Nothocladus Skuja, 1934
Lectotype species: Nothocladus nodosus Skuja
Original publication:Skuja, H. (1934). Untersuchungen über die Rhodophyceen des Sußwassers. Beihefte zum Botanische Centralblatt 52: 173-192.
Type designated in Kylin, H. (1956). Die Gattungen der Rhodophyceen. pp. i-xv, 1-673, 458 figs. Lund: C.W.K. Gleerups.
Taxonomic status: currently recognized as a distinct genus.
Most recent taxonomic treatment adopted: Schneider, C.W. & Wynne, M.J. (2007). A synoptic review of the classification of red algal genera a half a century after Kylin's "Die Gattungen der Rhodophyceen". Botanica Marina 50: 197-249.
Description: Branched, cylindrical thallus, gelatinous or cartilaginous, olive to brown-velvet to black, up to 11 cm long and 100-1000 µm diam. Central, uniseriate axis covered by several layers of medullary filaments and densely branched cortical fascicles of limited growth. Spermatangia globular, 2-4 µm diam. Carpogonial branches somewhat twisted and arising from proximal fascicle cells, forming symmetrical carpogonia with long, clavate trichogynes. Carposporophyte of indeterminate branching filaments arising from dense, primary gonimoblast and terminating in large elliptical carposporangia. Chantransia stage not observed. Ultrastructure of N. lindaueri well studied. Pit plugs typical batrachospermalean with 2 cap layers, the outer one of which is domed. Hair cells have a basal collar, single nucleus and abundant Golgi bodies, endoplasmic reticula (ER) and vesicles. Dividing apical cells of fascicles have a zone of exclusion containing a single polar ring adjacent to nucleus. Carpogonial branch and involucral cells contain a prominent axial nucleus, proplastids, ER and vesicles. Pit plugs disintegrate among these cells. Carpogonia have plentiful mitochondria and vesicles. Wall at trichogyne apex thickened and densely stained. Carposporophyte centre consists of mass of fusion cells. Emend. Entwisle & M.L.Vis (2016: 389).
Information contributed by: R.G. Sheath. The most recent alteration to this page was made on 8 Jul 2016 by Wendy Guiry.
Comments: Occurs in freshwater streams in New Zealand, Australia and Madagascar. N. nodosus and N. lindaueri, often in close association in southeast Australia, late summer to autumn, large and open rivers, temperature 6-19°C, pH 6.4-8.0 and specific conductance 82-109 µS cm-1. Considered to be a Section of Batrachospermum by Necchi & Entwisle (1990).
Numbers of names and species: There are 20 species names in the database at present, as well as 1 infraspecific names. Of the species names, 17 have been flagged as accepted taxonomically on the basis of the listed literature under the species name. In some instances, opinions on taxonomic validity differ from author to author and users are encouraged to form their own opinion. AlgaeBase is a work in progress and should not be regarded as a definitive source only as a guide to the literature..
Names: ('C' indicates a name that is accepted taxonomically; 'S' a homotypic or heterotypic synonym; 'U' indicates a name of uncertain taxonomic status, but which has been subjected to some verification nomenclaturally; 'P' indicates a preliminary AlgaeBase entry that has not been subjected to any kind of verification. For more information on a species click on it to activate a link to the Species database):
Click here to also show infraspecific names in the list below.
Entwisle, T.J., Johnston, E.T., Lam, D.W., Stewart, S.A. & Vis, M.L. (2016). Nocturama gen. nov., Nothocladus s. lat. and other taxonomic novelties resulting from the further resolution of paraphyly in Australasian members of Batrachospermum (Batrachospermales, Rhodophyta). Journal of Phycology 52(3): 384-396.
Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.
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.
Created: 28 December 2000 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=42772
Please cite this record as:
Guiry, M.D. & Guiry, G.M. 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 17 January 2020.