206 
W J h r^IS : P( )D< >ST K M A C P Æ 
Thallus fiicoid or dimorphic, 
usually freely floating ; 
secondary shoots 1 -flowered 
with scaly bracts ; fruit 
isolobous 
Thallus thread- or ribbon-like, 
creeping ; secondary shoots 
erect, with several flowers ; 
bracts dithecous, not scaly ; 
fruit anisolobous 
Fruit smooth, anisolobous, dehis- 
cent, with oo seeds. Spathe erect, 
toothed or bifid. 
Thallus fucoid or attached and 
closely creeping ; secondary 
shoots small with distichous 
leaves 
Thallus crustaceous, attached to 
rock, secondary shoots large, 
erect, with 4-ranked leaves. 
Spathe bi-lobed at tip 
Fruit ribbed iso- or aniso-lobous 
dehiscent, or smooth anisolobous 
dehiscent or indéhiscent, with oc 
or few seeds. Spathe more or less 
prostrate, splitting along the upper 
side. Thallus closely attached to 
rock. 
Thallus crustaceous or ribbon- 
like, exogenously lobed or 
branched ; secondary shoots 
usually prostrate when flor- 
iferous, 1-flowered with small 
scaly bracts. Seeds oc , fruit 
dehiscent, iso- or aniso-lobous, 
ribbed, or smooth 
Dicrœa. 
Podmtemon. 
Griffithella 
WilUsia. 
Hydrohryum. 
