Phytogeographical Excursion in the British Isles. 277 
Stratiotes Aloides is also remarkable, occupying a large extent of 
Barton Broad. These aquatic associations are rapidly filling up 
the broads, which are, however, kept partially clear by cutting. 
Heron’s Carr, a very finely developed swamp carr to the south-west 
of Barton Broad was next visited. It contains very finely developed 
ferns, Osmunda regalis, Athyrium Filix-fcemina, etc.: the abundance 
of Iris Pseudacorus (which does not flower) is also characteristic, 
and species of Ribes are abundant. Fen carr was observed in 
process of forming on the outskirts of Heron’s Carr. The fen 
itself is of the Bure valley type and societies of Sphagnum and 
Drosera intermedia occur here and there. 
Owing to the kindness of Mr. Robert Gurney some of the party 
were accommodated at his laboratory on Sutton Broad, and the 
whole party were entertained to tea there by Mrs. Gurney and 
himself. Mr. Gurney also generously offered to put the whole 
party up at his laboratory, house, and cottages, but it was not 
necessary to trespass on his kindness so far, as accommodation was 
available in Sutton village. 
On the morning of August 5th the party travelled to Potter 
Heigham on the Thurne and inspected a small development of 
“Hochmoor” with Sphagnum, Polytrichum commune, Eriophorum 
angustifolium, Calluna vulgaris, Erica Tetralix, Drosera rotundifolia, 
etc. on the edge of the fen. The party afterwards embarked on a 
motor-launch at Heigham Bridge and ascended the River Thurne, 
turning up Candle Dyke to Heigham Sound, with its fine marginal 
reedswamps dominated by Typha angustifolia, and Hickling Broad. 
Naias marina was gathered from its only recorded locality in the 
British Isles, and then the launch proceeded up the Meadow Dyke 
to Horsey Mere, stopping on the way to visit Blackfleet Broad, 
now a small patch of water almost isolated in the fen. The fen 
surrounding this broad interested the party considerably. It is of 
brackish type with GLnanthe Lacheualii, etc. Lastrea cristata 
occurs here as well as societies of Sphagnum on tussocks of 
Phragmites. In Horsey Mere itself Lychnothamnus stelliger was 
gathered. The water of the whole of this series of broads is more 
or less brackish, and has an interesting plankton very poor in 
species but containing some marine or brackish water Diatoms, 
while such plants as Cochlearia officinalis, Plantago maritima, 
Scirpus maritimus and Triglochin maritimum are scattered through 
the district. After leaving Heigham Sound the launch proceeded 
down the Thurne into the Bure and up as far as Horning. 
Opposite the Church the party disembarked to inspect typical Bure 
Valley fen and well developed fen carr. Then the launch continued 
to Woodbastwick Old Hall, where Mrs. Barclay entertained the 
party to tea. Hoveton Great Broad was then visited in boats in 
company with Mrs. Barclay, and an attempt was made to enter a 
small broad connected with the Great Broad where swamp carr is 
very finely developed in connexion with tussock swamp of Carex 
paniculata and C. acutiformis, but owing to the shallowness of the 
water and to the fact that very little time was available the attempt 
had to be abandoned. The launch then continued to Wroxham, 
past the abundant carrs developed on the fenland of this region of 
the Bure valley. The train was then taken to Cromer, and after 
supper, the party proceeded to Holt, where the night was spent. 
