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Spot tests on the foliose lichen Punctelia borreri showing thallus (top) and medulla (bottom). The pinkish-red colour change of the medulla in the C and KC tests indicate the presence of gyrophoric acid, a chemical feature that helps to distinguish it from similar species in the same genus.
Edible lichens are lichens that have a cultural history of use as a food. Although almost all lichen are edible (with some notable poisonous exceptions like the wolf lichen , powdered sunshine lichen , and the ground lichen [ 1 ] ), not all have a cultural history of usage as an edible lichen.
Methods for species identification include reference to single-access keys on lichens. An example reference work is Lichens of North America (2001) by Irwin M. Brodo, Sylvia Sharnoff and Stephen Sharnoff and that book's 2016 expansion, Keys to Lichens of North America: Revised and Expanded by the same three authors joined by Susan Laurie ...
Arthonia radiata is a crustose lichen with an immersed thallus, often separated from its surroundings by a thin brown line.The thallus is typically pale, ranging from white to pale grey, sometimes with a brown or olive tinge, and often forms a mosaic-like pattern on its substrate.
Reichlingia americana contains notable quantities of 2'-O-methylperlatolic acid, which has been observed in several other genera of Arthoniomycetes, but R. americana distinguishes itself from other Arthoniomycetes due to its unique white, cracked, thallus with immersed apothecia and unique spore morphology (spores are submuriform with a terminal cell bigger than the others). [1]
A lichen's usefulness as a medicine is often related to the lichen secondary compounds that are abundant in most lichen thalli. Different lichens produce a wide variety of these compounds, most of which are unique to lichens and many of which are antibiotic. It has been estimated that 50% of all lichen species have antibiotic properties. [3]
Montanelia panniformis, commonly known as the shingle camouflage lichen, [2] is a species of saxicolous (rock-dwelling) foliose lichen in the family Parmeliaceae. [3] It has a mostly circumboreal distribution in Asia, Europe, and North America.
Brodoa oroarctica, commonly known as the Arctic sausage lichen, mountain sausage lichen, or rockgrub, is a species of rock-dwelling, foliose lichen in the family Parmeliaceae. [2] First described in 1974 by the Norwegian botanist Hildur Krog , it is characterised by its dark grey, irregularly spreading thallus with narrow cylindrical lobes that ...