Books reviewed in this article:

Progress in Phytochemistry, Vol. 2. By L. Reinhold and Y. Liwschitz.

Investigation by Experiment. The Institute of Biology's Studies in Biology No. 23. By O. V. S. Heath.

Phytosociology and Ecology of Cryptogamic Epiphytes. By J. J. Barkman.

Les Lichens. By P. Ozenda and G. Clausade.

The Lichens of Israel. By M. Galun.

World Pollen Flora. Ed. by G. ERDTMAN. 4. Globulariaceae. By J. Praglowski and K. Gyllander.