May 1907.] | BOTANICAL SOCIETY OF EDINBURGH. 279 
MEETING OF THE SOCIRTY, 
May 9, 1907. 
Professor BayLEY Batrour, F.R.S., in the Chair. 
The following communications were read :— 
NotTE oN Warty DISEASE OF THE POTATO. 
By Dr. A. W. BorrHwicx. 
Dr. BortHwick exhibited potato tubers which had been 
attacked by the black scab fungus, Chrysophlyctis endobiotica. 
This disease made its first appearance in England only a very 
few years ago, the outbreak occurring in Cheshire. It was also 
reported from North Wales, and has now evidently reached 
Scotland. A full account of the outbreak will be found in 
“ Notes from the Royal Botanic Garden, Edinburgh,” No. xvii. 
pp. 115-119, t. 23. 
NOTE ON PETALOPHYLLUM RALFSIIT AND PALLAVICINIA 
HIBERNICA. By BERTRAM CocKBuRN, Ph.C. Communicated 
by Mr. J. RurHerrorp HILt. 
These two Hepatics grow in damp, sandy, grassy hollows or 
salt marshes near the sea, but not touched by the tide. 
They often grow together, but are quite distinct. Petalo- 
phyllum Ralfsii is very rare, and easily overlooked. It was 
first distinguished by Wilson, who gathered it in Anglesey 
in 1830. He gave it the name Jungermania Ralfsiz, following 
Hooker in his generic nomenclature. The name Petalophyllum 
was given by Gottsche. Ralfs gathered the plant at Hayle, 
Cornwall, in 1842, and it has been gathered by Holmes at 
Redcar, and at Airsdale Sands, near Southport. It has also 
been gathered on the Irish coast by Dr. Moore. The localities 
for Pallavicinia hibernica are practically the same. It has also 
been reported from Fifeshire and Forfarshire. The name 
Pallameinia was first given by Gray and Bennett in 1821. 
In Pearson’s “ Hepatice of the British Isles ” there are three 
