OF SOUTH AUSTRALIA. 
295 
Among H erposiphonieae De Toni includes 
Polysiphonia pecien Areschoug. 
Frond minute, scarcely 5 cm. long, ecorticate; primary filaments creep- 
ing, secondary ones' erect, thinly branched ; ramuli linear, pinnate ; pinnae 
distichous with articulations, pinnae between the articulations spreading 
horizontally, slightly recurved, the upper side pectinate, pinnate ; pinnellae 
simple, subulate, longitudinally striate; articulate, four siphoned. 
South Australia (Port Adelaide). 
Subfamily Rytiphloeae (Decaisne) Kutzing. 
KEY TO THE GENERA. 
a. Pericentral cells six; lateral branches opposite. 
Branches of fronds complanate but not tall . . Protokutzingia 
Falk. 
aa. Pericentral cells five. Fronds tall. 
h. Ecorticate Amansia Lamour. 
bb. Everywhere corticate. 
c. Lateral branches opposite Enantiocladia 
Falk. 
cc. Lateral branches alternate. 
d. Fronds with narrow wings Rytiphloea. Ag. 
dd. Fronds with large wings. 
e. Lateral branches shortly dentiform, 
fronds plane, naked, not veined . . . . Vidalia Lamour. 
ee. Lateral branches denticulate, fronds leaf- 
like, each proliferation furnished with 
minute ramuli Osmundaria 
Lamour. 
ccc. No lateral branches. 
Margin of branches naked or minutely ciliate, 
disc with proliferations Lenormandia 
Sonder. 
PROTOKUTZINGIA Falkenberg. 
Frond erect, more or less regular, axis polysiphonous, articulate; six 
central siphons, two large ones opposite, cortex formed of many layers. 
Cortical cells gradually decrease in size. Principal rachis is long, circinate, 
curved in; secondary ramuli issue from both sides at regular intervals; 
lower ramelli frequent and regular, upper ones often matted. Cystocarps 
unknown. Stichidia rise from the upper ramelli normally, sometimes trans- 
formed. Apices involute. Tetrasporangia in double rows. 
Protokutzingia australasica (Mont.) Falkenberg. 
= Rhodomela australasica Montagne. 
Frond 20 cm. to 50 cm. or longer, almost terete, pinnate, irregularly 
branched; apices curved, ramuli attenuated, younger ones pinnate, pinnae 
