red algae


red algae
marine algae of the phylum Rhodophyta, in which the chlorophyll is masked by a red or purplish pigment.
[1850-55]

* * *

      members of the division Rhodophyta (about 4,100 species), predominantly marine algae often found attached to other shore plants. Their morphological range includes filamentous, branched, feathered, and sheetlike thalli. In most species, thin protoplasmic connections provide continuity between cells. Their usual red or blue colour is the result of a masking of chlorophyll by phycobilin pigments (phycoerythrin and phycocyanin).

      The reproductive bodies of red algae are nonmotile. The female sex organ, called a carpogonium, consists of a uninucleate region that functions as the egg and a trichogyne, or projection, to which male gametes become attached. The nonmotile male gametes (spermatia) are produced singly in male sex organs, the spermatangia.

      Some red algae are important food plants (e.g., laver, dulse). They may retain both their colour and gelatinous nature when cooked. Industrially, Irish moss (Chondrus) is used as a gelatin substitute in puddings, toothpaste, ice cream, and preserves. Some species of Corallina and its allies are important, along with animal corals, in forming coral reefs and islands. agar, a gelatin-like substance prepared primarily from Gracilaria and Gelidium species, is important as a culture medium for bacteria and fungi.

* * *


Universalium. 2010.

Look at other dictionaries:

  • red algae — n. any of a division (Rhodophycota) of photosynthetic thallophytes, including reddish, brownish red, pink, or purple algae that form shrublike masses in the depths of the oceans …   English World dictionary

  • Red algae — Taxobox color = #taxobox color|Plantae name = Red algae image width = 240px domain = Eukaryota unranked phylum = Archaeplastida phylum = Rhodophyta phylum authority = Wettstein, 1922 subdivision ranks = Class subdivision = *Rhodophyceae(There… …   Wikipedia

  • red algae — raudondumbliai statusas T sritis ekologija ir aplinkotyra apibrėžtis Žemesniųjų augalų skyrius, kurį sudaro red algae4000 rūšių. Paplitę visose jūrose ir vandenynuose, rečiau gėluose vandenyse ir dirvožemyje. Vandenyje auga dažniausiai 20–40 m… …   Ekologijos terminų aiškinamasis žodynas

  • red algae — red′ al′gae n. pl. mcr marine algae of the phylum Rhodophyta in which the chlorophyll is masked by a red or purplish pigment • Etymology: 1850–55 …   From formal English to slang

  • red algae — noun marine algae in which the chlorophyll is masked by a red or purplish pigment; source of agar and carrageenan • Hypernyms: ↑alga, ↑algae • Hyponyms: ↑sea moss, ↑Irish moss, ↑carrageen, ↑carageen, ↑ …   Useful english dictionary

  • red algae — /rɛd ˈældʒi/ (say red aljee) noun algae of the class Rhodophyceae, in which the chlorophyll is masked by a red or purplish pigment …   Australian English dictionary

  • red algae — plural noun a large group of algae that includes many red seaweeds. [Division Rhodophyta.] …   English new terms dictionary

  • algae — algal, adj. /al jee/, n.pl., sing. alga / geuh/. any of numerous groups of chlorophyll containing, mainly aquatic eukaryotic organisms ranging from microscopic single celled forms to multicellular forms 100 ft. (30 m) or more long, distinguished… …   Universalium

  • Algae — For other uses, see Algae (disambiguation) and Alga (disambiguation). Algae Laurencia, a marine genus of Red Algae from Hawaii. Scientific classification …   Wikipedia

  • algae — A non taxonomic term used to group several phyla of the lower plants, including the Rhodophyta (red algae), Chlorophyta (green algae), Phaeophyta (brown algae), and Chrysophyta (diatoms). Many algae are unicellular or consist of simple… …   Dictionary of molecular biology


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.