5 
summer; it differs from the type by the flattened, not constricted _ 
frond, and by the lack of paraphyses when in fruit. Distributed 
in Phyc. Bor. Am. no. 173. 
Fucus Arescuouci Kjellman, Handbok i Skandinaviens Hafsalg- 
flora, I: IT. 
A northern form, growing on exposed rocky shores near high- 
water mark. It resembles some forms of F-. vesiculosus that grow 
in similar localities, but is distinguished by the hermaphrodite 
conceptacles. The narrow, closely and regularly forked fronds 
with the ultimate segments at nearly uniform height, and ending 
in small spherical or ovate receptacles, distinguish it from F eden- 
Zatus and Ff. evanescens, both of which, moreover, grow near low- 
water mark. It approaches nearer to F. platycarpus, and the re- 
ceptacles are often margined as in the latter; there may be inter- 
mediate forms, but the types seem distinct, F. platycarpus being a 
larger plant with broader frond, and having the fruiting segments 
lateral. /. Areschougii occurs from Marblehead northward, and is 
very commonion the coast of Maine. 
CHANTRANSIA CORYMBIFERA Thuret. 
This interesting species, the only one of the genus in which 
occurs a true sexual reproduction by means of antheridia, tricho- 
gynes and carpospores, was collected for the first time in America 
by Mr. George Waterman, in August 1893, at Marblehead, Mass. 
It has since been found at Wood's Hole, Mass., by Mr. C. P. Nott, 
and specimens from the latter locality are distributed in Phyc. 
Bor. Am. no. 192. In both localities it grew on Ceramium 
rubrum and Cystoclonium purpurascens. Figured and described in 
Bornet & Thuret, Notes Algologiques, 16. p/. 5. 
PEYSSONELLIA RoseENviNGII Schmitz, in Rosenvinge, Gronl. 
Hav. 782. 7.8. A specimen which-I found at Spectacle Island, 
July, 1894, is identified by Rosenvinge with this species. It fs = 
grew on a mussel shell, and I have found the same species on — 5 
Several occasions growing on the shells of live crabs. In every. |. 
case it grew, not directly on the crab or mussel shell, but ona 
Lithothamnion, which Rosenvinge identifies with L. circumscriptum 
Stromf. Whether the P. Dudyi of Farlow’s Manual i is the same as 
this, or whether we have two species, I cannot oy jas ae as I 
