. The Biological bulletin. Biology; Zoology; Marine biology. 260 S, BINGHAM AND J. A. SCHIFF the thallus. Ultimately, a thickened end representing the future thallus, a thin connecting portion which will become the stipe, and a basal portion which will become the holdfast can he seen. Thalli of Prasiola normally form aplanospores at their edges. Normal vegetative cells are 7-9 /tm in diameter (Fig. 1) and these enlarge to about 11-12 pm in becoming aplanospores which are then released, attach, and develop into new plants (Taylor, 1957). Figure 1 shows that grinding releases large numbers of ve
. The Biological bulletin. Biology; Zoology; Marine biology. 260 S, BINGHAM AND J. A. SCHIFF the thallus. Ultimately, a thickened end representing the future thallus, a thin connecting portion which will become the stipe, and a basal portion which will become the holdfast can he seen. Thalli of Prasiola normally form aplanospores at their edges. Normal vegetative cells are 7-9 /tm in diameter (Fig. 1) and these enlarge to about 11-12 pm in becoming aplanospores which are then released, attach, and develop into new plants (Taylor, 1957). Figure 1 shows that grinding releases large numbers of vegetative cells and a smaller number of aplanospores. Both populations attach equally well (Fig. 1) since the distribution of sizes after grinding and after attachment are the same. Since more than 70% of the attached cells released by grinding go on to C/) Ll. o CD CELLS BEFORE ATTACHMENT. CELLS AFTER ATTACHMENT 16 DIAMETER (/im) Figure 1. Distribution of cell sizes after release by grinding (upper) anil after attach- ment and washing off of unattached cells (lower). Note similarity of distributions with vegeta- tive cells peaking at 8 /ira and aplanospores at 12 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 Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report; HighWire Press. Lancaster, Pa. [etc. ] : Lancaster Press, inc. [etc. ]
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