147
NEW PLANTS RECORDED BY W. A. DUTT POLYPODIACEAE.
Thelypteris palustris Schott—Oulton, 1897. Dryopteris spinulosa (Mull.), Watt.—Somerleyton, 1898. Asplenium ruta-muraria L.—Lowestoft Church, 1898. OPHIOGLOSSACEAE.
Botrychium lunaria (L.), Sw.—Lowestoft, 1898. Ophioglossumvulgatum L.—Oulton marshes, 1897. 1909, W. G. Clarke.
Herringfleet,
MARSILEACEAE.
Pilularia globulifera
L.—Flixton, 1898.
REFERENCES.
Bentham, G . , and Hooker, Sir J . D . — " Handbook of the British F l o r a . " Butcher, R . W . , and Strudwick, F . E . , 1 9 4 4 — " F u r t h e r Illustrations o f British P l a n t s . " Clapham, A . R., 1 9 4 6 — " Check List of British Vascular Plants," '* Journal of E c o l o g y , " vol. 33, N o . 2, pp. 308 - 347. Clapham, A. R . , T u t i n , T . G . , and Warburg, E . F . , 1 9 5 2 — " Flora of t h e British Isles." Druce, G . C., 1 9 3 0 — Hayward's Botanist's Pocket-Book.
Hind, W . M . , and Babington, C., 1 8 8 9 — " T h e Flora of Suffolk." Index Kewensis—housed at the Royal Botanic Gardens, Kew. K e n t , D . H „ and Louslev, J . E . , 1951 - 5 3 — " A Hand List of the Planta of the London Area," parts I , I I and I I I ; Supplement to " T h e London Naturalist."
SALT TOLERANT FLORA ON THE SUFFOLK MARSHES THE great sea floods of January 31 st, 1953, inundated 16,000 acres of grassland and 4,4Ä0 acres of arable on the marsh levels in Suffolk. Over much of the area, it is now difficult to distinguish the grassland from the arable. Over a small area, the flood remained for a few hours or days, but over the greater part the water lay for a fortnight and in some places for five weeks. In consequence, winter sown crops were badly affected or destroyed and only the more salt tolerant grasses survived where the flood lay for about ten days. Since early June the marshes have produced an ever increasing crop of salt tolerant weeds. On higher well-drained positions, some perennial ryegrass has survived ; bents (Agrostis spp.) are found as isolated plants where the flood was prolonged. Barley grass has not only survived but exploited the opportunity of space.