MARINE ALG OF BEAUFORT, N. C. 393 
In February we find the last reduced plants of Codium tomentosum (C. decorticatum 
having disappeared earlier) and of Chondria dasyphylla. From this time the flora 
consists entirely of perennial and spring species. Porphyra has attained a large size; 
Enteromorpha linza has appeared; and Enteromorpha prolifera, Ectocarpus confervoides, 
Petalonia, Porphyra, Agardhiella, Gracilaria multipartita, and Grinnellia are the principal 
species composing the flora. 
In March, the alge are scarcer than at any other time during the year, but the 
perennial and spring species already mentioned are present without change, except that 
small plants of Leathesia have made their appearance. 
During April the spring flora attains its greatest development. The dominant form 
throughout the harbor and along all the shores is Ulva lactuca, which occurs on all rocks 
and forms large masses lying free on the bottom. Closely rivalling this are Entero- 
morpha prolifera and Porphyra growing on all rocks and posts throughout the harbor. 
These three species are extremely abundant everywhere, but in limited areas they are 
surpassed by Polysiphonia nigrescens and Ceramium strictum. ‘The species occurring 
here at this time may be grouped as follows: 
ABUNDANT. Polysiphonia nigrescens. 
Dasya pedicellata. 
Lyngbya confervoides. Ceramium strictum. . 
Enteromorpha linza. 
Enteromorpha prolifera. OCCURRENCE LIMITED. 
Ulva lactuca. 
Ectocarpus confervoides. Enteromorpha flextosa. 
Petalonia fascia. Enteromorpha intestinalis. 
Myrionema strangulans. Chzetomorpha melagonium f. rupincola. 
Leathesia difformis. Rhizoclonium riparium. 
Fucus vesiculosus. Cladophora flexuosa. 
Porphyra leucosticta. Bryopsis plumosa. 
Acrochetium virgatulum. Ectocarpus siliculosus. 
Gelidium ccerulescens. Stilophora rhizodes. 
Agardhieila tenera. Sargassum filipendula. 
Gracilaria multipartita. Bangia fusco-purpurea. 
Champia parvula. Acrochetium corymbiferum. 
Lomentaria uncinata. Gelidium crinale. 
Grinnellia americana. Gymmnogongrus griffithsiz. 
Chondria tenuissima var. baileyana. Hypnea musciformis. 
Young plants of several species were observed at this time. Several specimens of 
Codium 3 to 12 mm. tall were found on shells in the clearer, deeper water north of the 
laboratory. Fucus showed, in addition to the large plants, many germlings 2 to 3 mm. 
tall. Small plants of Chondria dasyphylla also were observed. 
Besides the germlings of Fucus, many large plants up to 14 cm. tall were present. 
These were entirely without fruit. Ulva, Enteromorpha prolifera, Lomentaria, and 
Champia grew more abundantly and to a larger size than in summer. Fruiting plants 
of Hypnea 1 to 6 cm. tall were observed, all of these being tetrasporic. 
During May the spring species begin to disappear, some of the plants showing signs 
of disintegration. Enteromorpha linza, E. prolifera, Chetomorpha melagonium jf. rupin- 
cola, Stilophora, Bangia, Porphyra, Dasya, Polysiphonia nigrescens, Grinnellia, and 
Ceramium are, however, still present. Hypnea has now attained its summer condition, 
