. Elementary plant physiology. Plant physiology. 98 Elementary Plant Physiology. plants with such tubercles can fix and make use of the free nitrogen of the air. 102. Nutrition of a saprophyte.—No in- dependent saprophytes, or species which live on dead organic matter, are known among the seed plants. The fungi comprise a large number of species which obtain their nutri- ment in this manner. Their method of growth and absorption of food may be observed as fol- Fig. 71.—Seedling of hemlock {Tsaga Cana- densis) with mycorrhizal roots. After Lloyd. lows: place under a bell jar for two days a frag
. Elementary plant physiology. Plant physiology. 98 Elementary Plant Physiology. plants with such tubercles can fix and make use of the free nitrogen of the air. 102. Nutrition of a saprophyte.—No in- dependent saprophytes, or species which live on dead organic matter, are known among the seed plants. The fungi comprise a large number of species which obtain their nutri- ment in this manner. Their method of growth and absorption of food may be observed as fol- Fig. 71.—Seedling of hemlock {Tsaga Cana- densis) with mycorrhizal roots. After Lloyd. lows: place under a bell jar for two days a fragment of bread which has been moistened with water. A number of slender hyphse of a mold may be seen arising from the bread. Tear apart a bit of the bread, and ex- amine with a magnification of about 60 diameters. The ab- sorbent branches of the mycelia ^. , . . , Fig. 72.—Longitudinal section of may be seen ramifying through root of hemlock (^Tsuga Cana- the bread. These submerged *"™5- The outer, shaded layer is inhabited by a fungus. After Har- hyphffi take up sugars and other 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, London [etc. ] Longmans, Green, and Co.
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