Pseudocyphella

A feature found in certain lichens

Pseudocyphella is a morphological feature found in certain lichens, characterized by small, pore-like openings on the surface of the lichen thallus. These structures are important for gas exchange and are a key diagnostic feature in the identification of some lichen species.

Description

Pseudocyphellae are small, often circular or elongated openings that appear on the surface of the lichen thallus. They are typically white or pale in color and can vary in size and shape depending on the species. These structures are formed by the breakdown of the outer cortex of the lichen, exposing the medulla beneath.

Pseudocyphellae on the thallus of Pseudocyphellaria species.

The presence of pseudocyphellae is an important taxonomic feature used to distinguish between different genera and species of lichens. They are particularly common in the genera Pseudocyphellaria and Cetrelia.

Function

Pseudocyphellae serve a crucial role in the physiology of lichens. They facilitate gas exchange by allowing the diffusion of oxygen and carbon dioxide between the lichen and its environment. This is essential for the photosynthetic activity of the algal or cyanobacterial partner within the lichen symbiosis.

Distribution

Pseudocyphellae are found in a variety of lichen species across different habitats. They are most commonly observed in temperate and tropical regions, where they contribute to the ecological success of the lichens that possess them.

Pseudocyphellae on Cetrelia cetrarioides.

Ecological Importance

Lichens with pseudocyphellae play a significant role in their ecosystems. They contribute to soil formation, provide food and habitat for various organisms, and participate in nutrient cycling. The presence of pseudocyphellae can enhance the lichen's ability to colonize new substrates and survive in challenging environmental conditions.

Related pages

• Lichen
• Thallus
• Symbiosis
• Gas exchange