Biatora vernalis is a species of crustose lichen belonging to the family Ramalinaceae. It is characterized by its inconspicuous thallus and distinctive dark apothecia, commonly found in a variety of moist, shaded environments.
Description
The thallus of Biatora vernalis is crustose, meaning it forms a thin, often closely adhering layer over its substrate. It is typically pale greyish-green to yellowish-grey, sometimes whitish, and can be partly immersed within the substrate, making it somewhat inconspicuous. The surface is usually smooth to minutely granular or scurfy.The reproductive structures, known as apothecia, are a key identifying feature. They are typically lecideine, meaning they have a proper margin that is the same color and tissue as the disk, not resembling the thallus. The apothecia are often abundant, scattered, and relatively small, usually 0.3-1.0 mm in diameter. Their color ranges from dark brown to black, and they often become strongly convex to subglobose with age, sometimes obscuring the proper margin. The asci (spore-bearing sacs) contain eight simple, hyaline (clear) ascospores, which are typically ellipsoid.
Habitat and Distribution
Biatora vernalis is a widespread species, commonly found in temperate regions across the Northern Hemisphere, including Europe, North America, and parts of Asia. It is quite versatile in its choice of substrate, often growing on the bark of deciduous trees (especially older, mossy trunks), decaying wood, mossy rocks, or directly on acidic soil. It prefers damp, shaded microhabitats, such as old-growth forests, ravines, and stream banks, where humidity levels are consistently high. Its presence often indicates a relatively undisturbed and stable environment.Classification
- Kingdom: Fungi
- Phylum: Ascomycota
- Class: Lecanoromycetes
- Order: Lecanorales
- Family: Ramalinaceae
- Genus: Biatora
- Species: Biatora vernalis