Ser. CHLOROSPERME. Kam. Ulvacee. 
Prats CCLXXXII. 
ENTEROMORPHA RALEFSII, Harv. 
Gen. Cuar. Frond tubular, membranaceous, of a green colour, and reti- 
culated structure. Fructification: granules, commonly in fours, 
contained in the cells of the frond. Enreromorrna (Link),—from 
evtepov, an entrail, and popdn, form or appearance. 
Enreromorpua Ra/fsii; frond capillary, simple, or having a few short, 
spine-like ramuli, nearly solid, laxly reticulated; the cells large, 
hyaline (two to four in the breadth of the frond), each cell containing 
a brilliant-green grain of endochrome. 
Has. On the oozy sea-shore, above half-tide level, spreading widely. 
Annual. Summer. Bangor, North Wales, &c., Mr. Ra/fs. 
Groep. Distr. (?) 
Descr. Fronds many inches long, exceedingly slender, varying from less than 
the diameter of human hair to nearly that of horsehair, densely aggre- 
gated, decumbent, and spreading in wide, continuous strata, which 
cover any object they encounter. Each frond is simple, unbranched, or 
rarely having a few short, spine-like ramuli scattered here and there; it is 
curled or flexuous, and sometimes the fronds are so much rolled together 
and bundled, that it is difficult to disentangle them. The cells of which the 
frond is composed are remarkably large, sometimes two, sometimes four 
forming the breadth of the filament; each cell is hyaline, glassy, somewhat 
distended, and contains a bright-green grain of endochrome in its centre. 
I have not observed any fructification. 
I had prepared the plate here given for the purpose of illus- 
trating Lateromorpha percursa, in the full belief that the speci- 
mens from which I made my figure were authentic examples of 
that species, having received them from Mr. Ralfs under that 
name :—but, happening to show the figure to my friend Mr. 
Thwaites, that acute botanist assured me that 7. pereursa was 
something very different. I admit that the diagnosis of #. pur- 
cursa given by Carmichael will not apply to my plant. Of the 
original 2. percursa I have, then, as yet seen no specimens, and 
the plate having been engraved and printed I cannot hold it 
back for a more minute examination and consultation. I am, 
therefore, compelled to publish Mr. Ralfs’s plant as a novelty, 
and (if it be new) have great pleasure in bestowing his name 
