. Botany for agricultural students . Botany. 380 THALLOPHYTES or they may have slender branching bodies Hke the one shown in Figure 334. The slender branches may be erect, prostrate, or hang in festoons from the branches of trees or other sup- ports. A Lichen, although regarded as a plant, is a structure formed by the association of a Fungus and an Alga. The Fungus in- volved is in nearly all cases an As- comycete, and the Alga involved is nearly always a unicellular form of the Green Algae or some form of the Blue-green Algae. The Fungus is a parasite on the Alga, obtaining food from the Alga
. Botany for agricultural students . Botany. 380 THALLOPHYTES or they may have slender branching bodies Hke the one shown in Figure 334. The slender branches may be erect, prostrate, or hang in festoons from the branches of trees or other sup- ports. A Lichen, although regarded as a plant, is a structure formed by the association of a Fungus and an Alga. The Fungus in- volved is in nearly all cases an As- comycete, and the Alga involved is nearly always a unicellular form of the Green Algae or some form of the Blue-green Algae. The Fungus is a parasite on the Alga, obtaining food from the Alga. The hyphae of the Fungus get food from the Alga by being in close contact, and since the cells of the Alga are rarely pene- trated, the Alga apparently is not A section through a Lichen, as shown in. Fig. 332. — Lichens on an Apple branch. From Bulletin 185, Maine Agr. Exp. Sta. injured in most cases. Figure 335, shows a mcshwork of hyphae and in the meshes the cells of the Alga are held. Usually the hy- phae are more closely interwoven in the outer region, thus forming a compact cortical region which encloses the looser region within where the cells of the Alga are usually more abundant. On the under surface filamen-. 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 Martin, John N. (John Nathan), b. 1875. New York : John Wiley & Sons, Inc.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
