Botrydium

Botrydium
Botrydium granulatum
Systematics
without rank: Sar without rank: Stramenopiles (stramenopiles) without rank: Yellow-green algae (Xanthophyceae) Order : Botrydiales Family : Botrydiaceae Genre : Botrydium
Scientific name
Botrydium
Wallr .

Botrydium is a genus of algae from the family of Botrydiaceae within the yellow-green algae (Xanthophyceae).

distribution

Botrydium species live in the floodplain of standing and flowing water , as well as in moist fields and similar locations. They are typical bottom-dwelling algae.

description

Botrydium forms a relatively large, multinucleated siphonoblast ; when the nucleus divides , no cell or protoplast division takes place, and no dividing cell walls are formed. The siphonoblast is surrounded by a common cell wall. These are 1 to 3 mm large, green bubbles that are anchored in the ground with a rhizoid system and stand together in groups. There is a large vacuole inside . They have a cytoplasmic wall layer with many plastids and numerous cell nuclei . The surface of the bubbles is often covered with lime scale. Reserve carbohydrates are stored in the cytoplasm.

Reproduction

In the event of flooding, the vegetative reproduction takes place as the plasmatic wall covering transforms into flagellated spores ( zoospores ) with two flagella of different lengths. When it is dry, it is transformed into uncultivated spores ( aplanospores ). The existence of sexual reproduction is controversial.

species

The genus Botrydium currently comprises 13 species. (As of February 2018)

• Botrydium becherianum Vischer
• Botrydium corniforme Vodenicharov
• Botrydium corniforme Vodenicharov
• Botrydium cystosum Vischer
• Botrydium divisum M.OPIyengar
• Botrydium granulatum (L.) Greville
• Botrydium intermedium M.OPIyengar ex ARRao
• Botrydium milleri Vodenicharov
• Botrydium milleri Vodenicharov
• Botrydium pachydermum V.V. Miller
• Botrydium stoloniferum A.K. Mitra
• Botrydium tuberosum M.OPIyengar
• Botrydium wallrothii Kützing

swell

• Karl-Heinz Linne von Berg, Michael Melkonian u. a .: The Kosmos algae guide. The most important freshwater algae under the microscope. Kosmos, Stuttgart 2004, ISBN 3-440-09719-6 .
• Heinz Streble , Dieter Krauter : Life in a drop of water. Microflora and microfauna of freshwater. An identification book. 10th edition. Kosmos, Stuttgart 2006, ISBN 3-440-10807-4 .

Individual evidence

1. ↑ Hanuš Ettl, Georg Gärtner: Syllabus of the soil, air and lichen algae . Springer, 2013, ISBN 3-642-39461-2 .
2. ^ Botrydium - In: Guiry, MD; Guiry, GM: AlgaeBase. National University of Ireland, Galway, last accessed February 12, 2018.

Web links

Commons : Botrydium  - collection of images, videos and audio files