1919] Setchell-Gardner : Myxophyceae 113 



remained unknown to workers on this coast until recently. It has 

 not been possible to compare our plant with the type of Agardh's 

 Nostoc Qu&yi from the Mariana Islands, nor with Zanardini's Brachy- 

 trichm rivulariaidcs from Sarawak, Borneo, but comparison has been 

 made with B. Quayi from Woods Hole, Massachusetts, which, as has 

 been suggested by Collins (1890, p. 176), probably was introduced 

 some years ago from some of the southern islands through the instru- 

 mentality of guano ships or other human agencies. It has also been 

 compared with material of what seems even more likely to be the same 

 species from the Philippine Islands. 



Our plant is much smaller than those of B. Quoyi from Woods Hole 

 and from the Philippines, the specimens from Woods Hole sometimes 

 measuring up to 7 cm. in diameter. The largest specimen yet seen of 

 B. affinis measures about 2 cm. in diameter, the majority being less 

 than 1 cm. It is also m.uch more firm and cartilaginous, more pro- 

 fusely lobed and saccate. The cells are in general slightly larger 

 and the filaments more profusely branched. It may also be said that 

 the Massachusetts plants differ somewhat from those of the Philip- 

 pines. 



LITERATURE CITED 

 Agardh, C. a. 



1812. Dispositio algarum Sueciac, D. IV. Lund. 

 1817. Synopsis algarum Scandinaviae. Lund. 

 1817-1825. Aphorismi botanici. Decades I-XVI. Lund. 

 1821. Decas VIL 



1820-1828. Species algarum rite cognitae cum synonymis, differentiis speci- 

 ficis et descriptionibus succinctis. Lund. 

 1820. Vol. 1, part 1. (The Lund edition has 1820, while the "Gryphis- 



wald" edition has 1821.) 

 1822. Vol. 1, part 2. 

 1828. Vol. 2, part 1. 

 1824. Systema algarum. Lund. 



1827. Aufzahlung einiger in den ostroichischen Landcn gefundcnen neuen 

 Gattungen und Arten von Algen, nebst ihrer Diagnostik und bei- 

 gefugten Bemerkungen. Flora, vol. 10, p. 62.5. 



Agardh, J. G. 



1842. Algae maris Mediterranei et Adriatiei. Paris. 



Ardissone, F., and Strafforello, I. 



1877. Enumerazione delle alghe di Liguria. Milano. 

 Atkinson, Fi A. 



1905. A college text-book of botany, ed. 2. Henry Holt & Co., New York. 



BORGESEN, F, 



1902. The marine algae of the Ftieroes. Botany of the Faeroes, TI, p. 339, 

 Copenhagen. 



