MK. W. A. NICHOLSON ON BOTANY OF SUTTON. 267 
of wet common approaches more nearly to the true meadow, 
with its regular grass carpet. The carpet-formation of the 
marshes, where one exists, is mainly a moss-carpet. Kerner’s 
definition of carpet is “ low, perennial plants which form 
a close mat covering the ground.” The grass-carpet would 
necessarily be found in drier situations. A near approach to 
a carpet is formed by the Marsh-cinquefoil ( Potentilla palustris, 
Scop.), which overspreads considerable portions of the 
marshes. 
In the main I have followed the nomenclature of the species 
in the 9th edition of the London Catalogue, 1895, though 
without adhering in all cases to the arrangement of that 
Catalogue. In the examination of the plant-associations of 
a district, one is not so much concerned with systematic 
arrangement of the plants, as with their relative abundance 
in particular positions. 
Mr. A. Bennett, F.L.S., has kindly examined and confirmed 
the Lists of Characeae and Potamogetons, quoted, and Mr. 
W. H. Burrell has furnished a list of Mosses and Hepatica*, 
with some remarks upon them, which lie has kindly allowed 
me to incorporate in this paper. I am also indebted to Miss 
A. M. Geldart for several suggestions. 
The Characeee are well represented in the Broad district. 
In the immediate neighbourhood of the Sutton Laboratory, 
six species, at least, have been found. These, which were 
growing in rather shallow water, were 
Chara fragilis, Desv. 
C. aspera, Willd. 
C. POLYACANTHA, Braun. 
C. HISPIDA, L. 
Lycnothamnus stelliger. Braun. 
Nitella opaca, Agardh. 
Another species of Nitella, viz., N. flexilis. Agardh, was 
found between Stalham staithe and Barton Broad, by Mr. 
A. Bennett. 
The occurrence of Lycnothamnus stelliger. Braun, here, is 
of special interest. It was first discovered in Britain at Filby 
and Potter Heigham by Mr. A. Bennett, and has since been 
VOI.. VIII. t 
