156 ALGH OF MAURITIUS. 
20. Enteromorpha compressa, Link.— Grev. Alg. Brit. 180. 
t. 18. Solenia compressa, Ag. Syst. p. 186. 
These plants appear to be as abundant in the Mauritius 
as they are with us, and to preserve all their peculiar charac- 
ters, unaltered by climate. 
ECTOCARPE.E. 
21. Sphacelaria cupressina, (Harv. MS.); stupa nulla, 
ramis subalternis simplicibus densissimé ramulosis, ramulis 
distichis abbreviatis divaricatis oppositis multifidis spinulosis, 
articulis brevissimis. 
A very curious new species, with a good deal the habit of 
Cladostephus, but differing on a close inspection in the disti- 
chous multifid ramuli. Stems 1—2 inches high, irregularly 
branched; branches thick, simple, spreading, densely clothed 
with short, distichous, divaricating, mostly opposite, multifid 
ramuli, whose outer edge is often furnished with short conical 
spines; apices cloven. Colour a dark brown. Articulations 
not half so long as broad, obscure in the stem, 2-striated 
in the ramuli. "The lower part of the stem is often furnished 
with irregularly branched, articulated fibres, bare of ramuli, 
but of a similar structure to the branches, and quite unlike 
the *stupa" found in other species of the genus. 
22. Cladostephus Lycopodium, (Ag. Spec. Alg. v. 2. p. 14 
Fucus Lycopodium, Turn. T. 199.); setis patentibus simplici- 
bus flexuosis obtusis. 
I have only seen a single specimen of this curious species, 
but Turner's admirable figure leaves no room for doubting 
the correctness of the reference. Frond vaguely branched; 
primary thread thick, densely covered with slender, flexuose; 
patent, horny, articulated ramuli of 2 lines or more in length; 
the apices of the branches (in conjunction with the ramuli) 
very obtuse, joints as long as broad, densely striated longi- 
tudinally, Substance very rigid and horny, much like that 
ofa zoophyte. Fruit, on Mrs. Telfair's specimen, dark brown 
granules, imbedded in the distorted apices of the ramuli. 
