158 260 
Hydrocharitaceze, Lemnacez, Pontederia- 
ceze, Potamogetonacez, Gentianaceze (Lim- 
nanthemum), Nymphzeaceze 
by C. H. Ostenfeld — Copenhagen. 
Hydrocharitacee. 
Blyxa Thouars. 
1. J. sp. (octandra (Roxb.) Planch. ?). 
It is impossible to determine the collected specimens of Blyxa because 
they are sterile. 
Rice-field near Lem Dan. 
Area (of B. octandra): Tropical Asia and Australia. 
Halophila Thouars. 
2. WH. ovalis (R. Br.) Hook. fil., Fl. Tasman. II, p. 45; B. Balfour, On 
the Genus Halophila, Transact. and Proc. of the R. Soc. Edinburgh vol. XIII, 
1879, p. 290; Caulinia ovalis R. Br., Prodr. Fl. Nov. Hollandie p. 339, 
H, ovata Gaud., in Freycinet, Voy. Bot. p. 429, t. 40, f.1; Hook. f., FI. 
of British India V, p. 663. 
The few present specimens which are sterile, belong to f. minor 
(Zoll.) Aschs., Linnea 1867, p. 174 (Lemnopsis minor Zollinger, Verzeichn. 
1854, p. 75). 
Between Koh Riat and Koh Mesan, in 3—5 fathoms water (coral-sand). 
Area: Shores of the Indian, Malayan, Australian and Pacific Oceans (from 
the Canal of Suez to Luchnan Islands (Japan)). 
3. HL decipiens Ostf., n. sp. 
Leaves oblong-elliptic, their ventral surfaces hairless, but their 
dorsal surfaces and the margins covered with very fine, short, uni- 
cellular star hairs or teeth; the same hairs are found on the out- 
side of the scale- and spathe-leaves; from the midvein of the foliage 
leaves 6—9 lateral veins pass on each side outwards to the intra- 
marginal vein; the petioles 1/2—1 time as long as the lamine. 
Plants moneecious, flowers unisexual, 1 male and 1 female 
flower enclosed in the spathe-leaves, corresponding in regard to 
structure etc. very closely with those of H. Baillonis (see: Theo. 
