. Practical text-book of plant physiology. Plant physiology. 68 RELATIONS OF PLANTS TO WATER 105. Reactions of Plasmodia to Water; Hydrotropism. A naked mass of protoplasm offers some experimental features of' advantage over those of a vegetable structure encased in cellulose membranes. The plasmodial forms of myxomycetes may be found in the spring, summer and autumn on decaying logs; leaves, and stumps in for- ests, or they may be grown from spores of Tri- chia, Arcyria, Stemonitis, Didymium or other con- venient forms. Plasmodia collected in a forest may be preserved and taken into the labor
. Practical text-book of plant physiology. Plant physiology. 68 RELATIONS OF PLANTS TO WATER 105. Reactions of Plasmodia to Water; Hydrotropism. A naked mass of protoplasm offers some experimental features of' advantage over those of a vegetable structure encased in cellulose membranes. The plasmodial forms of myxomycetes may be found in the spring, summer and autumn on decaying logs; leaves, and stumps in for- ests, or they may be grown from spores of Tri- chia, Arcyria, Stemonitis, Didymium or other con- venient forms. Plasmodia collected in a forest may be preserved and taken into the laboratory by lifting a fragment of the material on which they are growing, and placing in a jar or closed tin box. Spores may be germinated on pieces of the material on which they were grown in a moist chamber at temperatures of 20 to 250 C. Cut a piece of filter paper the size of a microscopic slide and saturate it in water, then lay it on a slide. Now coat a section at one end inclusive of about three sq. cmm. with liquefied gelatine. Transfer a plasmodium to the filter paper about the center of the slide. Place the pre- paration in a small moist chamber, ventilated in such manner that the filter paper will dry slowly through a period of several hours or a day. The moisture will be retained longer by. Fig. 28. Apparatus for the demonstration of hydrotropism of roots, h, h, wide-mouthed bottle, s, sand, kk, seedlings, p, showing arrangement of filter paper, tr, tr, openings in dish, w, w, curving roots. After 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 MacDougal, Daniel Trembly, 1865-1958. New York [etc. ] Longmans, Green, and Co.
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