The bark is grey and covered with lenticels, becoming thick and deeply fissured on old trees. The bark can become hard enough to cause sparks when cut with a chainsaw.Ewing, Susan. The Great Alaska Nature Factbook.
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In closed stands, the crown is narrow and slender in young trees and irregularly broad in old trees. Trunks are usually free of branches on the lower in closed stands. Trunks are often forked, and usually decayed and hollow in older trees. The bark is thin and smooth in young trees, becoming thick, ridged, and plate-like with age.
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Uncobasidium forms a crust-like fruit body, which is spread out on the surface of the substrate. Its texture is softly membranous or byssoid (as if made of fibers). The hyphal system is monomitic, meaning it contains only generative hyphae. Individual hyphae are distinct when viewed with microscopy, and they range from thin to becoming thick walled, with clamp connections.
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It usually has flaking bark, occasionally not flaking and becoming thick and rugged. Flowers and fruit are round and burr-like, borne in clusters of between 2 and 6 on a stem. Considerable variation exists among trees in the wild, and this may be complicated by crossbreeding with planted London planes (Platanus x acerifolia), the hybrid of P. orientalis with the American sycamore (Platanus occidentalis).
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First seen in London in 1821, they were particularly common in the mid- to late nineteenth century in American and British printing and have been revived occasionally since then. They effectively become slab serif designs because of the serifs becoming thick, and are often characterised as part of that genre. In recent times, the reverse-contrast effect has been extended to other kinds of typeface, such as sans-serif designs.
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A document printed in 1836, showing Didone (body text), 'Italian' (the word 'proceedings') and early sans-serif fonts. An eccentric method of reworking and parodying Didone typefaces has long been to invert the contrast, making the thin strokes thick and the thick strokes thin. First seen around 1821 in Britain and occasionally revived since, these are often called reverse- contrast fonts. They effectively become slab serif designs because of the serifs becoming thick.
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Initially (after 3–4 weeks), minute dull flakes, thickening to form dry irregular masses standing high above the culture medium surface. Eventually confluent growth over the whole culture surface, forming a rough waxy blanket, becoming thick and wrinkled and reaching up the sides of the container. Yellow when they are first visible, darkening to deep yellow and eventually brick red, if exposed to light. In fluid media, growth on the surface only, unless a wetting agent (e.g.
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Bark Fraxinus pennsylvanica is a medium-sized deciduous tree reaching (rarely to ) tall with a trunk up to in diameter. The bark is smooth and gray on young trees, becoming thick and fissured with age. The winter buds are reddish- brown, with a velvety texture. The leaves are long, pinnately compound with seven to nine (occasionally five or eleven) leaflets, these (rarely ) long and broad, with serrated margins and short but distinct, downy petiolules a few millimeters long.
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Male flowers Seeds of Fraxinus excelsior, popularly known as "keys" or "helicopter seeds", are a type of fruit known as a samara It is a large deciduous tree growing to (exceptionally to ) tall with a trunk up to (exceptionally to ) diameter, with a tall, narrow crown. The bark is smooth and pale grey on young trees, becoming thick and vertically fissured on old trees. The shoots are stout, greenish-grey, with jet-black buds (which distinguish it from most other ash species, which have grey or brown buds). The leaves are opposite, long, pinnately compound, with 7–13 leaflets with coarsely serrated margins, elliptic to narrowly elliptic, long and broad and sessile on the leaf rachis.
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