. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 378 E. A. ANDREWS. black aggregates crowded on the young leaves nearly to the tip where only the newest leaves were as yet unoccupied; by August 18 the extension of the Folliculina hosts had ceased. The tips of the growing Elodea were now bare or free from Folliculina back some twenty leaves from the tip and many of the old dwel- lings on the lower leaves were deserted. These dense black colonies on old leaves contained in fact but few living FIG. 5. Photograph of natural size sprays of Elodea preserved to sho
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 378 E. A. ANDREWS. black aggregates crowded on the young leaves nearly to the tip where only the newest leaves were as yet unoccupied; by August 18 the extension of the Folliculina hosts had ceased. The tips of the growing Elodea were now bare or free from Folliculina back some twenty leaves from the tip and many of the old dwel- lings on the lower leaves were deserted. These dense black colonies on old leaves contained in fact but few living FIG. 5. Photograph of natural size sprays of Elodea preserved to show successive phases of colonization in 1914. Spray on left has grown enough to form flower but as yet but a very few .isolated individual Folliculina have settled upon it. The next spray shows scattered tubes all along its length. The third spray shows dense aggregations of colonies even up to the tips of the rapidly unfolding new leaves. The fourth spray illustrates the subsidence in colonization: the new colonies no longer cover the leaves at the tip of the spray but these grow more rapidly than the new colonists occupy them and are left more nearly free from any Folliculinas. By August 26 this falling off in the colonization and rapid dis- appearance of Folliculina was most pronounced: the Elodea sprays showed an abrupt transition from the lower leaves black from dense population of tubes, for the most part empty, to the upper leaves only sparsely inhabited with scattered individuals. Evi- dently some sudden change had operated not only to check the previously rapid spread of the Folliculinas onto new leaves but to. 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
