OF SOUTH AUSTRALIA. 
281 
grown plant 30 cm. to 50 cm. long. All the divisions of the frond issue at 
acute angles, strictly linear, and rounded at the top. The older ones 
strongly, the younger ones faintly midribbed, the midrib is pinnated with 
slender veins, which proceed to the margin, and are excurrent into the 
marginal tooth-like processes ; these latter are commonly trifid. The stichidia 
spring from the lateral veins of the segments, or from the midrib, and are 
excessively branched; they bear tetraspores singly or in pairs in the swollen 
upper divisions. Substance rigid. Colour dull red-brown. This species is 
closely allied to D. tridens, but is a larger and stronger growing plant. 
Western Australia (Garden Island, Fremantle). 
Dictymenia inter stincta J. Agardh. 
Frond smooth articulate, alternately pinnate, and irregular, with linear 
pinnellae. Midrib strong, and wider at the base, with smaller ribs running 
out to the linear pinnellae, interspersed with small teeth ; above fertile, 
narrow, linear, without ribs, somewhat irregular. Stichidia developed from 
the margin of the denuded pinnellae ; subcorymbose. Substance gelatinous, 
membranaceous. Adheres to paper, dark-brown red. 
South Coast of Australia. 
Dictymenia tridens (Mert.) Greville. 
Frond 15 cm. to 30 cm. long, from less than 2 mm. to 6 mm. in breadth, 
flat and membranaceous, linear, narrowed to the base and apex, furnished in 
the lower part with a strong midrib, which gradually becomes thinner and 
fainter upwards, and disappears below the apex, simple or divided into three 
Fig. 128 . — Dictymenia tridens. 
