Lectotype species: Entonema penetrans Reinsch
Original publication:Reinsch, P.F. (1875 '1874/75'). Contributiones ad algologiam et fungologiam. Vol. 1 pp. [i]-xii, -103, [104, err.], 131 plates [I-III, IIIa, IV-VI, VIa, VII-XII, XIIa, XIII-XX, XXa, XXI-XXXV, XXXVa, XXXVI (Melanophyceae); I-XLII, XLIIa, XLIII-XLVII, XLVIIa, XLVIII-LXI (Rhodophyceae); I-XVIII (Chlorophyllophyceae); I-IX (Fungi)]. Norimbergae [Nürnberg]: Typis Theodor Haesslein.
Type designated in Kylin, H. (1947). Die Phaeophyceen der schwedischen Westküste. Acta Universitatis Lundensis 43(4): 1-99, 61 figs, 18 pls.
Taxonomic status: currently recognized as a distinct genus.
Most recent taxonomic treatment adopted: Silberfeld, T., Rousseau, F. & Reviers, B. de (2014). An updated classification of brown algae (Ochrophyta, Phaeophyceae). Cryptogamie Algologie 35(2): 117-156.
Description: Plants referred to this genus are endophytic and consist of branched filaments creeping in the cell walls of various red and/or brown algae. The filaments may form a syntagma and then the plant becomes a monostromatic disc. Much confusion has arisen about this genus. There is no doubt that Reinsch also has included some green algae, for example Entonema heteromorphum Reinsch and E. pycnomonae Reinsch. In the literature there has been various concepts of the genus. Hamel (1939) used the name for plants with an endophytic prostrate system with well-developed erect filaments and included for example Entonema clandestinum (Cronan frat.) Hamel, today considered as belonging to Elachista. Kylin (1947) considered Entonema penetrans Reinsch as being the typical Entonema and this species is listed as the lectotype in Farr and others (1979). Plants composed of endophytic, irregularly branched filaments, but without erect filaments, could according to Kylin be accommodated in Entonema. However, with regard to one character, the latter author is self-contradictory. Reinsch (1875, tab. 1, right figure) has clearly illustrated erect filaments from the endophytic part. These filaments are presumably not in the process of being transformed into plurilocular sporangia. There is no doubt that many plants referred to Entonema are microthalli of well-known macrothalli, others can be referred to e.g. Streblonema. Entonema must be considered a poly- and paraphyletic genus with uncertain taxonomic position as a consequence.
Information contributed by: P. M. Pedersen. The most recent alteration to this page was made on 20 Jun 2014 by M.D. Guiry.
Numbers of names and species: There are 29 species names in the database at present, as well as 3 infraspecific names. Of the species names, 4 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.
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
Verified by: 20 June 2014 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=42694
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 18 May 2021.