- T mmm Cy ETAL 
R. J. HARVEY-GIBSON AND M. KNIGHT —REPORT ON THE ALGÆ. 309 
*16. LITHOPHYLLUM EXPANSUM, Phil. 
*47. LITHOPHYLLUM CRISPATUM, Hauck. 
*18. JANIA RUBENS, Lamour. 
The collection also included fragments of Marine Phanerogams, more 
especially Salicornia fruticosa, Linn., Cymodocea nodosa, Asch., and Halophila 
stipulacea, Asch. 
Fig. 4. 
a 
Longitudinal section of stichidium 
of Hypnea Valentie. 
Stages in the development of a vegetative 
bud of Hypnea Valentie. 
[Since writing the above paper we have noticed an article in the Bot. 
Gazette, Aug. 1912, by G. B. Rigg and A. D. Dalgity, in which similar 
phenomena are discussed in connection with another species of Polysiphonia, 
viz., Pterosiphonia bipinnata. The authors indicate their intention of con- 
tinuing the study of this plant from a cytological point of view. We still 
iniend, however, to continue the research indicated above, as it may be of 
interest to compare the cytological conditions underlying this phenomenon 
in plants gathered from both western and eastern shores of the Atlantic.— 
R. J. H.-G. & M. K., 7th January, 1913.] 
