Art. XLI.—Revised List of New Zealand Seaweeds.

Transactions and Proceedings of the Royal Society of New Zealand, Volume 37, 1904, Page 380

Art. XLI.—Revised List of New Zealand Seaweeds. By R. M. Laing, B.Sc. [Read before the Philosophical Institute of Canterbury, 2nd November, 1904.] Appendix I. I INTEND from time to time, as opportunity offers, adding to my list of New Zealand seaweeds, in order to keep it as far as possible up to date. I shall not amend the original list except where it is obviously wrong. The appendices, therefore, will include only such species as have been found since the original list was published, or such old species as have been found by the early voyagers and rejected by Agardh, but rediscovered and identified by later investigators. Most of the species in this paper have been identified by Major Reinbold, of Itzehoe, and I have again to thank him for his unfailing kindness to me. Subclass Chlorophyceæ. 390. Ostreobium reineckei, Born. (“Flora of the Samoan Islands,” by Reinecke, in Engler's Bot. Jahrbuch, 1896.) This is the first shell-perforating alga to be recorded from New Zealand. No doubt others will be found when looked for.

The disappearance of shells from beaches is often to a considerable extent due to the action of these algæ. The shells from which this species was obtained were picked up out of the mud at Diamond Harbour, Lyttelton. Reinbold states that they also contained a plant closely resembling Gomontia polyrhiza, but, as the material was sterile, this determination is not certain. Order Cladophoraceæ. 391. Cladophora simpliciuscula, Kg., Phyc. Gener., p. 262 (= C. subsimplex, Kg., Tab. Phyc.). St. St. Clair: R. M. L. 392. Rhizoclonium africanum, Kg. (? R. ambiguum, Hook.). Mouth of Kaikorai Stream, Otago: R. M. L. Order Ulvaceæ. 393. Enteromorpha flexuosa, J. Ag. (Small form.) Mouth of Waimakariri: R. M. L. 394. Enteromorpha torta, Rbd. (= E. percussa, Harv., partim). Mouth of Kaikorai Stream, Otago: R. M. L. Subclass Phæophyceæ. Order Dictyotaceæ. 395. Dictyota dichotoma, Lmrx., var. implexa. Stewart Island: R. M. L. Subclass Florideæ. Order Ceramiaceæ. 396. Antithamnion termfolium, Hook, and Harv., Lond. Journ., iv., p. 272. North Mole, Timaru: R. M. L. Of my specimens Major Reinbold says, “More robust and more richly ramified than the type” (Flor. Antarct., pl. 189, fig. 2). If the plant does not belong to this species, it is at least very near to it. 397. Ptilothamnion schmitzii, Heydrich, Berichte der deutschen botanischen Gesellschaft, vol. xi., 1893. Bay of Islands: Heydrich. 398. Spongoclomum pastorale, R. M. L., Trans. N.Z. Inst., 1904. Wycliffe Bay, Otago Peninsula: R. M. L. 399. Ceramium discorticatum, Heydrich, loc. cit. Bay of Islands: Heydrich. 400. Ceramium laingii, Rbd. MS. (sp. nov.). On Codium mucronatum, Riverton: R. M. L. The following is Reinbold's description of the species: “Minutum (5–10 mm. altum) sed admodum crassum, continue

corticatum (articulis perbrevibus vix dignoscendis) superne dense lateraliter ramosum, fronde inferne indivisa, ramulis prolificantibus vestita, ramis valde decompositis, ramulis corymbosa—subfastigiatis apicibus strictis vel (plerumque) divaricatis, acutis, sphaerosporis in ramulis unilateraliter margine quasi immersis et leviter protuberantibus, series longitudinales for mantibus.” In habit the species is near to C. pusillum, from which it is sharply differentiated by the position of the tetraspores. The tetraspores of C. pusillum are verticillate and immersed round the nodes. Order Cryptonemiaceæ. 401. Thamnoclonium daviferum, J. Ag., Epic. Florid., p. 168. (= T. hirsutum, Harv., Phyc. Austr., tab. 293). Foveaux Strait: R. M. L. Order Gigartinaceæ. 402. Dicranema grevillei, Lond. Bot. Zeit., 1845, p. 56. (J. Ag., Epic. Florid., p. 435.) Foveaux Strait: R. M. L. 403. Callocolax neglectus, Schmitz. (Batters, in “Annals of Botany,” vol. ix., June, 1895.) On Callophyllis hombroniana, Timaru: R. M. L. This plant is probably sufficiently close to the English and Continental species to be identified with it. Order Areschougiaceæ. 404. Thysanocladia laxa, J. Ag., Epic., p. 288. Foveaux Strait: R. M. L. 405. Areschougia laurencia, Hook. and Harv., Lond. Journ., vi., p. 409. (J. Ag., Epic. Florid., p. 282.) Foveaux Strait: R. M. L. Order Rhodymeniaceæ. 406. Plocamium hookeri, Harv., Alg. Ant., p. 9. (J. Ag., Epic., p. 337.) Macquarie Islands: A. Hamilton ! 407. Plocamium procerum, J. Ag., Epic. Florid., p. 247. Foveaux Strait: R. M. L. This plant is possibly included in P. corallorhiza, Fl. Nov. Zel. 408. Phacelocarpus alatus, J. Ag., Epic., p. 399. Foveaux Strait (?): R. M. L. 409. Curdiæa engelharti, J. Ag., Spec. Alg., vol. iii., part 4, p. 105. In large quantities at Akatore, on the coast of Otago, but seen nowhere else: R. M. L.

410. Gracilaria lichenoides, J. Ag., Spec. Alg., vol. iii., part 4, p. 52. New Zealand: Agardh. 411. Gracilaria harveyana (?), J. Ag., Spec. Alg., vol. iii., part 4, p. 65. New Zealand: Agardh. Order Delesserieæ. 412. Nitophyllum parvifolium (?), J. Ag. St. Clair: R. M. L. Order Gelidiaceæ. 413. Gelidium intricatum (Kg.), Grunow. New Zealand (the exact locality has been lost): R. M. L. Order Rhodomeleaceæ. 414. Bostrychia similis, Rbd., spec. nova. Half-moon Bay, Stewart Island: R. M. L. The following is Reinbold's description: “Bostrychia minuta (usque 15 mm. alta) capillaris, tota corticata, a surculis repentibus et radicantibus intricatis erectiuscula, parce late-raliter (vel subdichotome) ramosa; ramis elongatis (junioribus leviter incurvis adultioribus strictis) hic illic apice furcatis, subacutis, raro ramulis obsessis, stichidis ovali-lanceolatis longe pedicellatis acumine sterili superatis; siphonibus 7 (inferiore parte) substantia admodum rigida. Chartae vix adhaeret.” “As to the habit our plant resembles in some degree B. simpliciuscula, B. intricata, and B. vaga; but the fronds of the two former species are articulated, not corticated; besides, in B. simpliciuscula the rooting apparatus is turned in a peculiar manner. B. vaga is amidst all Bostrychias sharply characterized by the simple much curved (adult) branches, which are evidently (even for the naked eye) incrassated above the middle. Besides, the cortication of B. vaga is less dense than that of our plant.”—(Reinbold, in letter to Author.) 415. Rhodomela hookeriana, J. Ag., Spec. Alg., vol. iii., part 2. p. 881. The Bluff: R. M. L. Order Helminthocladiaceæ. 416. Chantransia polyrhiza (= Callithamnion polyrhiza, Harv.). Riverton: R. M. L. 417. Chantransia interposita, Heydrich, Deutschen botanischen Gesellschaft, 1893 (? = C. naumauni, Asken). On Codium, Bay of Islands: Heydrich.

Order Corallineæ. 418. Melobesia carpophylli, Heydrich, Deutschen botanischen Gesellschaft, 1893. Bay of Islands: Heydrich. 419. Lithophyllum (Melobesia) antarctica, Hook. and Harv., Fl. Ant., p. 482. Riverton: R. M. L.