MARINE ALGA! OF BEAUFORT, N. C. 521 
1. Grateloupia filicina (Wulfen) Agardh. Pl. CXIII, fig. 1. 
Fucus filicinus, Wulfen, 1789, p. 157, pl. 15, f. 2. 
Grateloupia filicina, Agardh, 1822, p. 223. 
Grateloupia filicina, Harvey, 1853, p. 200. 
Grateloupia filicina, De Toni, 1905, p. 1563. 
P. B.-A. Nos. 394, 1449. 
Frond flattened, 4 to 45 cm. tall, 0.5 to 2.5 mm. wide, branching decompound-pinnate, sometimes 
irregular, sometimes bearing proliferations from the flat surfaces, main axes and pinnz tapering toward 
the base and apices, linear; pinnz about o.3 to 2 mm. wide, lower ones usually longer and pinnulate, 
upper ones shorter and rather simple; tetrasporangia immersed in the pinnules, inconspicuous, some- 
times clustered; cystocarps immersed in the pinne, numerous, clustered, inconspicuous; texture tough- 
membranaceous; color straw pink to reddish or greenish purple. 
Warm and temperate waters generally. 
One group on Fort Macon jetty, Beaufort, N. C., August, 1906, and July, 1908, 10 to 20 em. below 
low water, some tetrasporic. 
This species varies considerably in habit, ranging from one main axis with regularly distichous 
branches from the margins to many axes about equally prominent giving off branches about equal to 
the main axes; the branching is frequent or infrequent and sometimes is very irregular, with numerous 
small branches; the main axes are more or less flattened, sometimes being almost terete. In spite of 
its variability, it is not apt to be mistaken for any other species occurring within our range. 
This is the northern known limit of the species and of the genus on our coast. 
2. Grateloupia gibbesii Harvey. Pl. CXIII, fig. 2. 
Grateloupia gibbesii, Harvey, 1853, p. 199, pl. 26. 
Grateloupia gibbesii, De Toni, 1905, p. 1566. 
Frond flattened, 6 to 60 cm. tall, o.5 to 4 cm. wide, rather simple or irregularly divided, finally 
pinnate from the margins, sometimes bearing numerous proliferations from the flat surfaces, main axis 
and pinne tapering toward each end, pinne more or less elongated, narrow, linear-lanceolate, often 
bearing numerous small, narrow pinnules; cystocarps minute, densely scattered through the lobes, 
embedded in the cortical layer; texture fleshy-membranaceous; color blackish purple, changing to 
greenish purple. 
Abundant on jetty directly exposed to sea, Charleston, S. C., from tops of rocks washed by waves 
to 15 cm. below low water, Morris Island, July, 1909. 
This species is extremely various in habit, the fronds being simple or much divided in irregular 
ways; the margins and surfaces may be smooth or densely covered with proliferations. In spite of its 
variation, the species is easily recognized. It isnot known beyond Charleston and vicinity. 
Genus 3. Cryptonemia J. Agardh. 
Cryptonemia, J. Agardh, 1842, p. 100. 
Frond flat, stipitate, usually provided with a midrib often becoming less conspicuous 
toward the apices, simple or dichotomous or proliferous from the midrib or margin; 
structure fairly dense, medullary portion consisting of elongated, segmented, branched, 
densely interwoven filaments, cortex dense, coniposed of one or a few layers of large, 
rounded cells within, small cells without, disposed without definite order; tetrasporangia 
embedded among the cortical cells, occurring in locally thickened nemathecia borne on 
special, smaller, usually terminal shoots; cystocarps small, inconspicuous, usually borne 
on smaller, terminal portions of the thallus, either on special segments or scattered over 
the surface, communicating with the exterior by a pore, bearing numerous minute car- 
pospores without regular order in a rounded mass suspended from the medullary fila- 
ments. 
About 10 species, in warm seas. 
