632 
IX. ALGA5. 
[Delesseria. 
§ 1 . Frond dichotomously branched. 
1. D. Hookeri, Lyall in FI. N. Z. ii. 238. t. 114, 115. Proud 2 ft. 
and more long, stipitate, 4-5 in. broad, linear or ovate-lanceolate, or oblong- 
obovate, lacerate, acute or subacute, crimson-purple, sometimes palm atiiid ; 
substance thick, surface-cells small ; costa stout, pinnated at distances of ^ in. ; 
nerves thick, erecto-patent, dichotomous ; margin erose-toothed. Concep- 
tacles on obovate processes, 1 1 2 — in. long on the veins ; walls thick ; orifice 
prominent. Tetraspores in oblong minute sori near the base of the lamina. 
Lyall’s Bay or Cook’s Straits, Foveaux Straits and Otago, Lyall. — The finest species of 
the genus. 
2. D. dichotoma, Hook.f. and Harv. FI. N. Z. ii. 239. Prond mem- 
branous, rose-purple or blood-red, 4-8 in. high, stipitate ; stipes 2-3 in. long, 
oblong-cuneate or elliptic-lanceolate, obtuse or emarginate, at length 2-fid or 
laciniate ; costa stout, dichotomous, vanishing below the apex. Sori rounded. 
— PI. Antarct. 185. t. 71. f. 2 ; Harv. Ner. Austr. 115 ; J. Ag. Sp. Alg. ii. 
682. 
Ruapuke and Chalky Bay, Lyall. Lord Auckland’s group and Campbell’s Island, 
J.D.E. 
3. D. pleurospora, Harv. in FI. N. Z. ii. 239. Prond 6-8 in. high, 
stipitate, flabellate, laciniate ; segments dichotomous, cuneate, alternate, acute 
or subobtuse, spreading ; margin quite entire ; costa dichotomous, vanishing 
below the tips of the segments. Sori linear, arranged in confluent lines on 
each side of the costa. 
Preservation Harbour, Lyall. — Possibly a form of D. dichotoma, hut the sori appear very 
different. 
4. D. Leprieurii, Mont. ; — FI. N. Z. ii. 240. Fronds rising from a 
creeping rhizome, dichotomous or subfastigiate, dull violet-purple, 1-3 in. 
long, costate, constricted at the axils as if articulate ; segments linear-lanceo- 
late, acute at both ends. Tetraspores in lines radiating from the costa to the 
margin, on the terminal segments and on axillary leaflets. — Montagne in Ann. 
Sc. Nat. ser. 3. xiii. 196. t. 5. f. 1 ; J. Ag. Sp. Alg. ii. 682. 
Bay of Islands, J. I). H. (Guiana, U. States.) — A very curious plant, doubtfully referred 
to Delesseria by Harvey, more coufidently by J. Agardh. 
§ 2. Frond pinnately decompound ; segments of the primary first pinnatifid and then 
pinnate. 
5. D. quercifolia, Bory ; — FI. N. Z. ii. 239. Prond pale red-purple, 
3-6 in. long, broadly ovate, pinnatifid and 2-pinnatifid, irregularly lobed, 
sinuate and toothed ; costa stout, giving off opposite nerves to the tips of the 
lobes. Sori minute, punctiform, Very numerous between the nerves on the 
lobes. — Borv in Duperr. Voy. Bot. 186. t. 18. f. 1; Harv. Ner. Austr. 114. t. 46; 
J. Alg. Sp. Alg. ii. 692. 
East coast, lat. 42°, Lyall. (Fuegia, Falkland Islands.) 
6. D. Davisii, Hook. f. and Harv. FI. JV. Z. ii. 239. Prond with a 
winged cartilaginous stipes, 5-7 in. long, rose-red, membranous, pinnate or 
pinnatifid; segments obliquely lanceolate, costate, feather-nerved, nerves 
