Algae and Algae Species

There are thousands of algae species. In the classical classification of algae, the Chloromonadophyta, yellow-green algae, gold algae, diatoms and the brown algae are counted as classes to the group Heterokontophyta.

Green algae

Green algae types such as Chlorophyta, Chlamydomonas, Spirogyra, Cladophora, Hydrodictyon, Volvox, Spirogyra – spiral algae, Plantosphaeria, Sphaerocystis. The green algae also include the filamentous algae, which form green algae wadding. They often appear gelatinous.

Through the gas in the bubbles, the green algae drift to the surface and form a foamy carpet.

Blue-green algae

Blue algae (cyanobacteria) are not algae, strictly speaking, but bacteria, which at first glance have a similar appearance to algae and are commonly counted among them. With strong eutrophication, ie too high nutrient content, massive surface blooms or algal blooms form.

Blue algae in the lake form an oily film on the water surface.
Blue algae in the lake form an oily film on the water surface.

Brown algae

Brown algae (Phaeophyceae) look brownish and have a form of branched filaments in the garden pond. Brown algae are often found on plants and stones in fresh water

Brown algae like to accumulate on stones in shallow places from the pond.
Brown algae like to accumulate on stones in shallow places from the pond.

Brown algae in the saltwater look completely different, with large leaves and form up to 100m long threads, with which they root themselves in the soil. Brown algae in the sea can be found in cooler regions.

Diatoms

Diatoms (Bacillariophyta) are brown colored and called by a hard mineral shell, a cell envelope also Frustel. The brown alga consists mostly of silicon dioxide, as well as the brown alga. Silicon dioxide (SiO2) has the property of being very hard and is resistant to chemical agents.

Diatoms (250X) are a type of micro-algae. Over 100K different species exist. Foto: Kevin Dooley
Diatoms (250X) are a type of micro-algae. Over 100K different species exist. Foto: Kevin Dooley

More information about various types of algae:

Spirogyra algae cell under the microscope

These photos were taken with normal optical microscopy techniques under 400 magnification and show the effect of clicks on the algae cells:

The algae release creates acoustic clicks and emits click sounds under water. The hollow bodies, vacuole of the alga get into a squeeze through the high-precision clicks and tear. The cell juice comes out and the alga dies naturally.

Other species of algae under the microscope

Image source & friendly permission by NERC CEH

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