OF SOUTH AUSTRALIA. 
327 
Subfamily Monosporae Schmitz. 
BORNETIA Thuret. 
Frond erect, filiform, dichotomous or laterally branched, articulate, mono- 
siphonous, naked. The short lateral branches are fertile. Cystocarps at 
the apices of the ramuli. Carpospores pyriform, radiating everywhere from 
the placentary cells, placed singly on regular hyaline saccules. Tetra- 
sporangia arranged on the inner side of the involucre at the articulations, 
fasciculate; young ones pyriform, fully developed ones almost spherical, 
pedicellate, triangularly divided. Antheridia small, arranged at the invo- 
lucre in same way as tetraspores. 
J. Agardh regards the nature and structure of the ’frond as very close to 
Griffithsia. 
Bornetia Binderiana (Sond.) Zanarclini. 
= Griffithsia Binderiana Sonder. 
Frond 2 cm. to 5 cm. long, erect, dichotomous ; all ramuli subsecund, sub- 
flabellate, widely patent above the axils; the lower ramuli articulate and 
cylindrical, upper ones obconical, divided at the articulations, the shorter 
