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The IAL has established various committees to address specific aspects of lichenology. The Lichen Terminology Committee, for instance, was responsible for developing an IAL-approved definition of a lichen: "A lichen is an association of a fungus and a photosynthetic symbiont resulting in a stable thallus of specific structure". [3]
Varian Medical Systems is an American radiation oncology treatments and software maker based in Palo Alto, California.Their medical devices include linear accelerators (LINACs) and software for treating cancer and other medical conditions with radiotherapy, radiosurgery, proton therapy, and brachytherapy.
After evaporating the acetone, the lichen substances are left on the paper in a ring around the lichen fragment. The filter paper can then be spot tested in the usual way. [ 22 ] In cases where the results of a spot test on the thallus are uncertain, it is possible to squash a thin section of the tissue on a microscope slide in a minimal amount ...
This is possible due to the action of lichen phenolics such as usnic acid derivatives. [34] From the 1950s the lichen product usnic acid was the object of most antitumour research. These studies revealed some in vitro antitumour activity by substances identified in two common lichens Peltigera leucophlebia and Collema flaccidum. [35]
Lichen sclerosus (LS) is a chronic, inflammatory skin disease, of unknown cause, which can affect any body part of any person, but has a strong preference for the genitals (penis, vulva), and is also known as balanitis xerotica obliterans when it affects the penis. Lichen sclerosus is not contagious.
Caloplaca is a genus of crustose lichens characterised by their grey to white thallus (main body) and distinctive yellow to orange fruiting bodies ().Unlike some related genera, the thallus lacks anthraquinone pigments but contains Sedifolia-grey pigment, which turns violet when tested with potassium hydroxide solution (the K spot test).
Chaenotheca is a genus of lichenized fungi within the family Coniocybaceae. [1] The sexual reproduction structures are a mass of loose ascospores that are enclosed by a cup shaped exciple sitting on top of a tiny stalk, having the appearance of a dressmaker's pin (called a mazaedium), hence the common name pin lichen.
Xanthoria aureola, commonly known as the seaside sunburst lichen, is a lichenized species of fungus in the family Teloschistaceae and phylum Ascomycota. [1] X. aureola can be recognized by its bright yellow-orange pigmentation and abundant strap-shaped lobes. [2] It is usually found growing on exposed, nutrient-rich rocks in sunny, maritime ...