342 
THE SEAWEEDS 
pericarp. Tetraspores attached to ultimate, articulate and monosiphonous, 
pinnules, sessile or stalked, sparse or often aggregated, spherical, trian- 
gularly divided. 
Ptilota Hannafordii Harvey. 
Frond terete, velvety, irregularly bipinnately branched ; branches 
unequal, alternate, closely set with minute squarrose, subbipinnate pinnae ; 
pinnae articulate, alternate, opposed by one to two small ramuli dis- 
tichously, tri- or tetrastichously bipinnate, the ultimate pinnules subulate, 
and recurved, articulate. Tetraspores globose, subsessile on the ultimate 
pinnules. 
Attachment or holdfast a disc. Frond 10 cm. to 20 cm. high, having a 
percurrent stem and distichous, spreading, laxly-pinnated branches. The 
stem and all the larger and older branches are covered with a velvet-like 
pile of minute jointed hairs; young branches glabrous. The pinnae are 
articulated and whorled with ternate pinnules; the pinnules are recurved 
and sharp-pointed. Tetrasporangia globose, on very short pedicels, lateral 
on the ultimate pinnules, ternately partite. Colour dark-brownish or full- 
red. Substance firm and cartilaginous; does not adhere to paper. 
Victoria (Port Fairy, Warrnambool). 
Subfamily Dasyphileae. 
KEY TO THE GENERA, 
a. Fronds terete or slightly compressed. 
b. Fronds terete or slightly compressed, densely 
pilose, lower ramuli short, verticillate, not 
free Dasyphila 
Sonder. 
bb. Fronds terete. Ramuli shortly verticillate, 
everywhere free .... . . . . . . Mueller end 
Schmitz. 
aa. Fronds ancipitous-plane, superficially glabrous, 
ramuli shortly verticillate Psilothallia 
Schmitz. . 
DASYPHILA Sonder. 
Frond filiform, distichous, decompound-pinnate, inarticulate, fibroso- 
cellular, with an articulated monosiphonous axis; the surface densely 
clothed with articulated, free, hair-like ramelli. Favellae involucrate, ter- 
minating short branches, and containing numerous angular spores. Tetra- 
sporangia tripartite, formed at the tips of investing ramelli. 
Dasyphila Preissii Sonder. 
Frond filiform, distichous, decompound-pinnate, inarticulate, fibroso- 
cellular, with an articulated monosiphonous axis; the surface densely 
clothed with articulated, free, hair-like ramelli. 
