Rhizines

Definition

Rhizines are root-like structures found in lichens that anchor the thallus (body) to the substrate. They do not absorb water or nutrients but provide stability.

5 Must Know Facts For Your Next Test

1. Rhizines are specific to foliose and fruticose lichens, not crustose lichens.
2. They vary in number and complexity, from simple to complex branching patterns.
3. Rhizines are composed of fungal hyphae, which are filamentous structures.
4. The presence and type of rhizines can be used as a characteristic for lichen identification.
5. Rhizines help protect lichens from environmental stresses by firmly attaching them to substrates like rocks, soil, or tree bark.

Review Questions

• What function do rhizines serve in lichens?
• Which types of lichens typically possess rhizines?
• How can rhizines aid in the identification of lichen species?

Related terms

Thallus: The main body of a lichen composed of fungal and algal or cyanobacterial partners.

Hyphae: Thread-like structures that make up the mycelium of a fungus.

Substrate: The surface or material on which an organism lives, grows, or obtains its nourishment.