. Botany of the living plant. Botany. Fig. 3S6. Polyporus igniarius. Section through an old fructification, showing annual zones of growth. a=point of attachment upon the tree which is its host. The porous hymenium is directed downwards, [h nat. size.) (From Strasburger.) though it is altered from what was probably its normal and original course. In the rest of the Basidiomycetes such evidence is wanting. They may provisionally be held to be saprophytes and parasites which were descended from an ancestry with normal sexuality, but have ad vanced further in the elimination of their sexual proce
. Botany of the living plant. Botany. Fig. 3S6. Polyporus igniarius. Section through an old fructification, showing annual zones of growth. a=point of attachment upon the tree which is its host. The porous hymenium is directed downwards, [h nat. size.) (From Strasburger.) though it is altered from what was probably its normal and original course. In the rest of the Basidiomycetes such evidence is wanting. They may provisionally be held to be saprophytes and parasites which were descended from an ancestry with normal sexuality, but have ad vanced further in the elimination of their sexual process. The Basidio mycetes are characterised by their basidia (Fig. 374, P- 44i) borne on fruit-bodies which are often large, of various form and brightly coloured These are produced upon a mycelium which acquires the necessary nourish ment sometimes parasitically, but more commonly from saprophytic sources. The basidia are borne in various ways, and this gives distinctive characters to the main groups of these Fungi. Thus in the Gasiero- mycetes the fructification is closed, the basidia being produced inter- nally, and the spores set free by rupture, as in the Puff-Bails. In the Hymenomycetes the basidia are borne collectively in a definite layer. Fig. 3S7. Psalliota {Agaiictis) cainpesiris. Mush- room. The hymenium covers the surface of the radiating, downward-directed gills. To the right a young fructification. (Reduced.) (From Strasburger.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bower, F. O. (Frederick Orpen), 1855-1948. London, Macmillan and co. , limited
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
