Helminthocladia kempii Popolizio, C.W.Schneider & Chengsupanimit 2013

Publication Details
Helminthocladia kempii Popolizio, C.W.Schneider & Chengsupanimit 2013: 239, figs 2-11

Published in: Popolizio, T.R., Schneider, C.W., Chengsupanimit, T., Saunders, G.W. & Lane, C.E. (2013). Notes on the marine algae of the Bermudas. 13. Helminthocladia kempii sp. nov. (Nemaliales, Liagoraceae) based upon H. calvadosii sensu auct. from western Atlantic. Cryptogamie Algologie 34: 22-244, 11 figs, 2 tables.

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Type Species
The type species (holotype) of the genus Helminthocladia is Helminthocladia purpurea (Harvey) J.Agardh.

Status of Name
This name is of an entity that is currently accepted taxonomically.

Type Information
Type locality: "cove immediately east of Spanish Point Park, Bermuda Is., Bermuda (32 18 25.5N, 64 48 48.6W)"; (Popolizio & al. 2013: 239) Holotype: C.W. Schneider 12-10-14; 18.i.2012; 0-1 m on rock; MICH; (Popolizio & al. 2013: 239)

General Environment
This is a marine species.

Description
Plants reddish-brown in color, erect, arising from a simple discoidal holdfast, to 19 cm tall; axes mucilaginous, smooth and slippery but firm, and subdichotomously branched; main axes 0.5-2.5 mm in diameter, typically overwhelmed by short, irregularly disposed adventitious lateral branches, some of these remaining undeveloped and dichotomous, whereas others become additional leading axes; cortical assimilatory filaments branched into fan-like clusters, 3-6 cells from base to apex, and to 230 µm in length; basal cortical cells 7-10 µm in diameter and 18-35 µm long with shorter subterminal cells 12-15 µm diameter and 15-22 µm long, and apical cells 10-20 µm in diameter and 20-35 µm long; medullary axes composed of filaments with cells 11-27 µm in diameter and 70-175 µm long; gametophytes dioecious, spermatangial clusters paniculate with globose spermatangia 2-5 µm in diameter; carpogonial branches consisting of 3-4 cells, 7.5-10.0 µm in diameter and 30-38 µm long; first division of the carpogonium transverse or obliquely transverse after fertilization and following excision of the trichogyne; gonimoblast filaments issued from divided carpogonium cells, comprised of cells 3.5-4.5 µm in diameter and 7.0-9.0 µm long, producing carposporangia 3.0-5.0 µm in diameter and 7.0-9.0 µm long; few sterile post-fertilization cells present, arising from the supra- and infra-supporting cells adjacent to the carpogonial branch, and wrapping around the carpogonial branches; a weak involucre of elongate sterile filaments forming around the carposporophytes produced from adjacent cortical cells of the same assimilatory fascicle.

Created: 19 December 2013 by M.D. Guiry.

Last updated: 05 October 2015

Verification of Data
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Linking to this page: https://www.algaebase.org/search/species/detail/?species_id=148040

Citing AlgaeBase
Cite this record as:
Craig Schneider in Guiry, M.D. & Guiry, G.M. 05 October 2015. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 02 October 2022

 
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