— 191 — 
Valonia Ginn. 
20. Y. utrienlaris Ag. Spec. p. 431; De Toni Syll. I. p. 376. — 
V.utricularis f. aegagropila Hauck Meeresalg. p. 469. — V. aegagropila Ag. 
With Hauck 1. c. I consider V. aegagropila only a form of V. utricularis. 
Koh Kahdat, on coral-reefs in shallow water. 
Area: Mediterranean; Atlantic; Indian and Pacific Oceans. 
21. .Forbesii Harv. Alg. Ceyl. exsice. N. 75; De Toni Syll. I. p. 374. 
Koh Kahdat, in 1—2 fathoms water (coral-sand). 
Area: Indian Ocean; warm Pacific. 
Struvea Sond. 
22, St. delicatula Kg. Tab. phyc. XVI. p. 1 t. 2; Murr. et Bood, 
Struvea. p. 281, Nr. 6; De Toni Syll. I. p. 366. — Cladophora 
anastomosans Harv. Mar. Bot. W. Austr. Nr. 39. Alg. aust. exsicc. Nr. 582. 
Little plant and fragments only, which are however characteristic enough. 
Koh Lom, on coral-reefs in shallow water. 
Area: Guadeloupe; Ceylon; Australia, N. Caledonia. 
Siphonocladus Schmitz. 
23. §S. Zollingeri (Kg) Born. in Hariot in Jour. Bot. 1887, p. 56; 
De Toni Syll. Lp. 358. — Cladophora (Aegagropila) Zollingeri Kg. 
Spec. p. 415, Tab. phyc. IV. t. 64. 
Off Koh Kahdat, in 5 fathoms water (coral-sand). 
Area: Java. 
Boodlea Murr. et De Toni in Journ. Linn. Soc. Bot. XXV. 
24. B. (coacta var?) Siamensis Reinb. u. sp. 
B. intricata, subspongiosa; filamentis primariis paullulum laxe 
ramosis, ramis dense divaricatimque quoquoversum ramulosis; 
ramulis hinc illinec ope tentaculorum inter se cohaerentibus; articulis 
longitudine valde inaequalibus, primariis ad 200 », ramulorum c. 
30—40 yp» crassis, articulis terminalibus apice obtusis; articulis 
primariis saepe elongatis usque 20plo diametro longioribus. 
This is a true Boodlea and, as I think, a good species nearly related 
to B.coacta, but which by other algologists may perhaps be considered 
only a variety of the latter. 
Our plant differs from B. coacta — of which I have a specimen from 
Japan (leg. Okamura) beside me for comparison — by somewhat less 
compact and less sponge-like habit, as the primary filaments, provided 
in part with much elongated joints, are not so densely beset with main 
branches. The density however of the branches of the second order and 
Botanisk Tidsskrift. 24, Bind. 13 
