OF SOUTH AUSTRALIA. 
343 
Attachment discoid. Frond 7 cm. to 15 cm. long, filiform, opaque, 
covered with minute hair-like ramelli. The ramification is distichous, the 
branches and their divisions being all alternate. The pinnae and pinnules 
are patent; the axils obtuse; and the ultimate pinnules subulate 2 mm. 
to 4 mm. in length. The ramelli are minute, irregularly branched, 
articulate, confervoid, joints scarcely twice as long as broad. The stem is 
as follows:- — A single axial tube of large diameter,, articulated and con- 
taining endochrome, runs through the whole frond ; round this are densely 
Fig. 169 . — Dasyphila Preissii : a, plant; b, cross- 
section of branch; c, longitudinal 
semi-section; d, tips of branches 
bearing favellae; e, favella with 
involucral ramelli; f, spores; g, 
ramellus with tetraspores; h, one of 
its fertile segments. (After 
Harvey.) 
packed innumerable longitudinal, articulated, coloured filaments; then a 
single, double or triple circle of larger longitudinal filaments ; and lastly 
the cortical layer, composed of slender filaments similar to those that invest 
the axis, and externally emitting the free horizontal ramelli that form the 
velvety surface. The favellae are borne tw r o or three together on the tips 
of short branches, where they are densely involucrated with slender, hair- 
like, incurved ramelli. The tetraspores occur abundantly, on separate 
individuals, on the tips of the ramelli. Colour dark red-brown ; substance 
rigid; does not adhere well to paper. 
South Australia (Encounter Bay, Eastern Bays), West Australia. 
Tasmania. 
