Species of Plocamium on the South African Coast

Simons, R. H.

doi:10.4102/abc.v8i2.1630

Cited by 16 publications

(13 citation statements)

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“…Among the works that do not specifically study Namibia, some that deal with South African marine algae produce species descriptions that were partly taken from the observation of material collected in Namibia. Such is the case of Silva (1959), Simons (1964Simons ( , 1966Simons ( and 1970 and Simons and Hewitt (1976). In the same way, species descriptions partly based on material from Namibia can be found in the works that comprise a broader study area, such as the tropical Atlantic (Silva, 1960) or the southern hemisphere (Searles, 1968).…”

Section: Historical Backgroundmentioning

confidence: 99%

“…Order PLOCAMIALES Saunders and Kraft (1994) Family PLOCAMIACEAE Kützing (1843) Genus Plocamium Lamouroux (1813) Dixon and Irvine (1977), Lawson and John (1987), Womersley (1994) and Coppejans (1995); concerning the remaining taxa see Simons (1964) and . Reproduction: Tetrasporangia zonate, ellipsoid or more or less cylindrical, 56-100 x 32-72 μm, placed in two rows in the upper part of fertile branchlets occurring adaxially in the laterals; fertile branchlets cylindrical, up to 1600 μm long and 120-140 μm in diameter, fairly branched and more or less entangled; tetraspores often several times divided inside the tetrasporangia.…”

Section: (Map 42)mentioning

confidence: 99%

“…On the other hand, Baardseth (1941) described P. fuscorubrum from Tristan da Cunha and remarked that this species is similar to P. glomeratum, from which it differs in being essentially taller and in having broader and coarser fertile branchlets. References: Kylin (1938), Simons (1964Simons ( , 1969Simons ( , 1976, Branch and Branch (1981), .…”

Section: (Map 42)mentioning

confidence: 99%

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Marine benthic algae of Namibia

Lluch

2002

Sci. Mar.

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SUMMARY: The first comprehensive study of the marine algal flora of Namibia including descriptions and illustrations of most species is presented. The main objective of this work is to report a flora that, until now, has scarcely been studied. The work compiles all the available information on the marine benthic flora of Namibia and provides new data about it composition and biogeography, as well as detailed descriptions and remarks of most of its species. The samples on which this study is based were collected between 1986 and 1989 in the eulittoral and the upper sublittoral zones of the north half of the Namibian coast. According to the present data, the marine benthic flora of Namibia comprises 196 taxa (147 Rhodophyceae, 20 Phaeophyceae, 15 Ulvophyceae, 6 Cladophorophyceae and 8 Bryopsidophyceae), 21 of which has not been recorded from this coasts. This temperate flora is mainly characterized by a low number of species, a low proportion of Phaeophyceae and a high degree of endemism. Concerning the species number, the flora is quite poor due to both the scarce availability of colonizable substratum and the low diversity of habitats. On the other hand, the low proportion of Phaeophyceae is the reason for which the R/P and (R+C)/P ratios take disproportionately high values and so they are not useful in this geographical area. As regards the degree of endemism, the marine benthic flora of Namibia includes quite a high number of taxa endemic to southern Africa (55 taxa; 28.1% of the flora); 25 of these 55 taxa (12.8% of the flora) are endemic to the biogeographic Benguela Marine Province and only Acrosorium cincinnatum is endemic to the Namibian coasts.Key words: Namibia, marine algae, morphology and anatomy, distribution, biogeography, taxonomy, check-list. RESUMEN: ALGAS BENTÓNICAS MARINAS DE NAMIBIA. -Este trabajo recoge toda la información existente hasta el momento sobre la flora bentónica marina de Namibia y proporciona nuevos datos sobre su composición y biogeografía, además de descripciones detalladas y valoraciones críticas de muchas de sus especies. El trabajo se ha realizado a partir de muestras florísticas recolectadas entre los años 1986 y 1989 en las zonas eulitoral y sublitoral superior de la costa de la mitad norte del país, entre Walvis Bay y la desembocadura del río Kunene. Según los datos actuales, la flora bentónica marina de Namibia está representada por 196 táxones (147 Rhodophyceae, 20 Phaeophyceae, 15 Ulvophyceae, 6 Cladophorophyceae y 8 Bryopsidophyceae), 21 de los cuales no habían sido citados hasta el momento de las costas de este país. Se trata de una flora de carácter templado que se caracteriza principalmente por el bajo número de especies, la escasa proporción de feofíceas y el elevado grado de endemismo. En cuanto al número de especies, la flora de Namibia es relativamente pobre, debido a la escasa disponibilidad de substrato colonizable y a la baja diversidad de hábitats. Por otra parte, la baja proporción de feofí-ceas hace que los índices R/P y (R+C)/P adopten valores desproporc...

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Section: Historical Backgroundmentioning

confidence: 99%

Section: (Map 42)mentioning

confidence: 99%

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Marine benthic algae of Namibia

Lluch

2002

Sci. Mar.

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“…Unfortunately, even when these reproductive features are present, they must be used with caution because it is not uncommon to find specimens with intermediate or even variable stichidial morphology, and tetrasporangium size has been found to vary with position within the stichidia, maturation or even latitude (noted here for P. lyngbyanum). Therefore, the other morphological attributes conventionally employed for distinguishing species of Plocamium in other areas of the world (colour, consistency, thallus width and section shape, number of ramuli per series, morphology and size of basal ramulus, habitat: see Simons, 1964;Womersley, 1971;South & Adams, 1979;Gabrielson & Scagel, 1989;Wynne, 2002) are a useful, although imperfect, complement for species discrimination in northern Europe.…”

Section: Molecular Analyses and Taxonomic Characters In Plocamiummentioning

confidence: 99%

“…Traditional taxonomy distinguishes between Plocamium species largely on the basis of the number of ramuli in alternating series, the morphology of the lower ramulus, the length, width, colour and consistency of the thallus, and the morphology and arrangement of tetrasporangial stichidia and cystocarps (Simons, 1964;Womersley, 1971;South & Adams, 1979;Gabrielson & Scagel, 1988). Biogeographical criteria, however, are also important, because many species or groups of species have a restricted distribution.…”

Section: Introductionmentioning

confidence: 99%

A new taxonomic interpretation of the type ofPlocamium cartilagineum(Plocamiales, Florideophyceae) and its consequences

Cremades

Barreiro

Maneiro

et al. 2011

European Journal of Phycology

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A detailed study of the type specimen of Plocamium cartilagineum and other original material of European species of Plocamium revealed that the nomenclatural reorganization proposed by Saunders & Lehmkuhl in 2005 must be revised. The main consequences of the new interpretation are: (1) the use of Plocamium lyngbyanum to name their molecular entity EUR1 (previously considered to be equivalent to P. cartilagineum s.s.); and (2) adopting P. cartilagineum for their molecular entity EUR2, which renders P. subtile Ku¨tzing a taxonomic synonym. Using a combination of morphological, anatomical and molecular information (barcoding), we conclude that the colour and consistency of the thallus, the number of ramuli per series, the morphology and arrangement of the tetrasporangial stichidia, the length of the tetrasporangia, and the type of habitat are the most reliable characters of classical taxonomy for discriminating between the species of Plocamium occurring in northern Europe.

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