MARINE ALG OF BEAUFORT, N. C. 495 
Beaufort, N. C.: Occasional on Bogue Beach, February to September, probably throughout the 
year, often fairly abundant after storms, especially during summer and autumn; several small masses, 
Fort Macon jetty, July and August, 1906, and one plant September, 1907, 5 to 30 cm. below low tide; 
few plants on coral reef offshore, 24 to 25.5 m. below surface, May, 1907. 
This species seems to belong to the subgenus Cryptoneura J. Ag. In respects other than the arrange- . 
ment of the sori it closely resembles N. laceratum Grev. ‘The structure of these species is so similar that 
it would seem to indicate a relationship, but the sori are not confined to the margin or marginal prolifera- 
tions as in N. laceratum and other species of the tribe Botryoglossopsis (J. Ag.) De Toni. In many 
respects NV. medium resembles species of the tribe Dawsoniz (Bory) J. Ag. Although the sori are some- 
what irregularly arranged and usually are not conspicuously radiating toward the margins, they are not 
more irregular than in some species of that tribe. The veins are, however, narrower and the margins 
thicker than in the species under Dawsoniz which have been available to the author, and the present 
species does not seem to agree closely with any of the sections under that tribe. If it should be placed 
under Dawsoniz, it perhaps agrees best with the section Supradecomposite J. Ag., although the frond is 
usually more regularly dichotomous than in species of that section available to the author. Its position 
in the subgenus must, therefore, be left in doubt pending more extended comparisons. 
No specimens have been found by the author except at Beaufort, but several unnamed specimens 
from points south of this place observed in American herbaria seem to belong to this species. One of 
these in the herbarium of the New York Botanical Garden is labeled “‘ Delesseria? L. I. G. Pawley’s I, 
July or Aug. 1875.’’ The present known distribution of the species may, therefore, be given as from 
Beaufort, N. C., to Pawleys Island, near Georgetown, S. C. 
The type (Pl. CV, fig. 2) is a tetrasporic plant collected on Bogue Beach, Beaufort, N. C., July 12, 
1907. This has a longer stipe than is usually found, but in other respects is a fair average of the species. 
In other specimens the veins are sometimes more, sometimes less, conspicuous, the sori are sometimes 
larger and more clustered toward the apices, and sometimes (Pl. CV, fig. 3) more nearly in regular rows, 
while sometimes the branching is a little more irregular. The type, with several cotypes and other 
specimens, together with slides used in the study of the species, have been placed in the U. S. National 
Herbarium. 
Genus 2. Grinnellia Harvey. 
Grinnellia, Harvey, 1853, D. 91. 
Frond flat, thin-membranaceous, bore on a short stalk, usually simple, sometimes 
irregularly branched, traversed by a midrib which is conspicuous below, becoming less 
conspicuous near the apex, sometimes with lateral nerves arising pinnately from the 
midrib barely visible to the naked eye; composed of a single layer of cells over most of 
the frond, at the midrib of several layers of cells, cells irregularly angular in surface view, 
squarish or oblong in section; apical cell evident in the young frond, soon disappearing, 
the growth of the adult frond being intercalary; tetrasporangia triangularly divided 
occurring in sori forming small, rather indefinite thickenings scattered over the frond; 
antheridia borne at the ends of short filaments arising in clusters from the thallus cells 
on both sides of the frond; cystocarps scattered over the frond, sessile, hemispherical, 
rather prominent, pericarp thin, opening by a conspicuous apical pore, joined to the basal 
placenta by thin, filamentous, sterile strands, gonimoblast composed of rather loose, 
dichotomously branched filaments which form carpospores from nearly all their cells. 
One species, New England to West Indies. 
Grinnellia americana (Agardh) Harvey. PI. CVI, fig. 1. 
Delesseria americana, Agardh, 1820, p. 173. 
Grinnellia americana, Harvey, 1853, Pp. 92, pl. 21 B. 
Grinnellia americana, Farlow, 1882, p. 161, pl. 13, f. 2-4. 
Grinnellia americana, De Toni, 1900, p. 723. 
A. A. B. Ex. Nos. 64a, 64b. 
P. B.-A, Nos. 593, Fasc. A, No. XXII. 
