THALLOPHYTES

The Thallophytes, while of very great botanical interest, comprise about 100,000 species, yet relatively few are of any economic importance. The Algae are chiefly used because of the mucilagethat they contain and as a source of iodin. A number of lichens contain important coloring matters. A few of the fungi are used in medicine, although a great number of them contain exceedingly toxic principles."

Soure: Scientific and applied pharmagognosy by Henry Kraemer, New York, John Wiley & Sons, Inc. London: Chapman & Hall, Limited 1920