Stenopeltis Itono & Yoshizaki, 1992

Holotype species: Stenopeltis gracilis (Yamada & Tanaka) Itono & Yoshizaki

Original publication and holotype designation: Itono, H. & Yoshizaki, M. (1992). Female reproductive morphology and taxonomy of Rhodpeltis (Polyidaceae, Rhodophyta). II. R. gracilis Yamada et tanaka, R. liagoroides Yamada and R. setchelliae Yamada. Reports of the Faculty of Science, Kagoshima University (Earth Science & Biology) 25: 137-147.

Description: Thallus upright, pale pink to red/orange, calcified, slightly lubricous, attached by a discoid holdfast, dichotomously branched. Axes terete to compressed (collapsing when dried and appearing flattened), with slight transverse striations. Structure multiaxial, with a central medulla of longitudinally aligned filaments giving rise to anticlinal, dichotomously to polychotomously divided assimilatory filaments that form a loose cortex; proximal cells of assimilatory filaments cylindrical, mid cells markedly inflated, several times the diameter of proximal cells; outer 2-4 cortical cells becoming narrower, with epidermal cells ellipsoid or clavate. Plants dioecious. Spermatangia arising singly or in pairs on spermatangial mother cells borne on outer cortical cells. Carpogonial branches 2-6 cells, borne laterally on inner cortical supporting cells, generally in sori. Unfertilized carpogonial branches cutting off a vegetative filament that arises from the hypogynous cell and grows through or closely associated with the carpogonium, if the former it eventually emerges from the carpogonium/trichogyne wall and forms a normal cortical filament. Post-fertilization carpogonium dividing transversely, with the upper daughter cell producing lateral, highly branched, gonimoblast filaments, these coursing through the cortical filaments. Outer cortical cells in the vicinity of the young carposporophyte resuming growth, forming unbranched or sparsely branched nemathecial filaments. Cells of the carpogonial branch and cortical filaments in the immediate vicinity producing post fertilization, horizontally spreading subsidiary filaments that can grow towards the surface and form paraphyses amongst the cystocarpic nemathecium. Mature cystocarp comprising a circular patch of paraphyses with intermingled, horizontally spreading, gonimoblast filaments, these producing anticlinal filaments with terminal, ellipsoid carposporangia. Tetrasporophyte and tetrasporangia unknown.

Information contributed by: John Huisman. The most recent alteration to this page was made on 2020-10-06 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: Huisman, J.M., Abbott, I.A. & Sherwood, A.R. (2004). Large subunit rDNA gene sequences and reproductive morphology reveal Stenopeltis to be a member of the Liagoraceae (Nemaliales, Rhodophyta), with a description of Akalaphycus gen. nov. European Journal of Phycology 39: 257-272.

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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=42988

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 06 October 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 04 December 2024