Download A Field Guide to Venomous Animals and Poisonous Plants: by Roger Caras, Visit Amazon's Steven Foster Page, search PDF

By Roger Caras, Visit Amazon's Steven Foster Page, search results, Learn about Author Central, Steven Foster, , Roger Tory Peterson

This crucial advisor to defense within the box positive factors ninety venomous animals and greater than 250 toxic crops and fungi. The 340 line drawings make identity quickly and easy; one hundred sixty species also are illustrated with colour images.

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Extra info for A Field Guide to Venomous Animals and Poisonous Plants: North America North of Mexico

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The fertilized egg cell becomes almost at once surrounded by a wall, which rapidly thickens, and forms a resting spore. As the spore ripens, it loses its green color, becoming colorless, with a few reddish brown specks scattered through it (F). In some species the sexual organs are borne directly on the filament (Fig. 21, G). Large zoöspores are formed in some of the green felts (Fig. 22, A), and are produced singly in the ends of branches that become swollen, dark green, and filled with very dense protoplasm.

They separate at the time of fertilization to allow the spermatozoids to enter the oögonium. The antheridium consists at first of a basal cell and a terminal one. The latter, which is nearly globular, divides into eight nearly similar cells by walls passing through the centre. ). These cells, especially the outer ones, develop a great amount of a red pigment, giving the antheridium its characteristic color. The diameter of the antheridium now increases rapidly, and the central cells separate, leaving a large space within.

Curiously enough, neither the cell which is immediately fertilized, nor the one beneath it, undergo any further change; but two of the other peripheral cells on opposite sides of the filament grow rapidly and develop into large, irregular masses of spores (Fig. 29, D III, IV). While the plant here described may be taken as a type of the group, it must be borne in mind that many of them differ widely, not only in the structure of the plant body, but in the complexity of the sexual organs and spores as well.

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