— 194 — 
Hydroclathrus Bory. 
32*. Hl. eancellatus Bory Dict. VIII. p.119; De Toni Syll. Ill. p. 490. — 
Asperococcus cancellatus Endl. — Encoelium clathratum Ag. — Asperocoecus 
clathratus J. Ag. 
The specimens from the Koh Chang-Strait represent a very fine and 
delicate form. 
Koh Chang-Strait; Koh Kahdat, abundant on rocks and stones between 
tide-marks. 
Area: Atlantic; Red Sea; Indian and Pacific Oceans; Siam (Simaharadscha), 
Asperococcus Lamx. 
33. A. fastigiatus Zanard. Phyc. indic. Pug. p. 134, t. 3. De Toni 
Syll. Il. p. 496. 
f. major Reinb. n. f. 
fronde duplo crassiore et altiore sed minus ramosa quam in forma 
typica. 
I think the present plant cannot be separated from A. fastigiatus, 
but it represents a remarkably robust form. The fronds are (in exsiccatis) 
about 5mm. broad but less branched than the type in Zanardini’s figure. 
For the rest our plant offers the same characteristic features as the 
main species; the tips of the segments, simple or forked, are rounded 
and the diameter of the frond is nearly the same in all parts of the plant. 
The specimens are provided (at the end of December) with pluriloc. 
sporangia which are collected in definite sori dispersed over the frond. 
Koh Chang-Strait near Lem Ngob, in shallow water. 
Area: Sarawak. 
Dictyotales. 
Dictyotaceae. 
Dictyota Lamx. . 
34. D.dichotoma (Huds.) Lamx. in Desv. Journ. Il. p. 42; De Toni 
Syll. IIL. p. 263. — Ulva dichotoma Huds. Flor. angl. p. 476. 
Koh Chang-Strait at Lem Ngob, cast ashore. 
Area: Common in all temperate and warm Oceans. 
35. 1D. Barteyresiana Lamx. Dict. Nr.17; De Toni Syll. III. p. 262. — 
D. cuspidata Kg. Tab. phye. IX. t. 80. 
The specimens represent in part a somewhat broad form of this very 
varying species. 
Koh Kahdat, in 1—2 fathoms water (coral-sand). 
Area: W. Indies; Tropic. Australia; Ceylon (probably more widely 
distributed in warmer Seas). 
