DICTYOTA 71 
australis (Sond.) Kuntze, N. Muelleri (Sond.) Kuntze, and N. 
membranaceus (Stack.) Kuntze, but it perhaps deserves comparison 
with the medium-sized Californian N. zonarioides (Farlow)* 
rather than with any of the others named. Besides being 2-4 
times as large in its general gross dimensions as the largest speci- 
mens of N. zonarioides that we have seen, the surface cells of the 
usually more delicate lamina of N. Cokeri have diameters 2-3 
times as great, the lamina is remarkably destitute of hairs, and 
there are often considerable areas along the margins that are only 
I or 2 cells thick, a character that we have not observed in N. 
zonarioides, in which, also, we have not noted marginal innovations. 
In the laciniate-incised character of lamina in the mature plants 
there is a certain degree of similarity between the two species, 
yet this peculiarity appears to belong more exclusively to the 
apical portions in N. Cokeri than in N. zonarioides. 1115 probable 
that the color of N. Cokeri is lighter or greener than that of the 
Californian species, but of this, from the nature of the material, 
we are hardly able to judge. 
PLATE 13, FIGURES 5-9.  Neurocarpus Сокет 
5. A portion of the surface of the thallus, showing oogonia and outlines of the surface 
cells. . 
6. Outlines of the cells of the purae o of lamina near base of plant. 
9. A cross зеснов паара the usual structure of the margin of the па. 
8. А cross сї ing а unistratose E in a rather young € of the thallus. 
9. 4 unistratose margin near the base he plant, in surface view. 
Figures 5 and 6 are enlarged 68 ante 7-9, 245 diameters. 
PLATE 22. Neurocarpus Сокет 
Photograph of the dried type specimen (Coker 170), about two fifths of the 
natural dimensions. 
DICTYOTA Lamour. Nouv. Bull. Sci. Soc. Philom. т: 331. 
My 1809; Jour. de Bot. 2: 38. 1809. J. Ag. 
Till Alg. Syst 2: 83. 1880; Anal. Alg. 
Cont. 1: 45. 1894 
DICTYOTA DICHOTOMA (Huds.) Lamour. Jour. de Bot. 2: 42. 
Ulva dichotoma Huds. Fl. Angl. 476. 1762. 
“From an estero (salt creek) known as Rio Zarumilla, near 
* Comb. nov. (Dictyopteris zonarioides Farlow, Erythea 7: 13. 1800.) 
