148 ALGE OF MAURITIUS. 
the leaf, bears a considerable resemblance to S. ilicifolium 
(Turn. T. 51) according to Agardh, to S. aquifolium, 
(Turn. T. 50). Stems flat, a line or two broad, simple, pin- 
nated with patent branches ; leaves obovate, tapering to the 
base, obtuse, carinated, mostly recurvo-patent, their nerve | 
reaching half way, margin spinuloso-dentate, furnished on 
the upper surface with a transverse lamina whose margin is 
also spinuloso-dentate : vesicles not numerous, large, sphzeri- 
cal, margined, on expanded supfoliaceous stalks. I have not 
seen the receptacles. 
3. Sargassum obovatum, (Harv. MS.); caule plano alterné 
ramoso, ramis patentibus, foliis densis oblongo-obovatis sub- 
petiolatis seminerviis serratis, vesiculis sparsis ellipticis vel 
pyriformibus, petiolo clavato vesicato, receptaculis axillaribus 
caespitosis ramosissimis. 
Closely allied to S. vulgare, from which it chiefly differs 
in the obovate leaves, vanishing nerve, pyriform vesicles and 
more branching receptacles. Stem robust, simple, flat, pin- 
nated with spreading short alternate branches ; leaves densely 
set, obovate or oblong, tapering from beyond the middle into 
a short footstalk, the margin mostly entire below, above 
sharply serrate: vesicles scattered, pyriform, gradually pass- 
ing into an inflated stalk : receptacles densely tufted, axillary; 
much branched, sometimes palmate. 
4. Turbinaria denudata, Bory.—Fucus turbinatus. Turn. 
T. 24. 
DICTYOTEA. 
5. Dictyota furcellata, (Grev.—Zonaria furcellata, Ag 
Syst. p. 266); fronde lineari subfiliformi laxé dichotom4 
valdé flexuosa intricata, axillis patentibus obtusis, laciniis 
sensim attenuatis. 
This forms large entangled masses of a dark brown colour? 
the frond is half a line broad, nearly equal throughout, the 
last segment slightly attenuated, distantly dichotomous, the 
margin waved and often curling when dry; axilla patent 
obtuse. Fructification single; seeds disposed in close trans- 
