Overview
Buellia thomae (Tuck.) Imshaug is a species of lichenized ascomycetes that belongs to the family Caliciaceae. It grows on the bark of trees and rocks surfaces and is widely distributed in North America.
Common names
Buellia thomae is commonly known as Thom's disk lichen.
Appearance
The thallus of Buellia thomae has a blackish-grayish color, and it is usually thin and crustose. This lichen is characterized by its small (0.2-0.3 mm diam.), plane disks that are sometimes immersed in the thallus. The ascoma and the thallus contain filaments that are intricately interwoven and form a dense network.
Uses
Buellia thomae is primarily used as an indicator of air quality because it is sensitive to sulfur dioxide air pollution. It has been used in biomonitoring studies to assess the impacts of industrial emissions on the environment.
Light requirements
Buellia thomae (Tuck.) Imshaug requires moderate light levels for optimal growth. It does not thrive in direct sunlight, but it needs enough light to photosynthesize and grow. The plant can grow in shaded areas with diffuse light or in areas that receive morning sun.
Temperature requirements
The ideal temperature range for Buellia thomae (Tuck.) Imshaug growth is between 15°C and 25°C. The plant can tolerate low temperatures but cannot withstand freezing temperatures. In high-temperature regions, the plant grows best in shaded areas, where temperatures are lower.
Soil requirements
The plant Buellia thomae (Tuck.) Imshaug prefers well-drained soils that are neutral to slightly acidic. It grows well in loam, sandy loam, and clay soils. The soil must have good water retention properties and good aeration for proper root growth. The plant can also grow in rocky soils and can attach itself to rocks with its rhizoids.
Cultivation Methods
Buellia thomae is a lichen that can be found growing on rocks, bark, and soil. There is no specific cultivation method required for this plant as it grows in the wild without any interference. However, if you intend to grow it in your garden, make sure to mimic its natural habitat as much as possible. Grow it on rocks or bark in a well-draining soil mix with a pH range of 6 to 7.5.
Watering Needs
Buellia thomae does not require frequent watering as it can survive long periods of drought. Water it only when the soil is dry to the touch. Avoid over-watering as it can lead to root rot and fungal diseases.
Fertilization
As a lichen, Buellia thomae does not require any fertilization. It obtains its nutrients from the air, water, and substrate it grows on. Do not apply any fertilizers as they can harm the plant.
Pruning
There is no need to prune Buellia thomae as it grows in a low and spreading manner. However, you can remove any dead or damaged parts to prevent the spread of diseases. Use clean and sharp tools to avoid injuring the plant.
Propagation of Buellia thomae (Tuck.) Imshaug
Buellia thomae (Tuck.) Imshaug propagates through the dissemination of its spores. The spores are produced in structures called apothecia, which are found on the upper surface of the thallus.
Once the spores are mature, they are released into the air and can be dispersed by the wind. If the spores land on a suitable substrate, they can germinate and grow into a new thallus.
Propagation of Buellia thomae (Tuck.) Imshaug can also be achieved through the vegetative propagation method. This can be done by taking a small piece of the thallus and placing it onto a substrate. The thallus will then begin to grow and develop into a new plant.
Another method of vegetative propagation is through the use of isidia, which are small projections found on the upper surface of the thallus. These isidia can break off and form new plants, thus increasing the population of Buellia thomae (Tuck.) Imshaug in a given area.
Disease Management for Buellia thomae (Tuck.) Imshaug
Buellia thomae (Tuck.) Imshaug is a resilient plant that can withstand various environmental conditions. However, diseases can affect this plant. The common diseases that B. thomae is susceptible to include foliar diseases and root rot. To control the spread of diseases, it is recommended to regularly inspect the plants and remove any infected area. Cultural practices such as ensuring proper drainage, reducing humidity and overcrowding can also help prevent the development of diseases. Applying fungicides can be an effective way to manage fungal diseases.
Pest Management for Buellia thomae (Tuck.) Imshaug
Common pests that may affect B. thomae include spider mites, aphids, and slugs. These pests can cause physical damage to the plant and reduce its productivity. One way of controlling pests is to regularly monitor for their activity. Natural predators such as ladybugs can be introduced to control insect pests. Additionally, controlling moisture levels and avoiding over-fertilization can help deter pest infestations. If the infestation is severe, insecticides can be used. It is important to ensure the insecticide used is recommended for use on the type of pest and the plant.
