophyta - Encyclopedia. com
    Chlorophyta (green algae) Division of algae which are typically green in colour In common with higher land plants, green algae include chlorophylls a and b among their principal pigments, have cellulose as the main constituent of cell walls, and form food reserves of starch
  • Protista - Encyclopedia. com
    Protista Background Classification Protozoa Algae Slime molds and water molds Disease-causing protists Beneficial protists Resources The kingdom Protista is the most diverse of all of the eukaryotic kingdoms It is certainly not monophyletic and its members really only share the fact that they have a simple structure, without any obvious tissues or organs There are more than 200,000 known
  • Evolution of Plants - Encyclopedia. com
    Evolution of Plants Plants, descended from aquatic green algal ancestors, first appeared on land more than 450 million years ago during or prior to the Ordovician period This event preceded the colonization of land by four-footed animals (tetrapods), which occurred considerably later in the Devonian period (408 to 360 million years ago) Understanding the origin of plants is important because
  • Rhodophyta - Encyclopedia. com
    Rhodophyta (red algae) A group of Eukarya which are mostly red in colour; no flagellated cells are formed, and the storage product is a type of starch known as floridean starch Sexual reproduction tends to be complicated Red algae may be unicellular, but most are filamentous or membranaceous The majority occur in the sea, but some are freshwater or terrestrial The group includes 1 class
  • Trophic Levels - Encyclopedia. com
    Trophic levels Trophic levels describe the various stages within ecological food chains or webs Examples of trophic levels, all of which will be described below, are primary producers, primary consumers or herbivores, and secondary and higher-level consumers, or predators Food webs are based on the productivity of photosynthetic organisms, such as blue-green bacteria , algae , and plants
  • Euglenophyta - Encyclopedia. com
    Euglenophyta A division of typically unicellular protists, sometimes regarded as algae, sometimes as protozoa (class Phytomastigophora) They are characterized by the possession of a single flagellum, the formation of paramylum as a storage product, possession of chlorophylls a and b, and the absence of sexual reproduction Vegetative cells lack a cell wall but possess a proteinaceous pellicle





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