. Botany for high schools and colleges. Botany. 308 BOTANY. to completely evaporate before placing in the moist chamber. By tab- infr precautions to keep out moulds, by supplying the moist chamber with air passed through one or two plucrs of cotton-wool, he succeeded in continuing the orrowth of the hypb* for three mouths, at the end of which time the algae were surrounded by a good number of branches. Fig. 212. Fia. 213. Fie. 212.—Usneabarbnfa, nat. size, a, a, apothecia ; /, disk by which it is attached to the bark of a tree.—After Sachs. Fig 2\ pulmonacea, nat. size, a, a, apotheci
. Botany for high schools and colleges. Botany. 308 BOTANY. to completely evaporate before placing in the moist chamber. By tab- infr precautions to keep out moulds, by supplying the moist chamber with air passed through one or two plucrs of cotton-wool, he succeeded in continuing the orrowth of the hypb* for three mouths, at the end of which time the algae were surrounded by a good number of branches. Fig. 212. Fia. 213. Fie. 212.—Usneabarbnfa, nat. size, a, a, apothecia ; /, disk by which it is attached to the bark of a tree.—After Sachs. Fig 2\ pulmonacea, nat. size, a, a, apothecia.—After Sachs. of the hypliae, many of which had firmly attached themselves to the cells of the algse. (c) The classification of lichens is by no means settled. The arrangement which is followed in this country is that of Profes- sor Tuckerman.* He divides the order into five tribes, as follows: Tribe I. Parmeliacei. Apothecia rounded, open, scutelliform, contained in a thalline exciple. Family 1. TJsneei. Roccella, Ramalina, Dactylina, Cetraria, Emr- nia, Usnea (Fig. 212), Alec'ona. BocceUa Hndoria and other species cv the genus furnish the dye known as orchil, and chemical test "litmus. Cetraria islandiea, the Iceland moss, is used both as a food and a medi- * Edw. Tuckerman : " Genera Lichenum ; An Arrangement of North American Lichens," 1872, and " Synopsis of N. A Licliens," 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 Bessey, Charles Edwin, 1845- [from old catalog]. New York, H. Holt and company
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