302 Yorkshire Naturalists at Driffield. 
palustris and Carex paradoxa which, however, were known in 
stations in similar ground below Driffield, towards Wansford. 
There was a large growth of the sedges—chiefly Carex paniculata 
and the grasses Phalaris arundinacea and Poa aquatica. In 
connection with the last, Dr. Woodhead initiated an interesting 
discussion on the ‘ tussock’ formation that is such a marked 
feature of the damp ground near King’s Mill. The origin of 
the ‘ tussocks ’ was to some extent elucidated later in the day 
by investigations made in a wet, shallow gravel-pit of not 
more than ten year’s excavation, near to Kelleythorpe, whither 
we proceeded after visiting the King’s Mill Marsh. Here there 
was a wonderful growth of Carex flava, in specimens and tufts 
of the maximum size, occasionally intermingled with the sedges 
C. Goodenovit, C. glauca and C. paradoxa (another new station). 
As one trod upon the wet, gravelly floor of the pit, and ever and 
anon, upon one of the already fairly large ‘ tussocks ’ of Carex 
flava, it seemed evident that the sedges do pioneer work in 
“tussock ’-building, the grasses and others coming in later as 
accessories. On dry ground at the edge of the pit the adder’s 
tongue fern grows in abundance, many plants being found 
bearing aloft the characteristic sporiferous frond. 
The swamp, and the wood on the part of the same, near 
Kelleythorpe, are very wet notwithstanding the two or three 
ditch-like streams of very clear water by which they are 
intersected. This proved a rich and interesting bit of ground, 
for upon it grew a wealth of species in great luxuriance. In 
flower were Thalictrum flavum, Ranunculus Lingua, Myosotis 
palustris, Pedicularis palustris, Iris pseudacorus, etc. 
In the wet wood there was profusion of Cavex paniculata, 
again forming huge ‘ tussocks,’ whilst Juncus acutiflorus was 
sparingly present and Schenus nigricans considerably less 
so. But the remarkable sight was the luxuriant, almost 
rampant, growth of the Marsh Buckler fern— Lastrea Thelypterts. 
Leaving the Kelleythorpe habitat of plants beloved by the 
botanist we crossed the railway and made wa fields to Sunder- 
landwick, ten minutes from Driffield. 
it had not been a very long round—three or four miles 
in all—but the remark made in the circular programme of the 
meeting that near Driffield one finds some of the best botanical 
ground in the vice-County (East Riding) had ample confirma- 
tion. 
BryoLtocy.—Mr. C. A. Cheetham writes :— 
The mosses were few and of a common type, the first noted 
was a fine growth of Eurhynchium rusciforme by the siuice 
gates, with Physcomitrium pyriforme and Webera carnea on 
the river banks. Amongst the grass in the damp meadows at 
King’s Mill Hypnum cuspidatum with Climacium dendroides are 
to be seen in plenty and where water usually stands Hypnum 
Naturalist, 
