| 单词 | basidium |
| 例句 | The basidiocarp bears the developing basidia on the gills under its cap. Fundamentals of Biology 2015-01-01T00:00:00Z Between the nuclear association and the nuclear fusion in the basidium many thousands of cell generations may be intercalated. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z Exobasidiine�, a family of parasitic basidiomycetous Fungi, resembling the Exoascine� in most respects, but producing basidia in place of asci, a remarkable instance of parallel evolution. The New Gresham Encyclopedia Volume 4, Part 3: Estremoz to Felspar 2011-04-14T02:00:59.373Z They are characterized by their principal spores being produced externally, usually in fours, upon an organ called a basidium. The New Gresham Encyclopedia. Vol. 1 Part 3 Atrebates to Bedlis Saccardo, in defining the terms which he employs, accepts the term spores as applicable exclusively to the naked spores supported on basidia, as found in the Basidiomycete�. Student's Hand-book of Mushrooms of America, Edible and Poisonous The “gills” are actually compacted hyphae on which the basidia are borne. Fundamentals of Biology 2015-01-01T00:00:00Z The sporophyte may be considered to begin at the stage of nuclear association and end with the nuclear reduction in the basidium. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z The pileus or cap bears on its under surface radiating plates or gills, consisting of the hymenium, over which are thickly scattered the basidia, each surmounted by four spicules, and on each spicule a spore. Fungi: Their Nature and Uses The young basidium contains two nuclei, which later fuse; the fusion-nucleus then undergoes two successive divisions, involving a reduction of chromosomes, and each of the four resultant nuclei passes through a sterigma into a basidiospore. The New Gresham Encyclopedia. Vol. 1 Part 3 Atrebates to Bedlis Paraphyses may be present as aborted basidia, but cystidia are rarely distinguished. Student's Hand-book of Mushrooms of America, Edible and Poisonous Gills on the underside of the mushroom cap contain cells called basidia. Fundamentals of Biology 2015-01-01T00:00:00Z Life-history always very simple, no well-marked alternation of generations; basidium borne directly on the mycelium. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z As the spores approach maturity, the connection between their contents and the contents of the basidia diminishes and ultimately ceases. Fungi: Their Nature and Uses The basidia are nearly round with four rather stout, elongated sterigmata, spores very nearly round. The Mushroom, Edible and Otherwise Its Habitat and its Time of Growth In the young stage the basidia in the Hypog�i are easily distinguished by the aid of the microscope. Student's Hand-book of Mushrooms of America, Edible and Poisonous These cystidia extend above the basidia, and the ends are rounded so that sometimes they appear capitate. Studies of American Fungi. Mushrooms, Edible, Poisonous, etc. A, Young basidium with the two primary nuclei. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z The cystidia are usually larger than the basidia, varying in size and form in different species. Fungi: Their Nature and Uses In the mushrooms, puff-balls, etc., we find the spores were borne on the ends of basidia, usually four spores on each. The Mushroom, Edible and Otherwise Its Habitat and its Time of Growth Montagne and Berkeley are credited with being the first to show the true structure of the hymenium in the puff-balls, as well as to demonstrate the presence of basidia. Student's Hand-book of Mushrooms of America, Edible and Poisonous The basidia are abruptly club-shaped, rather distant and separated regularly by rounded cells, four spored. Studies of American Fungi. Mushrooms, Edible, Poisonous, etc. C, A basidium before the four nuclei derived from the secondary nucleus of the basidium have passed into the four basidiospores. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z The evidence seems to be in favour of regarding the cystidia as barren conditions of basidia. Fungi: Their Nature and Uses This genus resembles Clavaria, but is identified by being somewhat gelatinous and viscid when moist and rather horn-like when dry, but especially by its two-lobed basidia. The Mushroom, Edible and Otherwise Its Habitat and its Time of Growth This important discovery led to the correlating of the Gasteromycetes with the Hymenomycetes under the common title Basidiomycetes, both having the spores borne upon basidia. Student's Hand-book of Mushrooms of America, Edible and Poisonous The spores are borne on club-shaped basidia, as in the common mushrooms. Studies of American Fungi. Mushrooms, Edible, Poisonous, etc. The Tremellinaceae are characterized by the possession of basidia which are divided by two vertical walls at right angles to one another. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z The hymenium is sinuous and convolute, bearing basidia with sterigmata and spores in the cavities. Fungi: Their Nature and Uses Figure 2 will show how these basidia appear on the hymenial layer when strongly magnified. The Mushroom, Edible and Otherwise Its Habitat and its Time of Growth The basidia of the Gasteromycetes, though resembling those of the Hymenomycetes, are more variable in form and the number of the spores not so constant. Student's Hand-book of Mushrooms of America, Edible and Poisonous The spore-bearing cells are basidia; the others are called paraphyses. Studies of American Fungi. Mushrooms, Edible, Poisonous, etc. Autobasidiomycetes.—In this by far the larger division of the Basidiomycetes the basidia are undivided and the four basidiospores are borne on short sterigmata nearly always at the apex of the basidium. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z All parts of these reddish individuals seemed more or less infected with this disintegration, the basidia divided by transverse diaphragms into several cylindrical or oblong pieces, which finally become free. Fungi: Their Nature and Uses Upon each of these basidia are in some species two, usually four, slender projections upon which the spores are produced. The Mushroom, Edible and Otherwise Its Habitat and its Time of Growth They have no hymenium and no true basidia, and are non-sexual in their reproduction. Student's Hand-book of Mushrooms of America, Edible and Poisonous They resemble each other very much, except that the basidia bear four sterigmata and a spore on each. Studies of American Fungi. Mushrooms, Edible, Poisonous, etc. There is also a further reduction in that the basidium is not derived from a teleutospore but is borne directly on the mycelium. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z In F, a basidium is shown, with the young spores just forming. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses In Figure 2 a number of sterile cells will be seen which resemble the basidia except that the latter bear four sterigmata upon which the spores rest. The Mushroom, Edible and Otherwise Its Habitat and its Time of Growth The chief distinction of the Basidiomycetes is that the naked spores are borne on the summits of certain supporting bodies, termed basidia. Student's Hand-book of Mushrooms of America, Edible and Poisonous These sacs, or asci, are grouped together, lying side by side, forming the fruiting surface or hymenium, much as the basidia form the fruiting surface in the mushrooms. Studies of American Fungi. Mushrooms, Edible, Poisonous, etc. Formerly, before the relationship of promycelium and basidium were understood, the Uredineae were considered as quite independent of the Basidiomycetes. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z This hymenium is composed of a number of swollen, club-shaped cells, called basidia, and close to them, side by side, are sterile, elongated cells, named paraphyses. Among the Mushrooms A Guide For Beginners Among these basidia and sterile cells will frequently be seen an overgrown bladder-like sterile basidium which projects beyond the rest of the hymenium, and whose use is not as yet fully known. The Mushroom, Edible and Otherwise Its Habitat and its Time of Growth Ascomycetes.—In the plants of this family the spores are not supported upon basidia, but instead are enclosed in minute sacs or asci formed from the fertile cells of a hymenium. Student's Hand-book of Mushrooms of America, Edible and Poisonous The basidia are peculiar to the order, are deeply seated in the substance of the plant, rounded or globose, and divided into four cells in a cruciate manner. Studies of American Fungi. Mushrooms, Edible, Poisonous, etc. Most of Basidiomycetes are characterized by the large sporophore on which the basidia with its basidiospores are borne. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z There is one great group of fungi called Basidiomycetes, so named from having their stalked spores produced on basidia. Among the Mushrooms A Guide For Beginners The young basidia as seen in Figure 2 are filled with a granular protoplasm. The Mushroom, Edible and Otherwise Its Habitat and its Time of Growth The basidium is a unicellular or multicellular structure from which four basidiospores arise as outgrowths; it starts as a binucleate structure, but soon, like the ascus, becomes uninucleate by the fusion of the two nuclei. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z The basidia are like those of the genus, globose, sunk in the substance of the plant, and terminate with four long, slender, sterigmata which rise to the surface and bear the spores. Studies of American Fungi. Mushrooms, Edible, Poisonous, etc. Protobasidiomycetes.—This, by far the smaller division of Basidiomycetes, includes those forms which have a septate basidium. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z The basidia are formed on the end of threadlike branched bodies which grow at the apex, and are called hyphæ. Among the Mushrooms A Guide For Beginners Each projection or sterigma soon swells at its extremity into a bladder-like body, the young spore, and, as they enlarge, the protoplasm of the basidium is passed into them. The Mushroom, Edible and Otherwise Its Habitat and its Time of Growth The mycelium is always found to contain conjugate nuclei before the formation of basidia, but the point at which the conjugate condition arises seems very variable. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z The long cells bearing the oval spores are the basidia. Studies of American Fungi. Mushrooms, Edible, Poisonous, etc. The first named contains a small number of forms with the basidium divided like the promycelium of the Uredineae. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z Other series of modifications arise in which the tissues corresponding to the stroma invest the sporogenous hyphal ends, and thus enclose the spores, asci, basidia, &c., in a cavity. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z When the four spores are full grown they have consumed all the protoplasm in the basidium. The Mushroom, Edible and Otherwise Its Habitat and its Time of Growth This conjugate condition is finally brought to a close by the nuclear fusion in the basidium. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z The layer just beneath the basidia is usually more or less modified, being often composed of small cells different from the rest of the trama. Studies of American Fungi. Mushrooms, Edible, Poisonous, etc. Basidiales.—This very large group of plants is characterized by the possession of a special type of conidiophore—the basidium, which gives its name to the group. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z Their number is much smaller than that of the basidia, but in some species where they are colored they may greatly change the appearance of the gills. Studies of American Fungi. Mushrooms, Edible, Poisonous, etc. The spores are borne on basidia as explained in Figure 2, page 6. The Mushroom, Edible and Otherwise Its Habitat and its Time of Growth |
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