Electronic Flora of South Australia Family Fact Sheet

FAMILY GELIDIACEAE Kützing 1843: 390, 405

Phylum Rhodophyta – Class Florideophyceae – Order Gelidiales

With the characters of the order and including the family Gelidiellaceae Fan (1961, p. 317).


FAN, K.C. (1961). Morphological studies of the Gélidiales. Univ. Calif. Pubis Bot. 32, 315–368.

KÜTZING, F.T. (1843). Phycologia generalis. (Leipzig.)

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

Author: H.B.S. Womersley & M.D. Guiry

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.


1. Thallus lacking rhizines (rarely very few in the holdfast or lower axes)


2. Ramuli proliferous from the surface of the thallus; inner cortex of large parenchymatous cells


2. Ramuli or branchlets arising from the margins of the thallus; inner cortex of relatively small cells


3. Generations heteromorphic, thallus mat-like with branches decumbent to more or less erect; tetrasporangia in rows of similar age; female gametophytes producing carpogonia which when fertilized form tetrasporophytes directly (without carposporophytes)


3. Generations isomorphic, largely erect; tetrasporangia usually scattered and of various ages; female gametophytes producing carposporophytes in cystocarps


4. Cystocarps bilocular, with a central placenta and one or more small ostioles on each surface; carposporangia single, terminal; apical cell usually slightly protruding


4. Cystocarps unilocular (rarely unequally bilocular), with a basal placenta and ostiole(s) on only one surface; carposporangia in short chains; apical cell usually in a slight notch


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