. Nature-study; a manual for teachers and students. Nature study. 392 NATURE-STUDY Another interesting flowcrless plant, of which there are many forms, is the Lichen. These are usually flattened plants growing upon trees, rocks, earth, and cliffs. Gener- ally they are of a bluish-green color, but often they are yel- low, red, and black. Many form an irregular crust; others arc much branched and dissected. Some forms present a tufted or thread- like structure. Visit a pile of cordwood and note how many kinds of lichens may be found on the bark. Note that cer- tain species are found only on cert
. Nature-study; a manual for teachers and students. Nature study. 392 NATURE-STUDY Another interesting flowcrless plant, of which there are many forms, is the Lichen. These are usually flattened plants growing upon trees, rocks, earth, and cliffs. Gener- ally they are of a bluish-green color, but often they are yel- low, red, and black. Many form an irregular crust; others arc much branched and dissected. Some forms present a tufted or thread- like structure. Visit a pile of cordwood and note how many kinds of lichens may be found on the bark. Note that cer- tain species are found only on certain kinds of trees. A visit to a forest or to a boulder field will show many other kinds of lichens. The faces of old weathered cliffs are often cov- ered with them. There is a great class of flowerless plants called Fungi. A fungus has no chlorophyll, and therefore cannot make its own food (starch), and derives it from the living or dead tissues of other plants, or from animals. The most conspicuous fungi are mushrooms, or toad- stools, and puff-balls. It is well that pupils should learn a little of the general structure and habits of these peculiar plants. We speak of mushrooms growing in a single nighty but in reality where mushrooms appear thus suddenly there. Fig. i68 Agaricus Campestris. ( CuiiiruuLi Tiiiislirnimi 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 Holtz, Frederick Leopold, 1870-. New York, C. Scribner's Sons
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