The Genus Microcladia (Red Algae) in South Africa

Simons, R. H.

doi:10.4102/abc.v9i2.1609

Cited by 5 publications

(8 citation statements)

References 2 publications

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“…Concerning M. exserta, Stegenga (1986) stated that it differs from M. gloria-spei by its smaller size and its prostrate habit. M. gelidii is a South African east coast species and, according to Simons (1967), it has axial cells a little wider than high and 6-7(-9) pericentral cells; these features distinguish M. gelidii from the other two species. M. exserta was described by Wynne (1985a) from Natal, and its South African distribution is restricted to the east coast (Bolton and Stegenga, 1987;Anderson and Stegenga, 1989;Farrell et al, 1993).…”

Section: Genus Microcladia Greville (1830)mentioning

confidence: 99%

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: Genus Microcladia Greville (1830)mentioning

confidence: 99%

Marine benthic algae of Namibia

Lluch

2002

Sci. Mar.

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“…Its report from tropical western Africa has been discounted (Lawson & John, 1982). Apparently, M. gelidii Simons (1967) is the only other species of Microcladia previously reported from Africa. Like M. exserta, M. gelidii occurs in southern Africa (Port St John, Transkei) and is the only other species of the genus in which tetrasporangia are exserted.…”

Section: Diagnosismentioning

confidence: 91%

“…Grey., the type of the genus, are bilaterally compressed (flattened), which is a strong point of similarity between it and the new species. The present circumscription of Microcladia includes some species with terete axes, but several workers have expressed the idea that Microcladia, containing both flat and terete forms, may be a heterogeneous group of species (Feldmann-Mazoyer, 1941;Hommersand, 1963;Simons, 1967).…”

Section: Diagnosismentioning

confidence: 99%

“…In both species the lateral periaxial cells are larger than the periaxial cells on the ventral or dorsal surfaces of the thallus. In M. gelidii the pericentral cells are also unequal in size, the largest in two opposite rows corresponding to the edges of the flattened thallus, equalling the height of the axial cells and alternating with them (Simons, 1967). Likewise, in Herpochondria the periaxial cells are of unequal size, the lateral ones being larger than the ventral and dorsal ones (Okamura, 1900(Okamura, , fig.…”

Section: Diagnosismentioning

confidence: 99%

“…At present, approximately nine to 11 species are assigned to this genus (Hommersand, 1963;Simons, 1967;Itono, 1977). Microcladia is closely related to the genus Ceramium Roth, but the separation of these two genera has been long accepted.…”

mentioning

confidence: 99%

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