106 THE JOURNAL OF BOTANY 
growing form of Marchantia polymorpha L., occurring at Netherton, 
near Liverpool (South: Lancs), was probably the var. aquatica of 
authors, t year Mr. Macvicar, to whom I sent specimens, 
informed me that he had been able to obtain confirmation of the 
varietal name, and that it could be added to the British list as var. 
aquatica Nees. The locality at Netherton isa piece of apparently ab- 
ear Rain 
in many other localities in which suitable conditions obtain. Both 
sexes occur, but male plants are much more plentiful than female 
ones.—J. A. ON. 
NOTICES OF BOOKS. 
Morphologie und Biologie der Algen. Von Dr. Frrepricu OLTMANNS. 
. i, 443. Illustrated. Jena: Fischer. 1905. 
Price 12 marks 
more actively followed, and any leeway there may have been is 
being quickly made up. 
Hitherto no satisfactory general treatise on Alge, embodying the 
results of their modern study in all its aspects, has appeared, 
though several attempts have been made. Even the treatment 
of the Alge in Engler & Prantl’s Natiirliche Pflanzenfumilien was 
disappointing ; for this some explanation is to be found in the fact 
that the work as it stands shows plainly the effect of joint author- 
