. Principles of the anatomy and physiology of the vegetable cell. Plant cells and tissues. THE VEGETABLE CELL. 12S structure of tlie pollen-grains. Just as the latter are developed in the anther without the co-operation of another organ, does this occur also in the spores. In certain Cryptogarnia (the Rhizocarpese and Lycopodiacese) we find the joeculiar condition, that spores of two kinds are developed simultaneously, in a wholly analogous manner in parent-cells, in capsular receptacles of two kinds, the spores larger and smaller, possessing exactly the same structure, except that one kind ar
. Principles of the anatomy and physiology of the vegetable cell. Plant cells and tissues. THE VEGETABLE CELL. 12S structure of tlie pollen-grains. Just as the latter are developed in the anther without the co-operation of another organ, does this occur also in the spores. In certain Cryptogarnia (the Rhizocarpese and Lycopodiacese) we find the joeculiar condition, that spores of two kinds are developed simultaneously, in a wholly analogous manner in parent-cells, in capsular receptacles of two kinds, the spores larger and smaller, possessing exactly the same structure, except that one kind are larger and have a tougher outer coat. But in the Rhizocarpese, only the larger exercise the function of spores, the smaller, as above stated, developing the cells which contain seminal filaments; in the Lycopodiaceoe, on the contrary, both kinds of spores produce plants.* The germination of the spores is as little dependent as their origin upon a previous impregnation derived from the antheridia, unless perhaps this be the case with the Charas, in which the Fig. 50. Fig, 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 Mohl, Hugo von, 1805-1872; Henfrey, Arthur, 1819-1859. London, J. Van Voorst
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