Question

What is hetrotrichous thallus?

Answer 1

Heterotrichous thallus:

1. It is a type of thallus that has a prostrate section and a projecting or erect system.
2. Examples- Green algae, such as Draparnaldia and Fritschiella, and brown algae, such as Ectocarpus, have heterotrichous thallus.

Thallus of Ectocarpus:

The body of the plant is heterotrichous and is divided into a prostrate system and an erect system. They are as follows:

Prostate or creeping system:

1. The prostrate system is made up of creeping filaments that are irregularly branched.
2. With the help of rhizoids, these filaments are linked to the substratum.
3. In epiphytic conditions, this system penetrates the host tissues.
4. In free-floating animals, the prostrate system is underdeveloped.

Erect system:

1. The projection system arises from the prostate system.
2. It is composed of well-branched filaments. Each branch is below the septum.
3. The main axis and branch of the projection system are a single line. In this case, the Rens are connected end-to-end in a row.
4. The branches end at the pointed tip and form the hair.
5. In some species, the old part of the main axis is covered (cortex).
6. This pod consists of a layer of downward rhizome branches.