. Lessons in botany. Botany. FERN'S. 161 leaf and place it under the low power of the microscope, so that the full rounded sporangia can be seen, in a short time we note that the sporangium opens, the upper half curls backward as shown in fig. 138, and soon it snaps quickly, to near its former position, and the spores are at the same time thrown for a considerable distance. This movement can sometimes be seen with the aid of a good hand lens. 266. How does this opening and snapping of the sporan- gium take place ?—We are now more curious than ever to see just how this opening and how the snapp
. Lessons in botany. Botany. FERN'S. 161 leaf and place it under the low power of the microscope, so that the full rounded sporangia can be seen, in a short time we note that the sporangium opens, the upper half curls backward as shown in fig. 138, and soon it snaps quickly, to near its former position, and the spores are at the same time thrown for a considerable distance. This movement can sometimes be seen with the aid of a good hand lens. 266. How does this opening and snapping of the sporan- gium take place ?—We are now more curious than ever to see just how this opening and how the snapping of the sporangium takes place. We should now mount some of the fresh sporangia in water and cover with a cover glass for microscopic examination. A drop of glycerine should be placed it one side of the cover ^lass on the slip so that the edge of the glycerine will come in touch with the water. Now as one looks through the micro- scope to watch the sporan- gia, the water should be drawn from under the cover glass with the aid of some bibulous paper, like filter Fig. 136. n,„pr nlnrpH ^MceHular capitate Eair. opposite side from the glycerine. As the glycerine takes the place of the water around the sporangia it draws the water out of the cells of the annulus, just as it took the water out of the cells of the spirogyra as we learned some time ago. As the water is. 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 Atkinson, George Francis, 1854-1918. New York, H. Holt and company
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