158 Rhodora [August 



is found in all parts of the Baltic; the first American locality is New- 

 port, R. I., where it was collected by Mrs. W. C. Simmons in June, 

 1899; since then a s|)ecimen has been received from Prof. John 

 IMacoun, collected at Louisburg, Nova Scotia. The Rhode Island 

 plant is very little branched, and is of a softer texture than the Nova 

 Scotia plant, or than authentic European si^ecimens; otherwise they 

 are much the same. 



JNIvRiONEMA CoRUN.VAE Sauvagcau, Annales des Sciences Nat- 

 urelles. Series S, Bot., Vol. \\ p. 237. In general appearance not 

 unlike M. vulgare Thuret, this ])lant is distinguished by the usually 

 very abundant plurilocular sporangia, cylindrical or slightly torulose, 

 5-7 /< diameter, 2.5-120 /< long, the cross walls often quite oblique, lon- 

 gitudinal divisions occasionally occurring. The sj)orangia are either 

 sessile on the basal layer, or borne on a one- to four-celled j)edicel. 

 They are long and mostly pediccled at the center of the basal disk, 

 becoming shorter and sessile near the margin; usually simple, thev 

 are occasionally branched; hairs are found occasionally, but not 

 commonly; unilocular sjjorangia, so common in M. riilgair, are 

 unknown in M. Corunuae. Sauvageau found no assimilative fila- 

 ments, but Jonsson, Botanisk Tidsskrift, Vol. XX\^ p. 144, men- 

 tions and figures them, in .size and shape much like the sporangia, 

 but with longer cells. He describes a variety filamentosa, in which 

 the filaments of the basal portion are free, not united into a disk. In 

 material collected in Casco Bay, .Alaine, all intermediate forms be- 

 tween the type and the variety were found. It occurs also at Wood's 

 Hole, INIass., and at Newport, R. I., in each case on Laminaria, on 

 which it is found also in Europe. Distributed as P. B.-A., No. 1234. 

 LiTHODERMA FATi.scExs Aresclioug, ( )bservationes Phycologicae, 

 part III, p. 23. It is probable that two species, whh quite different 

 types of plurilocular sporangia, have been included under this name; 

 the matter has been carefully gone over by Kuckuck, Wissentschaft- 

 liche Meeresuntersuchungen, Neue Folge, Vol. I, p. 237, 1S94. The 

 plurilocular fruit having never been recorded in America, while the 

 unilocular fruit in the specimens to be noted here agrees with Kuc- 

 kuck's description and figures, there is little risk in our identification. 

 In habit and general stru<'ture it resembles Ralf.'^ia rcrntrosa Aresch., 

 but the cells contain each several small chroinatophores. instead of 

 the single large chromatophore of Ra/f.s-ia; the unilocular sporangia 

 are terminal, each at the end of a vertical filament. While sterile 



