Dictyotaceae

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Dictyotaceae
Common fork tongue (Dictytoa dichotoma)

Common fork tongue ( Dictytoa dichotoma )

Systematics
without rank: Sar
without rank: Stramenopiles (stramenopiles)
without rank: Brown algae (Phaeophyceae)
without rank: Dictyotophycidae
without rank: Dictyotales
Family : Dictyotaceae
Scientific name without rank
Dictyotales
Bory de Saint-Vincent
Scientific name of the  family
Dictyotaceae
JV Lamouroux
Dictyopteris polypodioides
Padina arborescens
Funnel algae ( Padina pavonica )
Taonia atomaria

The Dictyotales are related to the brown algae , they are the only family to contain the Dictyotaceae .

description

The dictyotales have a tissue thallus . The growth takes place through a terminal apex cell . Cells are constantly being separated from this backwards, which further develop into an external, photosynthesis- operating assimilation tissue and an internal storage tissue. If the apex cell occasionally divides lengthways into two daughter cells, a dichotomous fork of the thallus arises . Marginal growth also occurs, for example with Padina . The cells contain several scattered disc-shaped plastids with no pyrenoid .

Development cycle

The Dictyotales show an isomorphic generation change , with the diploid sporophyte and the haploid gametophyte being similar . As reproductive organs, the sporophyte has single-chambered sporangia , in which four uncultivated spores are formed by meiosis . Once released, the spores germinate on the subsurface and grow into male and female gametophytes. The spermatogonia and oogonia, arranged in groups, arise on them in summer . At certain times - controlled by the position of the sun and moon - the immobile egg cells and the spermatozoids are released into the water. The sperm are pear-shaped and mobile by a flagellum with cilia , their second flagella is greatly reduced. After fertilization, a new sporophyte develops.

Systematics

The Dictyotaceae family was first described in 1822 by Jean Vincent Félix Lamouroux (in: Commentationes botanicae , pp. 72 and 101). This includes the Scoresbyellaceae Womersley family. The Dictyotales, then with the rank of an order , were first described in 1828 by Jean Baptiste Bory de Saint-Vincent . Both taxa are now considered synonymous .

According to Silberfeld et al. (2014) 20 genera with around 244 species (species numbers according to AlgaeBASE):

  • Dictyotales Bory de Saint-Vincent
    • Family Dictyotaceae JV Lamouroux ex Dumortier (incl. Scoresbyellaceae Womersley)
      • Canistrocarpus De Paula et De Clerck, with 3 species
      • Chlanidophora J. Agardh, with 2 species
      • Dictyopteris JV Lamouroux, with about 35 species
      • Dictyota JV Lamouroux (Syn .: Dilophus J. Agardh, Glossophora J. Agardh, Glossophorella Nizamuddin et Campbell, Pachydictyon J. Agardh), with about 77 species, including:
      • Dictyotopsis Troll, with the only species
        • Dictyotopsis propagulifera W. Troll. Some authors put it in a separate family Dictyotopsidaceae, but according to molecular biological studies it belongs to the Dictyotaceae.
      • Distromium Levring, with 6 species
      • Exallosorus JA Phillips, with 2 species
      • Herringtonia Kraft, with the only kind
      • Homoeostrichus J. Agardh, with the only species
      • Lobophora J. Agardh (Syn .: Pocockiella Papenfuss), with 10 species
      • Lobospira Areschoug, with the only kind
      • Newhousia Kraft, GW Saunders, Abbott et Haroun, with the only species
      • Padina Adanson (Syn .: Dictyerpa Collins et Harvey, Vaughaniella Børgesen), with about 51 species, including:
      • Rugulopteryx De Clerck et Coppejans, with 4 species
      • Scoresbyella Womersley, with the only species
      • Spatoglossum Kützing, with about 20 species
      • Stoechospermum Kützing, with the only species
      • Stypopodium Kützing, with 6 species
      • Taonia J. Agardh, with 6 species
      • Zonaria C. Agardh, with 13 species

swell

  1. ^ A b c Thomas Silberfeld, Florence Rousseau, Bruno de Reviers: An Updated Classification of Brown Algae (Ochrophyta, Phaeophyceae). In: Cryptogamie, Algologie. 35, No. 2, 2014, pp. 125–127.
  2. ^ A b Peter Sitte, Hubert Ziegler, Friedrich Ehrendorfer, Andreas Bresinsky: Strasburger, textbook of botany. Gustav Fischer, Stuttgart / Jena / New York 1991, ISBN 3-437-20447-5 , pp. 615-616.
  3. ↑ a b Michael D. Guiry in Michael D. Guiry, GM Guiry: Dictyotaceae . In: AlgaeBASE - World-wide electronic publication. National University of Ireland, Galway, accessed November 11, 2014.
  4. ^ Jean Baptiste Bory de Saint-Vincent: Botanique. Vol. 1. Cryptogamy. P. 142

Web links

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