Dictyotaceae
Dictyotaceae | ||||||||||||
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Common fork tongue ( Dictytoa dichotoma ) |
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Systematics | ||||||||||||
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Scientific name without rank | ||||||||||||
Dictyotales | ||||||||||||
Bory de Saint-Vincent | ||||||||||||
Scientific name of the family | ||||||||||||
Dictyotaceae | ||||||||||||
JV Lamouroux |
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
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Dictyota JV Lamouroux (Syn .: Dilophus J. Agardh, Glossophora J. Agardh, Glossophorella Nizamuddin et Campbell, Pachydictyon J. Agardh), with about 77 species, including:
- Common fork tongue ( Dictyota dichotoma )
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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
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Herringtonia Kraft, with the only kind
- Herringtonia aurata Kraft
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Homoeostrichus J. Agardh, with the only species
- Homoeostrichus sinclairii (JDHooker & Harvey) J.Agardh
- Lobophora J. Agardh (Syn .: Pocockiella Papenfuss), with 10 species
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Lobospira Areschoug, with the only kind
- Lobospira bicuspidata Areschoug
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Newhousia Kraft, GW Saunders, Abbott et Haroun, with the only species
- Newhousia imbricata Kraft, GWSaunders, IAAbbott & Haroun
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Padina Adanson (Syn .: Dictyerpa Collins et Harvey, Vaughaniella Børgesen), with about 51 species, including:
- Funnel algae ( Padina pavonica )
- Rugulopteryx De Clerck et Coppejans, with 4 species
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Scoresbyella Womersley, with the only species
- Scoresbyella profunda Womersley
- Spatoglossum Kützing, with about 20 species
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Stoechospermum Kützing, with the only species
- Stoechospermum polypodioides (JVLamouroux) J.Agardh
- Stypopodium Kützing, with 6 species
- Taonia J. Agardh, with 6 species
- Zonaria C. Agardh, with 13 species
- Family Dictyotaceae JV Lamouroux ex Dumortier (incl. Scoresbyellaceae Womersley)
swell
- ^ 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.
- ^ 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.
- ↑ 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.
- ^ Jean Baptiste Bory de Saint-Vincent: Botanique. Vol. 1. Cryptogamy. P. 142