352 Notes on Marine Algos. By Edward A. L. Batters. 



yellowish-green, but it often happens that much greener patches 

 are to be seen mixed up with the ordinary coloured fronds in the 

 same mass. 



Holy Island and Fenham Flats. Not uncommon. 



11. Vaucheria velutina. Ag. Earv. Phyc. Brit., PL 321. 

 Filaments creeping, forming exceedingly dense cushion-like 



strata on mud. Branches erect simple or forked rising to one 

 height. The tips of the branches, which rise above the mud, are 

 bright green, the creeping filaments themselves are either colour- 

 less or stained by the mud in which they are growing. The 

 creeping filaments are often densely interwoven and firmly fixed 

 in the mud, the larger portion of them being usually dead " with 

 a very offensive odour." The spherical vesicles, filled with a 

 dark green granular mass, are not unfrequent. Vesicles either 

 stalked or sessile usually produced on the upright branches but 

 sometimes also on the creeping ones. 



Estuary of the Tweed, and on the muddy banks of the river as 

 far as the " Plantation." Very common. 



There are several other species of the genus Vaucheria to be 

 found on the soft mud below the foot bridge, but as I have never 

 found them in fruit it is impossible to say to which species they 

 should be referred. 



12. Fucus vesieulosus, Linn. var. B. suhecostatus. 



(Fucus Balticus. Ag. Sv. Bot. t. 516, Grev. Crypt, Fl. t. 181. 

 Harv. Phyc. Brit. Desc. plate 204.) 



Fronds small, from an inch to two inches high, narrow, usually 

 dichotomous and destitute of air vessels. Midrib very indistinct. 



No one at first sight would take this plant to be a variety of 

 F. vesieulosus ; it seems to come very much nearer F. ceranoides. 

 Its small size, want of air vessels, and the almost entire absence 

 of midrib, mark it as a very distinct variety. It grows in salt 

 marshes, usually on the soft mud round the margins of pools. 



Banks of the Tweed a little way above the railway bridge. 

 Not uncommon. 



13. Didyosiphon hippuroides. Aresch. Obs. Phyc. III., p. 27, 

 Phyc. Mar. 8c., tab. 6., A. 



Fronds brown, from a few inches to a foot or more long, 

 filamentous, rather densely beset with irregularly alternate, 

 sometimes opposite, branches which are rebranched again in a 

 similar manner. Always parastical on Chordaria flagelliformis, 

 which it often covers so densely that the " host plant " is hardly 



