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Ontogénie des laticifères du système primaire de l’Hevea brasiliensis: une étude ultrastructurale et cytochimique
The development of the laticifers of the primary system in the roots of young seedlings of Hevea is investigated. The nucleus of the maturing secretory cells progressively diminishes in size, thusExpand
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THE ORIGIN OF LAND PLANTS: A NEW LOOK AT AN OLD PROBLEM
Summary Although current ideas on evolution of the earth's atmosphere vary widely, it seems certain that when plants first invaded the land habitat they were exposed to solar ultraviolet radiationExpand
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Functional Organization of the Bark of Hevea brasiliensis (Rubber Tree): A Structural and Histoenzymological Study
Summary The secondary phloem of Hevea brasiliensis presents a repetitive organization in which alternate bands of laticifers, parenchyma cells and sieve tubes occur. The majority of the laticiferousExpand
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Studies on the development of the conducting tissue-system in the gametophytes of somePolytrichales
SummaryAn extensive system of endoplasmic reticulum is frequently encountered in the most highly developed leptoids at certain stages of their active life. This ER shows associations with theExpand
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