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Electronic Flora of South Australia Genus Fact Sheet

Genus NEMALION Duby 1830: 959

Phylum Rhodophyta – Class Florideophyceae – Order Nemaliales – Family Liagoraceae

Thallus (gametophyte) erect, subterete, simple to subdichotomously branched, sometimes with laterals, multiaxial with a medulla of slender filaments, irregularly entwined, and a cortex of anticlinal filaments differentiated into an inner colourless region and outer assimilatory region, cells with axile, stellate rhodoplasts, each with a central pyrenoid; tetrasporophyte minute, filamentous, branched.

Reproduction: Carpogonial branches usually 4–8-celled, linear, comparable to young cortical filaments. First zygote division transverse, the upper cell segmenting obliquely or longitudinally to form a dense, globular carposporophyte. Sterile post-fertilization filaments usually present, developing from lower cells of carpogonial branch, forming a slight involucre around the carposporophyte. Spermatangia lateral or in digitate clusters on outer cortical cells.

Tetrasporophytes reproducing by monospores and cruciately divided tetrasporangia (Chen et al. 1978).

Life history triphasic with heteromorphic gametophyte and tetrasporophyte (Chen et al. 1978).

Type species: N. lubricum Duby 1830: 959 [= N. helminthoides (Velley) Batters].

References:

CHEN, L.C.M., EDELSTEIN, T., BIRD, C. & YABU, H. (1978). A culture and cytological study of the life history of Nemalion helminthoides (Rhodophyta, Nemaliales). Proc. N. S. Inst. Sci. 28, 191–199.

DUBY, J.E. (1830). Botanicon Gallicum seu Synopsis Plantarum in Flora Gallica Descriptarum. Part 2, Plantas Cellulares continens. Edn 2. (Paris.)

The Marine Benthic Flora of Southern Australia Part IIIA complete list of references.

Author: H.B.S. Womersley

Publication: Womersley, H.B.S. (14 January, 1994)
The Marine Benthic Flora of Southern Australia
Rhodophyta. Part IIIA, Bangiophyceae and Florideophyceae (to Gigartinales)
Reproduced with permission from The Marine Benthic Flora of Southern Australia Part IIIA 1994, by H.B.S. Womersley. Australian Biological Resources Study, Canberra. Copyright Commonwealth of Australia.


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