658 
IX. ALGAL 
\Dictyota. 
membranous, dichotomously decompound, narrowed at the somewhat woolly 
base; segments linear, quite entire, sinus rather acute, segments quite entire; 
apex obtuse or 2-lid. Sori or spores scattered over the whole surface of the 
frond except the margin. — J. Ag. Sp. Alg. i. 92. Zonaria, Harv. Phvc. 
Brit. t. 103. Dichophyllum, Kuetzing. 
Hawke’s Bay, Colenso ; Queen Charlotte’s Sound, Lyall. (Australia, Tasmania, S. 
Africa, Red Sea, Gulf of Mexico, North Atlantic.) 
22. DICTYOSIPHON, Greville. 
Frond olive-green or brown, tubular, branched, of 2-3 series of cells ; 
inner cells elongate, cylindric; superficial minute, coloured. Spores scattered 
over the whole surface of the frond. 
A genus of only two species, the following and a European one. 
1. D. ? fasciculatus, Hook. f. and Harv. FI. Antarct. i. 178. t. 69. 
y. 1. Frond 4-8 in. long, hardly coriaceous, lanceolate in outline; stem fili- 
form, clothed with numerous short quadrifarious cylindric divided fascicled 
attenuate or secund branches, 1-2 in. long; branchlets setaceous, erect, all 
acute, narrowed at both ends. Spores scattered over the whole frond, seini- 
immersed. — J. Ag. Sp. Alg. i. 
Lord Auckland's group, J. D. H. (Kerguelen’s Laud, Falkland Island.) 
23. ASPEROCOCCUS, Lamouroux. 
Root scutate. Frond pale olive-green, tubular, cylindric or saccate, rarely 
compressed, continuous, membranous, its walls thin. Spores scattered over 
the whole frond, in minute sori, roundish, mixed with clavate filaments. 
A northern as well as southern temperate genus. — Encoslium, Agardh. 
1. A. sinuosus, Bory ; — FI. N. Z. ii. 219. Frond forming hemi- 
spherical lobed expanded sinuous masses, from the size of a hazel-nut to that 
of the human head, finally cavernous and often laciniose. — J. Ag. Sp. Alg. 
i. 75. 
East coast, Capes Kidnapper and Turnagain, Colenso ; Otago, Lyall. (Australia, Tas- 
mania, Falkland Islands, N. and S. Atlantic, Indian Ocean, and Red Sea.) 
2. A. echinatus, Greville; — FI. Antarct. i. 180. Fronds tufted, 2 in. 
and upwards long, very variable in diameter, cylindric, clavate, much atte- 
nuated downwards. Sori oblong. — J. Ag. Sp. Alg. i. 76. 
Lord Auckland's group, J. D. 3. (Australia, Europe.) 
24. CHORDA, Stackhouse. 
Root scutate. Frond olive or yellow-brown or greenish, very long, 
simple, cylindric, tubular, its walls rather thick and fleshy, divided internally 
transversely by membranous septa. Sori covering the whole surface, con- 
sisting of stalked obconic spores and ellipsoid antheridia. 
