Geitlerinema
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| ( Anagnostidis and Komárek ) Anagnostidis 1998 |
Geitlerinema is a genus of blue-green algae (Cyanophyceae).
features
The filamentous cells of Geitlerinema form cell chains ( trichomes ). These are thinner than 5 - 6 μm. The individual cells are longer than wide or isodiametric and never disc or coin shaped. Constrictions between the cells are generally absent or very weak. The apical cells at the top of the trichomes are rounded, conical or clearly pointed and often curved. Polar gas vesicles are rare. Some species form large granules from the storage substance cyanophycin .
The freshly isolated cultures show active, gliding movement through rotation of the trichomes. This can serve as a distinguishing feature for the very similar genus Leptolyngbya .
Reproduction occurs through the formation of so-called hormogonia , individual sections of the cell thread that peel off and grow again.
Systematics
The genus Geitlerinema belongs to the family Coleofasciculaceae within the order Oscillatoriales . The type species is Geitlerinema splendidum . First, the genus was listed as a subgenus of Phormidium . The establishment as a separate genus took place in 1989. The genus name honors the Austrian botanist Lothar Geitler . In 2017, some species from this genus were placed in the newly established genus Anagnostidinema . The name Anagnostidinema was chosen in honor of the botanist Constantinos Anagnostidis , who established the genus Geitlerinema . The following is a list of the species (as of August 2020):
- Geitlerinema acutissimum (Kufferath 1914) Anagnostidis 1989
- Geitlerinema amphibium (Agardh ex Gomont 1892) Anagnostidis 1989
- Geitlerinema carotinosum (Geitler 1956) Anagnostidis 1989
- Geitlerinema pseudacutissimum (Geitler 1956) Anagnostidis 1989
- Geitlerinema splendidum (Greville ex Gomont 1892) Anagnostidis 1989
- Geitlerinema unigranulatum (Singh 1939) Komárek and Azevedo 2000
ecology
The species of Geitlerinema were found in ecologically diverse habitats. They form mats on surfaces that are under water, such as rocks, plants or wood. They are also found in the soil. The sites include, for example, fresh and sea water with a high salt content ( hypersaline ), hot springs with temperatures above 55 ° C, or in moist soil in greenhouses. Other finds also come from brackish water , moors and other ecosystems.
The species Geitlerinema amphibium has been found in thermal springs , brackish water, stagnant water and greenhouses. The species G. carotinosum comes from the bank region ( littoral area ) of the Lunzer Obersee in Austria.
The species Geitlerinema carotinosum and G. pseudacutissimum seem to have only a limited distribution. Geitlerinema amphibium and G. splendidum , however, are cosmopolitan .
Individual evidence
- ↑ a b George M. Garrity (Ed.): The Archaea and the deeply branching and phototrophic Bacteria. Springer, New York 2001, ISBN 0-387-98771-1
- ↑ a b c Konstantinos Anagnostidis: Geitlerinema, a new genus of oscillatorialean cyanophytes In: Plant Systematics and Evolution. (1989) 164, pp. 33-46 doi : 10.1007 / BF00940428
- ↑ a b Petr Dvořák, Dale A. Casamatta, Petr Hašler, Eva Jahodářová, Alyson R. Norwich and Aloisie Poulíčková: Diversity of the Cyanobacteria In: Modern Topics in the Phototrophic Prokaryotes . ISBN 978-3319462615
- ^ Jean Euzéby, Aidan C. Parte: Genus Geitlerinema. In: List of Prokaryotic names with Standing in Nomenclature (LPSN). Retrieved February 21, 2020 .
literature
George M. Garrity (Ed.): The Archaea and the deeply branching and phototrophic Bacteria. Springer, New York 2001, ISBN 0-387-98771-1