— 194 — 



Hydroclathrus Bory. 

 32*. II. cancellatus Bory Diet. VIII. p. 119; De Toni Syll. III. p. 490. - 



Asperococcus cancellatus Endl. — Encoelium clathratum Ag. — Asperococcus 

 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. fastigiatiis Zanard. Phyc. indie. Pug. p. 134, t. 3. De Toni 

 Syll. III. 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 5 mm. 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. II. p. 42; De Toni 

 Syll. III. p. 263. — Viva dichotoma Huds. Flor. angl. p. 476. 



Koh Chang-Strait at Lem Ngob, cast ashore. 



Area: Common in all temperate and warm Oceans. 



35. ». Baiteyiesiana Lamx. Diet. Nr. 17; De Toni Syll. III. p. 262. — 

 D. cuspidata Kg. Tab. phyc. 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 vvidely 

 distributed in warmer Seas). 



