. The structure and development of mosses and ferns (Archegoniatae). om the large prothallial cell (Fig. 191, B). The young rhi-zoid contains chlorophyll, but not so much as the larger germination proceeds the chloroplasts separate and increasein size. They are often arranged in lines extending from thelarge nucleus to the periphery of the cell. As a general thing, 348 MOSSES AND FERNS CHAP. the growth of the prothalhum is exactly opposite to that ofthe first rhizoid (bi-polar germination), and Kny ((5), p. 12)lays a good deal of stress upon this, as distinguishing Osmundafrom the Poly
. The structure and development of mosses and ferns (Archegoniatae). om the large prothallial cell (Fig. 191, B). The young rhi-zoid contains chlorophyll, but not so much as the larger germination proceeds the chloroplasts separate and increasein size. They are often arranged in lines extending from thelarge nucleus to the periphery of the cell. As a general thing, 348 MOSSES AND FERNS CHAP. the growth of the prothalhum is exactly opposite to that ofthe first rhizoid (bi-polar germination), and Kny ((5), p. 12)lays a good deal of stress upon this, as distinguishing Osmundafrom the Polypodiacese; but it is not at all uncommon for , especially, to have the axis of growth of the rhi-zoid almost or quite at right angles to that of the prothallium,exactly as in the Polypodiacese. Where the germination istruly bi-polar the exospore is pushed up with the growing pro-thallium, and appears like a cap at its apex, but if the rhizoid islateral, the exospore remains at the base. In 0. Claytoniana there are usually several transverse wallsA,
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Keywords: ., bookauthorcampbelldouglashought, bookcentury1900, bookdecade1910
