OF SOUTH AUSTRALIA. 
291 
Subfamily Herposiphonieae Schmitz and Falkenberg. 
DIPTEROSIPIiONIA Schmitz and Falkenberg. 
Frond creeping, shield-shaped, apex erect, terete, ecorticate for some 
distance, with five or more central siphons ; pinnately branched, the pinnae 
dichotomous, the long wings simple or branched, apices straight, shorter 
wings simple, alternately branching from the rachis. Tetrasporangia 
mainly on the shorter pinnae or the simple long ones, arranged on the 
convex side in a simple straight row, or a slightly broken one. Antheridia 
on the short pinnae, short, cylindrical, pedicellate. Cystocarps ovoid, sessile 
on the wings, single or in pairs. 
Fig. 136. — Herposiphonia prorepens: 
a, part of a frond of 
Dicranema Grevillei, with 
Herposiphonia prorepens 
growing on it; b, creeping 
branch and ramuli of H. 
prorepens; c, base of 
ramulus and part of creep- 
ing stem; d, apex of 
ramulus, with a cera- 
midium; e, cross-section. 
(After Harvey.) 
Fig. 137. — Lophosiphonia Calothrix: 
a, patch of L. Calo- 
thrix on a piece of 
rock; b, part of the 
creeping frond, and 
erect ramuli; c, apex; 
d, middle portion of 
a ramulus. (After 
Harvey.) 
Dipterosiphonia dendritica (J. Ag.) Falkenberg. 
= Polysiphonia dendritica J. Agardh. 
Frond dwarf, 5 cm. long, wholly prostrate, distichous, pinnate, irregular, 
pinnae dichotomous, alternate, the lower ones simple, subulate; the upper 
ones more or less irregular, articulate, with five siphons. Tetrasporangia as 
above. Cystocarps long, pedicellate, ovate. Substance soft, adheres to 
paper. 
Victoria (Port Phillip), New Zealand, Brazil. 
