Nigricans Lange
Nigricans, a Latin word meaning ''black'', may refer to : * Acanthosis nigricans, a brown to black, poorly defined, velvety hyperpigmentation of the skin * '' Ulmus americana 'Nigricans''', an American elm cultivar * '' Ulmus glabra 'Latifolia Nigricans''', a wych elm cultivar * a cultivar of ''Pittosporum tenuifolium ''Pittosporum tenuifolium'' is a small evergreen tree endemic to New Zealand – up to – commonly known as and black matipo, and by other Māori names and . Its small, very dark, reddish-purple flowers generally go unnoticed, and are scented ...

Black
Black is a color which results from the absence or complete absorption of visible light. It is an achromatic color, without hue, like white and grey. It is often used symbolically or figuratively to represent darkness. Black and white have often been used to describe opposites such as good and evil, the Dark Ages versus Age of Enlightenment, and night versus day. Since the Middle Ages, black has been the symbolic color of solemnity and authority, and for this reason it is still commonly worn by judges and magistrates. Black was one of the first colors used by artists in Neolithic cave paintings. It was used in ancient Egypt and Greece as the color of the underworld. In the Roman Empire, it became the color of mourning, and over the centuries it was frequently associated with death, evil, witches, and magic. In the 14th century, it was worn by royalty, clergy, judges, and government officials in much of Europe. It became the color worn by English romantic poets, businessmen ...
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Acanthosis Nigricans
Acanthosis nigricans is a medical sign characterised by brown-to-black, poorly defined, velvety hyperpigmentation of the skin. It is usually found in body folds, such as the posterior and lateral folds of the neck, the armpits, groin, navel, forehead and other areas. It is associated with endocrine dysfunction, especially insulin resistance and hyperinsulinaemia, as seen in diabetes mellitus. This activates the insulin-like growth factor receptors, which leads to proliferation of keratinocytes, fibroblasts and other cells in the skin. Activation of other growth factor receptors such as fibroblast growth factor receptors or epidermal growth factor receptor can also be responsible. Signs and symptoms Acanthosis nigricans may present with thickened, velvety, relatively darker areas of skin on the neck, armpit and in skin folds. Causes It typically occurs in individuals younger than age 40, is associated with insulin resistance, Type 2 diabetes, obesity or endocrinopathies, s ...
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Ulmus Americana 'Nigricans'
The American Elm cultivar ''Ulmus americana'' 'Nigricans' Dieck was cloned from a selection made from seedlings raised by the Zöschener Baumschule, Zöschen, Germany, and listed by Georg Dieck Georg Dieck (28 April 1847 in Zöschen – 21 October 1925 in Zöschen) was a German entomologist and botanist. After attending high school in Naumburg, he studied natural sciences at Jena, where he was a pupil and assistant of Ernst Haeckel. In 1 ... with a brief description in ''Haupt-catalog der Obst- und gehölzbaumschulen des ritterguts Zöschen bei Merseburg'', 1885. An 'American Black Elm', "a variety of ''Ulmus americana'' of more erect habit", was marketed by Trumbull and Beebe's nursery, San Francisco, in the 1890s, along with a batch of other European elm cultivars. Description The tree was distinguished by its very dark green foliage. Occasionally listed as 'Nigrescens', it has caused confusion with a ''U. minor'' cultivar of that name. Cultivation No specimens are known ...
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Ulmus Glabra 'Latifolia Nigricans'
The putative Wych Elm cultivar ''Ulmus glabra'' 'Latifolia Nigricans' was first described, as ''Ulmus campestris latifolia nigricans'', by Pynaert in 1879. Pynaert, however, did not specify what species he meant by ''U. campestris''. The tree was supplied by the Späth nursery of Berlin in the late 19th century and early 20th as ''Ulmus montana latifolia nigricans''. Späth, like many of his contemporaries, used ''U. montana'' both for Wych Elm cultivars and for those of the ''U.'' × ''hollandica'' group. Description Pynaert described the tree as "very vigorous, the leaves being large and of a dark tint". Cultivation No specimens are known to survive. One tree, probably supplied by the Späth nursery of Berlin, was planted as ''Ulmus montana latifolia nigricans'' in 1896 at the Dominion Arboretum, Ottawa, Canada. Three specimens supplied by Späth to the Royal Botanic Garden Edinburgh in 1902 as ''Ulmus montana latifolia nigricans'' may survive in Edinburgh as it was the pra ...
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