Polysiphonia .] 
IX. ALGJE. 
667 
0. Pectinate. Small, parasitic; primary stem creeping; pinna; vertical, 2-farious; 
articulations naked. Tubes 8-16. 
3. P. ceratoclada ; 4. P. Sulivance. 
y. PennaTjB. Stem erect or creeping, growing on rocks, distiehously or pinuately de- 
compound ; articulations naked (or coated with small cells). Tubes 5-16. 
5. P. pennata. 
§ II. Herposiphoma. — Usually small. Primary stem creeping, secondary erect, 
branched all round. Articulations naked. Tubes usually many. 
a. Obscure. Fronds small, forming spreading tufts. Primary stem creeping, branches 
erect. 
6. P. neglecia. 
13. Intricate. Fronds less tufted, creeping amongst other Alga or floating, intricate ; 
threads often rooting. 
7. P. implexa ; 8, macra ; 8, rudis ; 10, dumosa. 
§ III. Oligosiphonia. — Fronds large, branched on all sides ; articulations naked or 
coated with small cells. Tubes 4. 
a. UrceolatjE. Tufts stemless, erect ; branches and branchlets soft, flaccid, twiggy 
above; articulations naked (or the lower only coated with cells). 
11. P. strictissima ; 12, amphibia; 13, abscissa; 14, variabilis ; 15, nana ; 16, 
rhododactyla. 
13. Violacea:. Caulescent. Stem firmer, clothed with flaccid fascicled or penicillate 
branches ; lower or all the articulations coated with small cells. 
17. P- brachygona ; 18, Brodiai ? 
y. Hi’strices. Fronds subpinnately decompound; branches rather rigid, ultimate 
subulate or spinescent ; articulations coated with small cells. 
19. P. Lyallii. 
§ IV. Polysiphonia. — Fronds erect, branching all round ; articulations with 5 or more 
tubes, rarely coated with small cells (never in the N. Z. species). 
a. Atro-rubescentes. Fronds red-brown or purplish ; branches dichotomous, attenu- 
ated upwards. Tubes 9-14. 
20. P. corymb f era ; 21, comoides ; 22, isogona. 
/3. Bvssoidea:. Fronds pinnately decompound ; branches various, branchlets soft, of a 
single tube ; articulations. Tubes 7- 
23. P. australis. 
y. Cancellata;. Frond pinnately decompound ; branches all similar, or the shorter 
soft or spinescent ; articulations very soft. Tubes 7-10. 
24. P. decipiens ; 25, cancellata ; 26, aterrima ; 27, ramulosa. 
5. Nigrescentes. Frond subpinnately compound ; branches all similar, soft, twiggy. 
Tubes 12-20. 
28. P. nigrescens. 
1. P. Colemsoi, Eook.f. and Harv. FI. N. Z. ii. 229. t. cxii. C. (Frond 
erect, dark coloured when dry. Stem 1-2 in. long, stout; articulations 
everywhere pellucid, 4-angled, branched from every side ; branches alternately 
decompound, giving off simple and pinnate branchlets from each node ; 
articulations of 4 tubes, which are square in outline, their walls thick. Con- 
ceptacles on the larger branches, ovate-globose, pedicelled. — J. Ag. Sp. Alg. 
915. 
2x2 
