112 
DICTYOTACEiE Stilophora. 
iv. 
occupying the whole superficies. The dentation of the margin is of the same 
nature as that of D. ciliata , but the teeth are very much closer and more irregular 
in form than in that species. 
YI. STILOPHORA. J. Ag. 
Root a small, naked dis . Frond cylindrical, branched, solid, or imperfectly 
tubular ; composed of two strata of cells, the inner stratum of many rows of 
colourless cells, of which those nearest the centre become ruptured in age, leaving 
a cavity traversing the frond ; the outer stratum o one or two rows of minute, 
coloured cells. Fructification, convex, wart-like sori , scattered over he branches, 
composed of obovate spores , nestling among moniliform, simple, densely packed 
paranemata. 
The frond is described by Agardli as being at first tubular, but gradually 
becoming soli 1 w’.th advanc ng age. The contrary of this structure has always 
appeared to me to be the case, the older parts being more empty than the 
younger. 
1. Stilopi-iora rhizodes, J. Ag. ; frond subsolid, much and irregularly branched, 
subdichotomous ; the apices scarcely attenuate, acute; ramuli scattered, forked; 
sori densely covering the branches and ramuli. J. Ag. Sp. Alg. vol. 1, p. 85. 
Harv. Pliyc. Brit. t. 70. Spermatochnus rliizodes , Kiitz. Sp. Alg. p. 549. (Tab. 
IX. B. . 
Hab. Near low-water mark, on other Algic in tide pools. Rare. Newhaven, 
Dr. Durkee. Greenport, Long Island, W. H. H. Oyster Bay, N. Y. Mr. Walters. 
(v. v.) 
Frond , in the American specimens, from four to five inches long, as thick as hog’s 
bristle, much branched, irregularly dichotomous, with rounded axils. Branches 
flexuous, variously divided, furnished with a few latera ramuli Inch are either 
simple or forked above their middle. The apices are acute, but not much tapered. 
The whole frond, in fertile specimens, is densely covered with he prominent, wart- 
like fructification ; each wart composed of a great many moniliform vertical fila- 
ments, packed together. Among these the obovate spores are found lying, being 
attached to the bases of the filaments. The colour is a greenish olive ; and the 
substance cartilaginous and elastic when fresh, ut soon becoming soft and gelatin- 
ous, and in drying the branches shrink considerably and adhere strongly to paper. 
