162,398 species and infraspecific names are in the database, 22,760 images, 63,992 bibliographic items, 474,947 distributional records.

Ceratodictyon Zanardini, 1878

Empire Eukaryota
Kingdom Plantae
Subkingdom Biliphyta
Phylum Rhodophyta
Subphylum Eurhodophytina
Class Florideophyceae
Subclass Rhodymeniophycidae
Order Rhodymeniales
Family Lomentariaceae

Holotype species: Ceratodictyon spongiosum Zanardini

Original publication and holotype designation: Zanardini, G. (1878). Phyceae papuanae novae vel minus cognitae a cl. O. Beccari in itinere ad Novam Guineam annis 1872-75 collectae. Nuovo Giornale Botanico Italiano 10: 34-40, no figs.
 Download PDF

Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Schneider, C.W. & Wynne, M.J. (2007). A synoptic review of the classification of red algal genera a half a century after Kylin's "Die Gattungen der Rhodophyceen". Botanica Marina 50: 197-249.

Nomenclatural notes
Monotypic when first introduced. - (24 Jan 2017) - M.D. Guiry

Taxonomic notes
The taxonomic placement of Gelidiopsis and its relation to Ceratodictyon are discussed by Silva et al. (1996: 355). - (4 Jun 2010) - Wendy Guiry

Description: Thallus living in symbiotic association with the sponge Sigmadocia symbiotica, forming irregular cushions or hummocks of recumbent, often imbricate axes composed of subcylindrical to compressed, subdichotomous to irregularly branched intertwining fronds anastomosing to form a dense reticulum, interstices of alga filled to a greater or lesser extent with sponge tissue. Construction multiaxial, cortex composed of a single layer of cuboidal or rectilinear cells subtended by progressively larger, increasingly elongate cells linked by numerous pit connections. Medulla composed of loosely aggregated elongated filaments in a weak gelatinous matrix, filaments bearing occasional single secretory cells. Algal and sponge partners reproduce independently. Algal reproductive structures on modified terminal branches projecting from the tips of the reticulate matrix or laterally at sites of apparent damage by wounding or abrasion. Gametangial plants dioecious; spermatangia in swollen exerted gelatinous axes, formed from spermatangial initials produced from cortical cells, each cutting off one or two spermatangia distally, sometimes in chains of two. Procarpic, carpogonial branches 3-celled, borne on a slightly enlarged supporting cell with a 2-celled auxiliary cell branch, initial division of the zygote oblique or nearly longitudinal, gonimoblast developing outwards from a fusion cell persisting in the mature cystocarp as a large columnar structure; cystocarps in aggregates on branched fertile axes, ostiolate, never coronate, strongly protruding outwards, most cells forming carposporangia synchronously in a single gonimolobe, tela arachnoidea absent. Tetrasporangia in terminal nemathecia completely encircling the terete unbranched fertile axes, initials formed terminally in a lateral position. Spores regularly or irregularly cruciately arranged.

Information contributed by: M.D. Guiry. The most recent alteration to this page was made on 27 Sep 2018 by M.D. Guiry.

Numbers of names and species: There are 9 species names in the database at present, of which 9 have been flagged as accepted taxonomically on the basis of the listed literature under the species name. In some instances, opinions on taxonomic validity differ from author to author and users are encouraged to form their own opinion. AlgaeBase is a work in progress and should not be regarded as a definitive source only as a guide to the literature..

Names: ('C' indicates a name that is accepted taxonomically; 'S' a homotypic or heterotypic synonym; 'U' indicates a name of uncertain taxonomic status, but which has been subjected to some verification nomenclaturally; 'P' indicates a preliminary AlgaeBase entry that has not been subjected to any kind of verification. For more information on a species click on it to activate a link to the Species database):

Click here to also show infraspecific names in the list below.

Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.

Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in CD format. These AlgaeBase descriptions are now being continually updated, and each current contributor is identified above. The PSA and AlgaeBase warmly acknowledge the generosity of all past and present contributors and particularly the work of Dr Parker.

Descriptions of chrysophyte genera were subsequently published in J. Kristiansen & H.R. Preisig (eds.). 2001. Encyclopedia of Chrysophyte Genera. Bibliotheca Phycologica 110: 1-260.

Created: 01 January 2001 by M.D. Guiry

Verified by: 24 January 2017 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=40126

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 27 July 2021.

SITE © 1996 - 2021 M.D. Guiry. All rights reserved.

Website Design : 249 Design Studio