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Sentences for "basidia "
[D] A closer examination of the hymenium will reveal the fact that the basidia are accompanied by other bodies, often larger, but without sterigmata or spores; these have been termed cystidia, and their structure and functions have been the subject of much controversy.
The basidia are usually expanded upwards, so as to have more or less of a clavate form, surmounted by four slender points, or tubular processes, each supporting a spore; the contents of these cells are granular, mixed apparently with oleaginous particles, which communicate through the slender tubes of the spicules with the interior of the spores.
As the spores approach maturity, the connection between their contents and the contents of the basidia diminishes and ultimately ceases.
Léveillé[O] was of opinion that [Pg 26] the basidia of the Tremellini were monosporous, whilst M.
Although agreeing in this, they differ in other features, especially in the globose form of the basidia, mode of production of the spicules, and, finally, the division of the basidia into two, three, or four cells by septa which cut each other in their axis.
The basidia are cylindrical or clavate, filled with coloured granular matter; each of these bifurcates at the summit, and gradually elongates into two very open branches, which are attenuated above, and ultimately each is crowned by a spore.
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.
When a section is made of the fungus, whilst still enclosed in the volva, the hymenium is found to present numerous cavities, in which basidia are developed, each surmounted by spicules (four to six) bearing oval or oblong spores.
The hymenium is sinuous and convolute, bearing basidia with sterigmata and spores in the cavities.
In earlier stages, and before the hymenium is ruptured, the spores have been found to harmonize with those of Hymenomycetes in their mode of production, since basidia are present surmounted each by four spicules, and each spicule normally surmounted by a spore.
Basidiospores is a term which we may employ here to designate all spores borne at the tips of such supports as are found in the Hymenomycetes and Gasteromycetes, to which the name of basidia has been given.
Figure 2 will show how these basidia appear on the hymenial layer when strongly magnified.
Upon each of these basidia are in some species two, usually four, slender projections upon which the spores are produced.
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.
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.
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