IX. ALG-rE. 
669 
Polysiphonia.] 
Akaroa, Raoul ; Cape Kidnapper and Parimahu, Colenso. 
8. P. macra, Harv. in FI. N. Z. ii. 229. A small and imperfectly- 
known plant, forming matted patches on rocks, similar in many respects to 
P. implexa, but the branches are more simple ; the articulations are similar 
and shorter. 
Akaroa, Raoul ; Hawke’s Bay, on tidal rocks, Colenso. 
9. P. rudis, Hook. f. and Harv. FI. N. Z. ii. 229. Fronds small, 
1-li in. long, densely tufted, dark-brown, rigid, obovate in outline. Stems 
erect from matted creeping filaments, slender, irregularly branched ; branches 
erect, subfastigiate, alternate ; lower long, simple ; upper pinnated above ; 
pinnules erect, subulate, elongate; articulations pellucid at the nodes, of the 
branches 2-3 times longer than brofkl, of the branchlets 1^ times. Tubes 
3-4. Tetraspores in one row in the swollen tips of the branches. — Harv. 
Ner. Austr. 44; J. Ag. Sp. Alg. 946. 
Cook’s Straits, Lyall ; Akaroa, Raoul; Lord Auckland’s group, J.D.H. 
10. P. dumosa, Hook. f. and Harv. FI. Antarct. 182. t. 75./. 1. 
Fronds tufted, dark red-brown. Stems erect, rigid, 1-3 in. long, flabellately- 
branched ; branches fastigiate, simple or forked, clothed with very spreading 
squarrose multifid branchlets /a - ! in. long ; pinnules divaricate, subulate ; 
articulations about as long as broad ; cells about 5, lower coated with a band 
of smaller cells. — Harv. Ner. Austr. 42 ; J. Ag. Sp. Alg. 950. 
Parasitic on larger Alga , Campbell’s Island, J. I). H. — J. Agardh suspects that this, 
which Harvey places near P. Lyallii, is better placed here. 
11. P. strictissima, Hook. f. and Harv. FI. N. Z. ii. 227. Fronds 
densely tufted, dark red, flaccid. Stems 4-6 in. long, setaceous and rigid 
below, capillary and excessively branched above ; branches fastigiate, lower 
spreading with obtuse axils, upper erect or appressed, with very acute axils ; 
lower articulations about as long as broad, upper 5 times as long. Tubes 4. 
- — Harv. Ner. Austr. 42 ; J. Ag. Sp. Alg. 962. 
New Zealand, Raoul ; Port Underwood, Lyall. 
12. P. amphibia, Harv. in FI. N. Z. ii. 229. Fronds in dense in- 
tricate red-brown tufts, 2-3 in. high. Stems capillary, rigid, much-branched, 
attenuated upwards, decompoundly-branched ; branches and branchlets irre- 
gularly alternate ; axils spreading ; branchlets often multifid at the tips ; 
articulation about twice as long as broad, upper much longer. Tubes 4. 
Tetraspores small. 
Massacre Bay, in brackish water when covered at high tide by the sea, Lyall . — Allied to 
the European P. urceolata } which also inhabits brackish water. 
13. P. abscissa. Hook. f. and Ilarv. FI. N. Z. ii. 227. Fronds 
densely tufted, 3-6 in. high, bright-red. Stems capillary, flaccid, alternately 
decompound ; smaller branches naked below, fastigiately-branched and trun- 
cate at the top ; tips naked or fibrilliferous ; articulations of the branches 
much longer than broad, of the branchlets twice as long as broad. Tubes 4. 
Conceptacles ovoid-globose, stalked, often secund ; tetraspores small. — P. 
