124 Rhodora [July 



than those of E. IVitfrockii, averaging 6 pt diameter; the branching is 

 more abundant and irregular; the cells vary from one to six diameters 

 long, and are quite irregular in form, not nearly cylindrical, as in E. 

 Wittrockii. A good figure will l)e found with the original description 

 as Enforladia virldis lieinke, in Bot. Zeit., p. 476, PI. \ I, 1879. In 

 Europe it has more southern range than E. Wiitrnrlxii. 



AcROCHAETE REPENS Pringsheim, Abh. Konigl. Akad. Wiss., 

 Berlin, p. 4, PI. II, 1S()2. In this ])ai)er on the m()r|)hology of nuirine 

 algae, Pringsheim published two nearly related genera of green algae, 

 Acrochaete and Bolbocoleon, both growing in the tissue of brown algae, 

 at the island of Helgoland. In each there is a more or less branched 

 filament, creeping among the cortical cells of the host, and bearing 

 very long and slender bristles, which project beyond the surface of the 

 host; but the character of the bristles is different in the two. In 

 Acrochaete they arise each from the terminal cell of a short lateral 

 branch; in Bolbocoleon the hair projects from a specialized nearly 

 empty cell; this is partitioned off from the vegetative cells, and has a 

 relatively large bulbous base to the long sheath. Bolbocoleon pilifenim, 

 the original and oidy species, has been found to have (juite a wide 

 distribution, but Acrocliaefe repens seemed to be limited to a small 

 district in northern Europe. It was therefore interesting to find it 

 occurring in considerable abundance at Wood's Hole, Ma.ss., Sept. 1, 

 1905, in fronds of Chorda Filum (L.) Stack., the host plant of the 

 original station. Distributed as P. B.-A., No. 1279. 



Bryopsis HYPXoinKS Lamouroux, Journal de Botani(|ue, p. 135, 

 1S09. Wiiile there have been occasional reports of the occurrence 

 of this species on the New England coast, the writer has failetl to 

 obtain specimens confirming them, and it has seemed probable that 

 all should be referred to B. phnno.sn (Huds.) Ag. A specimen from the 

 herbarium of Ca})t. X. Pike, marked B. hijpnoides, is evidently B. 

 phimosa. Recently Mr. .1. A. Cushnum submitted to the writer a 

 small collection of algae from Ilorseueck Beach, near New Bedford, 

 and in this collection was a single sj)ecimen agreeing ])erfectly with 

 European specimens of B. hi/piioides. This was of course enough 

 to give the s])ecies a place in our lists; and in ^lay, 190"), it was found 

 washed ashore at Mattapoisett, Mass., in sufficient ([uantity for it to be 

 distributed as P. B.-A., No. 1286. Unfortunately some plants varied 

 considerably from the type in the direction of B. plmnom. In B. 

 hfipuoides the branches of successive orders decrease gradually in 

 size, those of each order being arranged spirally about their axis; in 



