332 DR. SARAH M. BAKER AND MISS M. H. BOHLING ON 
2. The Hurst Castle Fuci. 
The Fucus vegetation which accompanies Spartina Townsendii on the 
Hurst Castle marshes is very luxuriant and, in places, extensive. Plants 
of all sizes are found, forming a series similar to the Blackwater series (see 
Cotton in Morris, 1914, р. 192), in which many of the intermediates bear 
vesicles. In June 1914, one of us collected thirteen receptacles from the 
larger plants in this locality, and they were found to be all female, with 
undivided oospheres and nonprojecting paraphyses. The Hurst Castle Fuci 
Fig, 83. — Fucus vesiculosus megecad limicola ecad volubilis. Nat. size. 
Intermediate form. A, without vesicles: B, with vesicle. Blackwater Marshes, Essex. 
are analogous in habit to the Blackwater Fuci, but their branching is more 
luxuriant and fastigiate. On account of their moncecious receptacles and the 
frequent presence of vesicles, they are also referable to Fucus vesiculosus, L. 
3. The Blakeney Fuci. 
At Blakeney there are two distinct forms of Fucus, with no intermediates. 
The larger is spirally twisted and occurs with Aster Tripolium, L., on the lower 
levels of the marsh ; it is referable, morphologically, to the intermediate 
forms of the Blackwater series, except that its receptacles are pointed and 
commonly filled with air, instead of ovoid and mucilaginous. But it is a 
peculiarity of the Blakeney area that no plant has yet been found bearing 
the characteristic vesicles quite common in plants of a similar habit in the 
Blackwater series. The same applies to the Fucus found by Turner (1802, 
