Rhododraparnaldia Sheath, Whittick & K.M.Cole, 1994

Holotype species: Rhododraparnaldia oregonica Sheath, Whittick & K.M.Cole

Original publication and holotype designation: Sheath, R.G., Whittick, A. & Cole, K.M. (1994). Rhododraparnaldia oregonica, a freshwater red algal genus and species intermediate between the Acrochaetiales and the Batrachospermales. Phycologia 33: 1-7.

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Description: Crimson-colored filaments up to 15 cm long with barrel-shaped axial cells which have a distinctly larger diam. (17.3-30 µm) than that of lateral branches (4.0-8.5 µm). Unique spermatangial stalks produce two types of spermatangia at their tips. Carpogonium is borne on an undifferentiated branch and has a swollen, cylindrical base and thin trichogyne. Carposporophyte spherical, compact mass of short gonimoblast filaments. Carposporangia spherical up to 8 &m in diam. Carpospores germinate into a chantransia (= pseudochantransia) phase with cells 5-7 x 16-38 µm; this phase produces gametophyte. DAPI relative fluorescence values twice as high for gonimoblast cells, carposporangia and chantransia cells as for the gametophyte vegetative cells and gametangia. Pit plugs have two cap layers, the outer one typically domed. Nuclei in early mitotic prophase have one layer of perinuclear ER, a single-layered polar ring and chromatin associated with the nucleolus.

Information contributed by: R.G. Sheath & Vis & Necchi (2021: 108). The most recent alteration to this page was made on 2022-04-12 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: Vis, M.L. & Necchi, O., Jr. (2021). Subphylum Eurhodophytina, Class Florideophyceae, Subclass Nemaliophycidae, Order Batrachospermales. In: Freshwater red algae Phylogeny, taxonomy and biogeography. ( Eds), pp. 95-128. Cham: Springer [Springer Nature Switzerland AG].

Comments: Found in two mountain streams in Oregon (U.S.A.); the type locality has moderate current velocity (35-61 cm s-1), temperatures 8-11%C, pH 8.3 and specific conductance 30 &S cm-1.

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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=42908

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 12 April 2022. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 29 March 2024

 
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