File:Text-book of structural and physiological botany (1877) (14589967858).jpg

Identifier: textbookofstruct00thom (find matches)
Title: Text-book of structural and physiological botany
Year: 1877 (1870s)
Authors: Thomé, Otto Wilhelm, 1840- Bennett, Alfred William, 1833-1902
Subjects: Plant physiology
Publisher: New York : J. Wiley & sons
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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mited to a par-ticular part, the hymeiiium. Thus, for example, in themushroom-shaped Fungi (Agaricini) the spores are formedonly on delicate plates on the under side of the pileus.In many cases the receptacle is naked ; in others the lowerside of the pileus is covered with a membrane which isruptured when near maturity (Fig. 392) (velum partiale or Fig. 392.—Mushroom, Agariais canipestris ; one young globular and two maturereceptacles, a pileus ; b lamellae ; c annulus (natural size). annuhis); or often the pileus and stalk are both envelopedin such a membrane (velum U7iive7^sale), or occasionally bothare present (Fig. 393 i). In the Phalloideae and Tuberacese,as Bovista and Ttibe?-^ the hymenium, to which the termgleba is also given in these cases, is distributed intochambers, and is found in simple or double sacs or recep-tacles, the peridia (Fig. 394), enclosed on all sides. ThePyrenomycetes, finally, have small flask-shaped receptacles, special Morphology and Classification. 265
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Fig. 393,—I. Agaria^s rubescens ; the receptacle (natural size) ; .? stipes ; v velumuniversale, a velu7npartiale or annulus. II. Part of a longitudinal sectionthrough the hymenium of another species : a pseudo-parenchynia ; b hymenuim ;c spores, (x 400.) 266 Structural and Physiological Botany, the conceptacles or perithecia^ usually opening outwards bya small orifice, the simple internal cavity of which is almostcompletely filled up by the soft hymenium (Fig. 395). The reoroductive cells are either the result of a process IT.

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