File:Text-book of structural and physiological botany (1877) (14590039829).jpg

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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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Fig. 45e.—Isoeies laciistris ; I. the whole plant (natural size) ; II. transverse sectionthrough the peculiarly thickened stem (natural size); III. macrospore (x 60); IV. longitudinal section through the pro-embryo with an archegonium « (x 40) ; V. microspore with three mother-cells of antherozoids (x 500) ; VI. antherozoid- (x 500).
Text Appearing After Image:
Fig. 452.—Transverse section through the stem of Lycopodium an7iothniiii; o epi-dermis ; A R outer cortex ; j r inner cortex : s fibrous sheath ; p vascular bundlesheath or the thin-walled parenchyma surrounding the vascular bundle ; hxylem-, b bast-portion of ihe vascular bundle \ Bsp,Bcp, leaf-traces, or branches ofthe vascular bundle proceeding to the leaves ( x 120). 332 Structural and Physiological Botany. of sporangia (Fig. 450 b, ii., hi.) : macrosporangia^ inwhich are formed four large macrospoi-es ; and microsporangia^in which a greater number of much smaller spores, the mi-C7ospores^ are developed. The microspores are the an-theridia, and break up into a small number of cells, oneof which remains unproductive and may be regarded asan abortive pro-embryo, while antherozoids are developedin the remainder. The macrospores, on the other hand, asin the Rhizocarpeae, produce a transitory pro-embryo or pro-thallium, which bears archegonia opening outwardly (Fig.450 B, IV.), and i

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Thomé, Otto Wilhelm, 1840-;

Bennett, Alfred William, 1833-1902
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29 July 2014

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