Chroodactylon Hansgirg, 1885

Lectotype species: Chroodactylon wolleanum Hansgirg

Original publication: Hansgirg, A. (1885). Ein Beitrag zur Kenntniss von der Verbreitung der Chromatophoren und Zellkernen bei den Schizophyceen (Phycochromaceen). Berichte der deutsche botanischen Gesellschaft 3: 14-22.

Type designated in: Drew, K.M. & Ross, R. (1965). Some generic names in the Bangiophycidae. Taxon 14: 93-99.

Description: False-branched pseudofilaments of globose or elliptical cells enclosed in a broad, gelatinous sheath and arranged in an irregular uniseriate manner. Each cell with a blue-green stellate, axial plastid and prominent pyrenoid. Cell diam. 3-16 µm, length 6-20 µm. Strong linear correlation between false branch number and filament length (ca. 1 branch per 200 µm length). Maximum filament length reported 1020 µm in Lake Ontario populations. Reproduction by monospores and fragmentation. No sexual reproduction observed.

Information contributed by: R.G. Sheath. The most recent alteration to this page was made on 2022-04-01 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 neuter.

Most recent taxonomic treatment adopted: Necchi, O., Jr. & Vis, M.L. (2021). Subphylum Cyanidiophytina, Class Cyanidiophyceae; Subphylum Proteorhodophytina, Classes Compsopogonophyceae, Porphyridiophyceae, Rhodellophyceae, and Stylonematophyceae. In: Freshwater red algae Phylogeny, taxonomy and biogeography. ( Eds), pp. 27-56. Cham: Springer [Springer Nature Switzerland AG].

Comments: Widespread epiphyte in temperate and tropical marine and freshwater environments. Freshwaters largely alkaline: specific conductance 170-540 mS cm-1 and pH 7.8-8.5. A marine isolate (Asterocytis ornata) changed from filamentous in full-strength seawater to unicellular or bicellular form closely resembling Chroothece in quarter-strength seawater. Population in Lake Huron (Asterocytis smarqdina) exhibited luxury storage of phosphorus, as indicated by polyphosphate body accumulation.

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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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.

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M.D. Guiry in Guiry, M.D. & Guiry, G.M. 01 April 2022. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 21 March 2023

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