392 



BULLETIN OF THE BUREAU OF FISHERIES. 



During the winter of 1908-9 monthly collections of all species observed were made 

 for the author from the time of his departure from the laboratory, October 20, 1908, 

 until his return, June 30, 1909. While more careful studies would probably alter the 

 present data in some details, these collections and those made by the author in May,* 

 1907, and April, 1908, give a fair picture of the seasonal distribution of the algae in the 

 harbor. 



The species occurring there in the summer may be grouped as follows: 



DOMINANT SPECIES. 



Lyngbya confervoides. 

 Codium decorticatum. 

 Codium tomentosum. 

 Sargassum ftlipendula. 

 Dictyota dichotoma. 

 Padina vickersise. 

 Gracilaria confervoides. 

 Gracilaria multipartita. 

 Hypnea musciformis. 

 Chondria dasyphylla. 

 Dermatolithon pustulatum. 



OCCURRENCE MORE LIMITED. 



Ulva lactuca. 

 Ulva fasciata. 

 Ectocarpus mitchellse. 

 Rosen vingea orientalis. 

 Fucus vesiculosus. 



Erythrocladia recondita. 

 Erythrotrichia carnea. 

 Goniotrichum alsidii. 

 Acrochaetitim dufourii. 

 Acrochaetitim hoytii . 

 Acrochaetium virgatulum. 

 Gelidium coerulescens. 

 Gelidium crinale. 

 Gymnogongrus griffithsiae. 

 Actinococcus aggregatus. 

 Agardhiella tenera. 

 Eucheuma gelidium. 

 Champia parvula. 

 Lomentaria uncinata. 

 Chondria sedifolia. 

 Herposiphonia tenella. 

 Polysiphonia harveyi. 

 Polysiphonia denudata. 

 Ceramium tenuissimum. 



The other species of the summer flora mentioned in Table i have been found only 

 occasionally. 



By the middle of October changes in the flora have become evident. Dictyota has 

 become relatively scarce, and Padina is less abundant than formerly, the plants of both 

 species being small and showing signs of degeneration; Chondria dasyphylla has almost 

 disappeared; Hypnea is still abundant and shows little change except that there seems 

 to be a greater preponderance of tetrasporic plants than formerly; Codium and Gra- 

 cilaria confervoides are still present; Ectocarpus is abundant and conspicuous; large 

 plants of Fucus are abundant and the fruits are well developed. 



During November this change continues. Dictyota becomes still scarcer and 

 finally disappears; Hypnea is reduced to small sterile plants, the condition in which it 

 passes the winter (PL CI, fig. 2) ; and the first of the spring flora, Petalonia fascia, makes 

 its appearance. 



In December we find the last plants of Padina and the species growing on this, 

 Erythrotrichia and Goniotrichum; Gracilaria confervoides has disappeared; Codium 

 tomentosum, Champia, and Chondria sedifolia are still present; Enter omorpha prolifera, 

 Agardhiella, and Gracilaria multipartita are more conspicuous; Petalonia grows to a 

 large size; while occasional plants of Grinnellia and Dasya are found. 



By January Champia and Chondria sedifolia have disappeared; Ectocarpus confer- 

 voides has replaced the summer species, E. mitchellae; Grinnellia has become conspicuous, 

 and small plants of Porphyra have appeared. 



