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These rocks are of granite passing into gneiss. At the confluence of the Vichada the rocks of granite, and what is still more remarkable, the soil itself, are covered with moss and lichens. These latter resemble the Cladonia pyxidata and the Lichen rangiferinus, so common in the north of Europe.
In the Marchantia polymorpha some yellow wool proceeds from the flower-bearing anthers, which moves spontaneously in the anther, while it drops its dust like atoms. Murray, Syst. Veg. See note on Collinfonia for other instances of vegetable spontaneity. Corallinus, or lichen rangiferinus. Coral-moss. Clandestine-marriage.
The cladonias appeared to me to be identical with the Lichen rangiferinus, the L. pixidatus, and the L. polymorphus of Linnaeus. After having passed the rapids of Guarinuma, the Indians showed us in the middle of the forest, on our right, the ruins of the mission of Mendaxari, which has been long abandoned.
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