OF SOUTH AUSTRALIA. 
325 
Subfamily Griffithsiae Schmitz. 
GRIFFITHSIA Agardh. 
Frond filiform, dichotomous, articulated, monosiphonous, naked. Favellae 
involucrate, containing numerous angular spores. Tetrasporangia attached 
to the inner faces of involucral ramelli, globose, triangularly parted. 
Griffiihsia ovalis Harvey. 
Attachment or holdfast discoid. Fronds solitary, scattered, 2 cm. to 
5 cm. high, flabelliform, subfastigiate, dichotomously or subtrichotomously 
branched, the branches erecto-patent, the upper ones fairly regularly dicho- 
tomous. Articulations three to four times as long as broad, the larger ones 
3 mm. in diameter, inflated, very much constricted at the nodes; the lower 
ones club-shaped or pyriform, the middle ovate or oblong, the upper more 
exactly oval, the terminal at first globose, then oval. Involucres whorled 
round the upper nodes, not on separate ramuli ; involucral ramelli very 
minute, of few cells, bearing large tetraspores at their tips. Tetrasporangia 
globose, with wide borders. Colour pale-red, fading to horn colour. The 
in situ ; c, ramelli and tetraspores from 
an involucre. (After Harvey.) 
