364 THE JOURNAL OF BOTANY 
discovered at last in ove of our plants instances of an ‘ anasto- 
mosis ’’—not er aeg of the filaments of the flabellum, but of the 
lines of calcareous cement which fills the grooves between con- 
lso 
the base of each branch of a dichotomy. This can be made clear 
by figures. Fig. 4a shows the ‘‘ anastomosis” as represented by 
Montagne, who mistook the shaded parts for filaments, while in 
reality they are merely lines of calcification outlining the dichotomy 
of a real filament. Fig. 4b renders rte more obvious; while 
fig. 4c shows the same dichotomy decalci 
In o order to verify our conc clusions, es “compared the Siboga 
specimens with Montagne’s type in Herb. Mus. Paris, kindly lent 
er 
(Fi Rhipidosighom javensis, but larger and better grown specimens. 
1g. 
The existences of anastomosis being thus definitely ~— in 
Rhipidosiphon, it is no longer possible to maintain the gen It 
always compo 
bearing numerou pliteral’ britichleta, which form a calcified cortex. 
We therefore merge Rhipidosiphon in Udotea, thus adding to the 
ig genus one species, with the pote diagnosis slightly altered 
fro ontagne’s original description :— 
norma JAVENSIS (syn. Iiidenptn javense ee om Frons 
constituta, a hie ane a su one skcninih fimbriata seepe 
fissa, crusta calearet obdu 
Hab. Ad comida in oris insule# Leyden Batavie, Hombron! 
eae Ferguson! (no. 489); Malay Archipelago, Mme. Weber van 
osse! 
CALLIPSYGMA. 
This genus is hardly more than a name to most people. It was 
described by J.G. Agardh in Tull Algernes Systematik viii. pp. 65-67, 
and there are, so far as we know, only two specimens extant, being 
parts of the same hantia ian plant; one is in eer gardh herbarium 
at Lund, and the other in the Bracebridge Wilson “collection in the 
British Museum (fig. 5a, b), The Lund specimen we have not 
