Name the types of mycelium found in Agaricus.

Explanation

The thallus is made up of branched structures called hyphae. A large number of hyphae constitute the mycelium.
Types of mycelium:
1. Primary mycelium: The primary mycelium develops from the germination of basidiospore. It is septate, uninucleate and haploid. It is also called monokaryotic mycelium.
2. Secondary mycelium: Fusion of two primary mycelium of opposite strains give rise to secondary mycelium or dikaryotic mycelium. The dikaryotic mycelium develops into hyphal cords called Rhizomorphs. and perennates the soil for a long period.
3. Tertiary mycelium: The tertiary mycelium is found in the fruit body called basidiocarp. Each cell of the hyphae posssess a cell wall made up of chitin and cell organelles like mitochondria, golgibodies, Endoplasmic reticulum etc., are also present.