Considering the body of algae, we can assume that its structure is leafy. This is actually not the case. It is a tall. This is a special structure. It is characteristic of lower plants, fungi and lichens.
Tallom is ...
Tall is also called the thallus, or slane. What is its difference from escape? The thing is that thallus is a structure formed by non-specialized cells. They are connected only anatomically, but each functions as a separate entity. In this case, tissues do not form, which means organs. The thalli have no root. Its functions are performed by rhizoids, which attach the body to the substrate.
Laminar organisms
In multicellular algae, thallus is a structure that can be filamentous, bulky, lamellar or leaf-shaped. They grow exclusively in water, so they do not need mechanical or conductive tissues. Their color depends on the type of pigment that prevails in the cells. However, regardless of this trait, they all contain chlorophyll and are capable of photosynthesis. Most unicellular algae have a monad type thallus. It is characterized by a constant shape and mobility with the help of flagella. Lower plants with amoeboid thallus are less common. Thanks to the thin shell, they can change their shape and move around, forming pseudopodia. The thalli of the monad and amoeboid type can either be unicellular or unite in colonies.
The body of the fungi is also formed by the thallus. It consists of individual threads - hyphae, the totality of which is called mycelium or mycelium. These organisms feed heterotrophically, absorbing hyphae with dissolved nutrients. Yeast mushrooms have a special type of thallus. They consist of individual cells or chains formed by them, capable of budding.
Tall lichen
Lichens are a collection of fungal filaments and cells of blue-green algae or cyanobacteria. Their types of thallus can be leafy, bushy or scale. The former externally resemble dissected plates, the lower part of which forms the cortical layer and outgrowths. They are attached to the substrate.
Bushy thalli grow vertically. They are attached to the substrate by the lower part of the thallus. Outwardly look like small bushes. Scale lichens have the appearance of a crust or plaque of different colors. They coalesce so tightly with the substrate that it is almost impossible to separate them. Tallomas are also characteristic of higher spore plants. They have the appearance of a seedling - a thin green plate.
Physiology features
Tall, despite the rather primitive features of the structure, provides all the necessary processes of life. With its help, vegetative propagation and spore formation occurs. Thallus cells are chlorophyll-bearing. They are able to absorb finished organic matter from the substrate. Amoeboid and flagellate types of thalli are capable of movement.
The thalli of some organisms may enter into mutually beneficial cohabitation with representatives of other kingdoms of wildlife. For example, fungal hyphae form mycorrhiza with the roots of higher plants. Lichen thallus constituents also benefit from coexistence. The fungus absorbs monosaccharides, which are synthesized by an algae cell. The latter are provided with minerals using hyphae.
So, thallus is a collection of cells that form the body of lower and higher spore plants, fungi and lichens. This structure does not form tissues and consists of non-specialized structures anatomically connected.