MARINE ALG OF BEAUFORT, N.C. 465 
filament, soon developing into a flat membrane consisting of one or two cell layers; 
propagation and reproduction as in Bangia; spore fruit consisting of eight or more cells. 
About 20 species, all marine, many of them not sharply separated. 
Porphyra leucosticta Thuret. 
Porphyra leucosticta, Thuret, in Le Jolis, 1863, p. 100. 
Porphyra atropurpurea, De Toni, 1897, p. 17. 
P. B.-A. No. 376. 
Frond shortly stipitate, attached by a basal disk, consisting of a single layer of cells (except during 
reproduction), variable in color from pink or red to purple and in form from indefinite sheets to narrow 
bands, simple or variously divided, 2 to 40 cm. long, 0.5 to 14 cm. wide; moneecious, antheridia forming 
small, elongated, colorless patches among the darker female organs. 
Temperate North Atlantic and Pacific; Mediterranean. 
Very abundant between tide lines throughout harbor and on jetties, Beaufort, N. C., January to 
May. 
At Beaufort the plants are kidney shaped to linear, lanceolate and laciniate, 3 to 10 cm. long, of a 
pinkish or brownish purple color. 
Another species, P. /aciniata (Lightf.) Ag. has not been observed in this region, but 
may be found here at times, although it is, in general, a more northern form than 
P. leucosticta. These species can not be separated by form or color, but are distinguished 
as follows: P. leucosticta, moncecious, antheridia occurring in small, elongated, colorless 
patches; P. Jaciniata, usually dicecious, antheridia forming a colorless marginal zone. 
Genus 3. Goniotrichum Kuetzing. 
Goniotrichum, Kuetzing, 1843, p. 244 (in part). 
Thallus erect, filamentous, consisting of a single row of cells, exhibiting ‘‘false 
branching,’ or, occasionally, laterally branched; cells rose colored, containing single, 
star-shaped chromatophores and single nuclei; cell walls soon becoming gelatinous} 
asexual propagation by transformation of vegetative cells into monosporangia, their 
contents soon escaping as naked monospores; sexual reproduction unknown. 
Two species recognized. 
The members of this genus are peculiar in combining characters of the blue-green 
and the red alge. In their possession of ‘‘false branching’’ and gelatinous sheaths 
formed by the swelling of the cell walls inclosing the filaments, they resemble the Myxo- 
phycez, while the structure of their cells, and especially their method of propagation, 
place them among the Bangiacez in the Rhodophycez. 
Goniotrichum alsidii (Zanardini) Howe. Fig. 23. 
Bangia alsidii, Zanardini, 1839, p. 136. 
Goniotrichum elegans, Zanardini, 1847, p. 254 (69). 
Goniotrichum elegans, Forti, in De Toni, 1907, p. 687. 
Gontotrichum elegans, Tilden, 1910, D. 295. 
Goniotrichum alsidii, Howe, 19148, D. 75. 
P. B.-A. No. 781. 
Filaments red, 1 to 5 mm. long, inclosed in gelatinous sheaths; cells cylindrical or elliptical, 7 to 
Io mic. wide, 11 to 20 mic. long; sheaths 2 to 6 mic. wide on each side of filament, often with crenate 
edges. 
Warm and temperate North Atlantic. 
Occasional on other alge and on eel grass (Zostera marina), usually occurring in very small quan- 
tities, abundant on one old specimen of Padina vickersig, Fort Macon jetty, December, 1908, and occa- 
sional on various alge dredged from coral reef offshore, Beaufort, N. C., August, 1914 and rors. 
