Hildenbrandia Nardo, 1834, nom. cons.

Holotype species: Hildenbrandia prototypus Nardo

Currently accepted name for the type species: Hildenbrandia rubra (Sommerfelt) Meneghini

Original publication and holotype designation: Nardo, G.D. (1834). De novo genere Algarum cui nomen est Hildbrandtia prototypus. Isis von Oken 1834: 675-676.

Request PDF

Description: Thallus prostrate, forming a crust on rock. Initially forming a thin crust but can become leathery with age. Lower surface fully adherent to substratum. Rhizoids lacking. Basal layer of filaments giving rise to crowded, closely coherent vertical filaments that are sparsely branched. Horizontal stratification sometimes apparent. Adjacent cells joined to one another by secondary pit connections formed without conjunctor cells. Cells cylindrical, varying little in diameter, ca. 5 µm. Thallus surface smooth and firm. Cells uninucleate. Chloroplast single per cell. Pit plugs with a cap membrane, but lacking outer cap layer. Gametangia unknown. Tetrasporangia formed in pit-like conceptacles scattered over the thallus surface. Conceptacles spherical or cylindrical with an ostiole, or an open cavity. Tetrasporangia formed on floor and sides of conceptacles. Conceptacles enlarged by repeated rounds of conversion of vegetative cells lining conceptacle chamber into tetrasporangia. Tetrasporangia fundamentally zonately divided, with parallel transverse cleavage or parallel oblique cleavage or non-parallel oblique cleavage. Walls of discharged tetrasporangia often persistent. Paraphyses absent.

Information contributed by: C.M. Pueschel & M.D. Guiry. The most recent alteration to this page was made on 2022-04-08 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Gender: This genus name is currently treated as feminine.

Most recent taxonomic treatment adopted: Kylin, H. (1956). Die Gattungen der Rhodophyceen. pp. i-xv, 1-673, 458 figs. Lund: C.W.K. Gleerups.

Comments: Fungal hyphae commonly present in walls and conceptacles, especially in high intertidal thalli. Freshwater species reproducing by vegetative propagules rather than spores. A predominantly marine genus, but with a widely distributed freshwater species. Marine species found in tropical, temperate, and subpolar waters and ranging from high intertidal to subtidal zones. Reproduction in freshwater populations exclusively vegetative via fragments, offshoots, and gemmae. There are three (and perhaps four) freshwater species.

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

Contributors
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.

Linking to this page: https://www.algaebase.org/search/genus/detail/?genus_id=22

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 08 April 2022. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 23 November 2024