Riccia

Riccia

"This is an article about the plant Riccia; for the Italian city, see Riccia (Italy)".Taxobox
name = "Riccia"


image_caption = "Riccia fluitans"
regnum = Plantae
divisio = Marchantiophyta
classis = Marchantiopsida
ordo = Marchantiales
familia = Ricciaceae
genus = "Riccia"
genus_authority = L., 1753
subdivision_ranks = Species
subdivision =
* Riccia fluitans
* about 30 other species

"Riccia" is a genus of liverworts in the order Marchantiales. One of the more than 100 species in this genus is the "slender riccia" ("Riccia fluitans"), which can be found floating in ponds, and is sometimes used in aquariums.

The plant body is a thallus that is not differentiated into root, stem and leaf. The thallus is dorsoventrally differentiated, and is dichotomously branched to form a rosette. The upper (dorsal) surface of the thallus is green with a mid-dorsal sulcus (furrow or groove) and tiny air pores.

The lower (ventral) surface has a mid-ventral ridge bearing a single row of multicellular scales on either side of the ridge. The scales are multicellular and violet due to a pigment anthocyanin. There are numerous unicellular rhizoids of two types on the ventral surface. One type is called smooth and the other type is the pegged or tuberculated rhizoids; these help in anchorage and aborption. The inner surface of the smooth rhizoids is smooth while that of the tuberculate rhizoid will have internal cell wall projections.


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  • riccia — [ʀiksja] n. m. ou riccie [ʀiksi] n. f. ÉTYM. 1765, riccia (fém.); 1791, riccie; de Ricci, nom d un botaniste italien. ❖ ♦ Bot. Plante cryptogame, hépatique à thalle vert, sans stomates, dont les nombreuses espèces croissent en terre humide ou sur …   Encyclopédie Universelle

  • Riccĭa — (R. L.), Pflanzengattung aus der Famille der Ricciaceae, mit den Untergattungen Lichenoldes, Ricciella, Hemiseumata, Ricciocarpus, Salviniella u. Hemna; Arten sind Lebermoose, grüne, dem Thallus der Flechten ähnliche Ausbreitungen von… …   Pierer's Universal-Lexikon

  • Riccia — (spr. rittscha), Stadt in der ital. Provinz und dem Kreise Campobasso, mit Schloßruinen, Schwefelquelle, Dampfmühle, Fabrikation von Tonwaren, Öl und Teigwaren und (1901) 8187 Einw …   Meyers Großes Konversations-Lexikon

  • Riccĭa — L., Lebermoosgattung aus der Familie der Ricciazeen unter den Marchantiinen, umfaßt kleine, auf feuchtem Boden oder im Wasser lebende Moose mit gabelig geteiltem, oft durch Lufthöhlen blasig aufgetriebenem Laube, dem die Antheridien und… …   Meyers Großes Konversations-Lexikon

  • Riccia — (spr. rittscha), Stadt in der ital. Prov. Campobasso, (1901) 8187 E.; Schwefelquelle …   Kleines Konversations-Lexikon

  • Riccia — Pour les articles homonymes, voir Riccia (homonymie). Riccia Administration Pays …   Wikipédia en Français

  • Riccia — ▪ plant genus  genus of liverworts (small, creeping plants) in the order Marchantiales, widely distributed throughout the world. The most well known species, Riccia fluitans, sometimes called slender riccia, forms branching green ribbons about… …   Universalium

  • Riccia — Original name in latin Riccia Name in other language State code IT Continent/City Europe/Rome longitude 41.48193 latitude 14.83324 altitude 715 Population 5701 Date 2012 02 15 …   Cities with a population over 1000 database

  • Riccia — ID 71849 Symbol Key RICCI Common Name N/A Family Ricciaceae Category Liverwort Division Hepatophyta US Nativity N/A US/NA Plant Yes State Distribution N/A Growth Habit N/A …   USDA Plant Characteristics

  • riccia — ˈrichēə noun Usage: capitalized Etymology: New Latin, from P.F.Ricci 18th century Italian nobleman + New Latin ia : a genus (the type of the family Ricciaceae) of floating liverwort resembling duckweed and characterized by a dichotomously… …   Useful english dictionary

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