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Dictyota Lamour.
The genus in N.Z. requires re-investigation together with the introduction of unidentified and undescribed species.
Dictyota dichotoma (Huds.) Lmx. (1813), p. 58; V. W. L. (1946), VII, No. 160.
On Carpophyllum maschalocarpum, but may also be saxicolous.
Loc. distr.: Bay of Islands, and here and there along the coasts in more or less sheltered situations. Mostly summer.
Geogr. distr.: Almost cosmopolitan.
†var. intricata (Ag.) Grev. (1830), p. 58 [=var. implexa (Desf.) S. F. Gray]; Papenf. (1944), p. 338.
Very narrow and twisted, tangled and much branched; on rock or Corallines at low-water or in pools in sheltered positions, often in somewhat muddy localities. Spring and autumn.
Loc. distr.: North Auckland to Stewart Is.; very local.
Geogr. distr.: Probably widespread; England, Mediterranean, New Zealand.
Dictyota ocellata J. Ag. (1894), p. 68; V. W. L. (1941), V, No. 111.
A much larger and coarser plant than the preceding, but small specimens are almost identical with D. dichotoma. In channels and pools on semi-exposed beaches. Winter, spring, summer.
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Loc. distr.: From the Far North southwards, locally common.
Geogr. distr.: Tasmania, Australia, N.Z.
Dictyota prolificans A. et E. S. Gepp (1906), p. 250.
Surface of frond covered with small, dense, and crowded hairs; the stipe is not stupose, and the holdfast consists of long, simple, thread-like fibres.
Loc. distr.: Kermadecs. Not recorded so far from the mainland.
Geogr. distr.: Australia, Kermadecs.
Type loc.: N.S.W.
*Dictyota radicans Harv. (1859), Pl. 119; V. W. L. (1946), X, No. 233.
Plant somewhat papery, axils of branches narrow, tips often pointed and crossed. This is the only species on the New Zealand mainland in which the holdfast consists of thread-like fibres which may be very conspicuous and long.
Loc. distr.: Pihama, Taranaki (V. W. L.), in drift. Feb. and March.
Geogr. distr.: Tropical Australia, W. and S. Australia, Tongatabu, N.Z.
Type loc.: Australia.
*Dictyota sp.; V. W. L. (1946), VIII, No. 187, as D. papenfussii Lindr. sp. ined.
Distinct from all other New Zealand species in having alternate branches narrower than the rachides, which are spirally twisted, and in the lower branches being basally stupose. Jan. to May.
Loc. distr.: Pihama, Taranaki (V. W. L.).
Geogr. distr.: N.S.W. (Valerie May); N.Z.