THE plant which is the subject of Dr. S. Williams's interesting note, under the above title, in Nature of May 14, p. 769, is almost certainly Cryptothallus mirabilis v. Malmb. By a remarkable coincidence, on almost the same day as that on which this issue of Nature was received in the Library of this institution, there also reached us an issue of the Swedish periodical Botaniska Notiser (Lund), in which there appears an illustrated note on the occurrence of C. mirabilis in Sweden, Finland and (probably) Austria. The author, H. Sjors, of the Institute of Plant Biology, University of Uppsala, summarizes the known occurrences of this hepatic, comments on its ecological associates, and gives a useful list of literature references, the more important and more accessible of which are here reproduced for the convenience of those who may not have easy access to the Botaniska Notiser.