196 THE FLORA OF SINGAPORE 
S. sp. Small plant, Bukit Timah, No. 6547. 
Psilotum flaccidum Wall. On trees in mangrove swamps, Kranji 
P complanatum Sw. Mangroves, Sungei Morai, Kranji. 
RHIZOCARPEAE. 
Azollu pinnata R. Вг. А small floating plant. Ditches, common, 
Tanglin, Ang Mo Kio, Galang. 
Addenda. 
Ludwizitparvifora Roxb. Ditches, Tanglin. 
Enhydri ias angustipetala Ridl. Common in pon nds and ditches, 
is new genus must be РЕ in place of Hydrilla 
verticillata, for which it was mistaken 
