. Practical botany. Botany. THE LK'HEXS stones; while fruticose fnnns grow upmi the, ground or liung fr(jiu bnuiclies of trees. Illustrations of tin' latter group ai-e the reindeer moss {^VhiJ<Dii(i i-iuiij/fcrini/) and other cladonias (Fig. li-to), and the bearded moss (^Lhnvii bdrlmiti'). In sections or carefully made dissections of a lichen body usually the fungus is seen to compose the outer covering for the whole bod)-. The alg:e are A\'ithin, and often closely wound about by the hypliie of the fungi (Fig. 194), ^^'hieh absorb food from the cells of the algae. The fruiting cups usu- al
. Practical botany. Botany. THE LK'HEXS stones; while fruticose fnnns grow upmi the, ground or liung fr(jiu bnuiclies of trees. Illustrations of tin' latter group ai-e the reindeer moss {^VhiJ<Dii(i i-iuiij/fcrini/) and other cladonias (Fig. li-to), and the bearded moss (^Lhnvii bdrlmiti'). In sections or carefully made dissections of a lichen body usually the fungus is seen to compose the outer covering for the whole bod)-. The alg:e are A\'ithin, and often closely wound about by the hypliie of the fungi (Fig. 194), ^^'hieh absorb food from the cells of the algae. The fruiting cups usu- ally resemble some of those of the aseomycetes. AVithin tlie base of the cup in most lichens the fungal liyphaa form asci and aseospores, as do many aseomycetes. These spoi'i's belong to the fungus. The algal part of the lichen when it is a one-celled alga like Plcuroi-occuH reproduces hj division, as aa'c have al- ready found that it does in the green algae. This repro- duction of the alga occurs quite independently of the reproduction of the fungus. 229. Economic importance of lichens. Probably the greatest economic importance of lichens is found in their relation to formatiim of soils. Any freshly bared rock soon becomes the. 1'.12. X detail of a small piece of Usnca barbata The braDC'lies bear the fruiting cups, and branches may also grow from the cups. The open sides of the cups are shown in 6, and the reverse surfaces in c. 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 Bergen, Joseph Y. (Joseph Young), 1851-1917; Caldwell, Otis William, 1869- joint author. Boston, New York [etc. ] Ginn and company
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisher, booksubjectbotany
