callus

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callus:

see corns and callusescorns and calluses,
thickenings of the outer layer of skin where there is irritation or constant pressure. Corns are cone-shaped with their points protruding into the dermis, or inner layer of skin. They usually have hard, shiny surfaces surrounded by red, painful areas.
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Callus

 

(1) Tissue formed in plants on the surface of a wound (cracks, taps, the bases of cuttings, and areas of concrescence of stock and scion). A callus promotes the healing of wounds. Consisting of thin-walled parenchymal cells, a callus develops when there is cell division of any living tissue of the plant (cambium or phloem) in the peripheral zone of the pith, lying next to the protoxylem. Adventitious roots and buds, particularly with grafting, often develop in the callus. (2) Corpus callosum, an accumulation of callóse that obstructs the sieve plate when the sieve tubes of the phloem age. Use of the term in this sense is obsolete.


Callus

 

a thickening of the horny layer of skin as a result of constant pressure or friction. Calluses usually appear on the palms, soles, and other parts of the body that are in constant contact with tough surfaces. The cracks formed on the surface of a callus may hinder one’s ability to work, and they can also be portals of entry for pyogenic microbes, resulting in such conditions as erysipelatous inflammations and phlegmons.

callus

[′kal·əs]
(botany)
A thickened callose deposit on sieve plates.
A hard tissue that forms over a damaged plant surface.
(medicine)
Hard, thick area on the surface of the skin.

callus

1. an area of skin that is hard or thick, esp on the palm of the hand or sole of the foot, as from continual friction or pressure
2. an area of bony tissue formed during the healing of a fractured bone
3. Botany
a. a mass of hard protective tissue produced in woody plants at the site of an injury
b. an accumulation of callose in the sieve tubes
4. Biotechnology a mass of undifferentiated cells produced as the first stage in tissue culture
References in periodicals archive ?
Evaporatoria greyish brown, other parts of ventral surface thorax and abdomen dark brown, prespiracular portions of spiracular callosities of abdominal sternites III-VII yellowish (Fig.
5 mm above the base, as well as 2 conspicuous longitudinal callosities about equaling the anthers; filaments terete, greenish toward the apex, the antepetalous ones ca.
5-4 mm, free, entire, rose, inconspicuously and sparsely pilose-glandulose, the posterior ones alatecarinate, the anterior one carinate at least at base; petals narrowly subspatulate, apex rounded and slightly emarginated to remotely apiculate, 15-16 x 4 mm, free, white, at anthesis erect except for the subspreading distal portion, bearing 2 laminate, cupulate, obtuse, irregularly crenulate, upwardly to downwardly oriented appendages 5-6 mm above the base, as well as 2 conspicuous longitudinal callosities slightly shorter than the anthers; filaments terete, white, the antepetalous ca.
2 mm above the base, as well as 2 conspicuous longitudinal callosities equaling the anthers, filaments the antepetalous ones 13-14 mm long, adnate to the petals for 8-9 mm, the antesepalous ones 14-15 mm long, free, anthers 2-2.
5 mm long, free, glabrous, entire, greenish except for the pale castaneous-yellow central zone, the posterior ones alate carinate with keels decurrent on the ovary; petals subspatulate, apex emarginate and inconspicuously apiculate, 20-24 x 5 mm, free, green, subspreading-recurved at anthesis, the blades sparsely and conspicuously glandulose adaxially, without any appendages but bearing 2 well developed longitudinal callosities 15-18 mm long; stamens shorter than the petals but exposed at anthesis; filaments complanate and dilated toward the apex, the antepetalous ones adnate to the petals for ca.
4 mm above the base, as well as 2 conspicuous longitudinal callosities distinctly shorter than the antepetalous filaments; filaments terete, greenish, the antepetalous ones ca.
5-6 mm wide) and bearing well developed callosities (vs.
It is difficult to decide on its closest affinity in Aechmea: It does resemble some members of subgenus Chevaliera due to its robust size, inflorescence densely flowered and densely white-lepidote except for the glabrous petals and the densely white-lanate rachis, petals distinctly connate at base, without any appendages but bearing well developed lateral callosities, besides the pollen apparently sulcate with psilate to microreticulate exine.
5-9 mm, white, distinctly exceeding the stamens, connate for 7-13 mm in a common tube with the filaments and style, bearing 2 well developed lateral callosities ca.
the paratype #2), the adaxial ones alate-carinate with keels decurrent on the ovary, the abaxial one ecarinate; petals spathulate, rounded to obtuse and inconspicuously and slenderly apiculate under a lens, slightly cucullate, 18-20 x 5 mm, free, erect at anthesis and forming a tubular corolla except for the suberect apex, white toward the apex, greenish-white in their central portion, bearing 2 irregularly, long digitate-lacerate, downwardly oriented appendages 5-6 mm above the base, as well as 2 conspicuous longitudinal callosities shorter to nearly equaling the filaments; filaments terete, pale greenish, 13-15 mm long, the antepetalous ones adnate to the petals for 6-7 mm, the antesepalous ones free and slightly exceeding the antepetalous ones; anthers green, ca.