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Usnea is a genus of fruticose lichens in the large family Parmeliaceae. The genus, which currently contains roughly 130 species, was established by Michel Adanson in 1763. Species in the genus grow like leafless mini- shrubs or tassels anchored on bark or twigs.
Usnea subcomplecta is believed to be endemic to the Galápagos Islands, where it is a common species. It thrives in the humid and upper transition zones , as well as in some high-altitude dry zones. The lichen is usually found in open, often disturbed habitats such as farmland areas, fence posts, and trees along pastures.
Schimmelpenning syndrome is a neurocutaneous condition characterized by one or more sebaceous nevi, usually appearing on the face or scalp, [1] associated with anomalies of the central nervous system, ocular system, skeletal system, cardiovascular system and genitourinary system.
The Parmeliaceae is a large and diverse family of Lecanoromycetes.With over 2700 species [2] in 71 genera, it is the largest family of lichen-forming fungi.The most speciose genera in the family are the well-known groups: Xanthoparmelia (822 species), Usnea (355 species), Parmotrema (255 species), and Hypotrachyna (262 species).
Usnea pallidocarpa is characterised by its shrubby, erect appearance and a thallus (the body of the lichen) that typically measures between 5 and 7 cm in length. This lichen originates from a holdfast , which is the anchoring part of the lichen, appearing either unpigmented or with a brownish hue.
This is a shortened version of the twelfth chapter of the ICD-9: Diseases of the Skin and Subcutaneous Tissue. It covers ICD codes 680 to 709. The full chapter can be found on pages 379 to 393 of Volume 1, which contains all (sub)categories of the ICD-9. Volume 2 is an alphabetical index of Volume 1.
Various differential diagnoses of pigmented skin lesions, including dysplastic nevus, showing the relative incidence of biopsied lesions, and malignancy potential. When an atypical mole has been identified, a skin biopsy takes place in order to best diagnose it. Local anesthetic is used to numb the area, then the mole is biopsied.
Cutaneous myxoma appears as a little, slowly expanding dermal or subcutaneous lump that typically affects adults' heads and necks. [3] Alopecic lesions have been reported, [4] [5] characterized by hair tufts overlaying the lesion or even hypertrichosis. [6]