Stonesia ghoguei, Peculiar Morphology of a New Cameroonian Species (Podostemaceae, Podostemoideae)

Pfeifer, Evelin; Grob, Valentin; Thiv, Mike; Rutishauser, Rolf

doi:10.3417/2007080

Cited by 13 publications

(15 citation statements)

References 15 publications

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“…Cusset (1987) was not aware of such ‘loose dyads’ in Djinga ; she described monads only. A similar situation is found in Stonesia G. Taylor (Pfeifer et al. , 2009).…”

Section: Discussionsupporting

confidence: 81%

“…This unique mode of increasing the number of stem-borne flowers was found in Dicraeanthus africanus, Ledermanniella letouzeyi C. Cusset, Stonesia ghoguei E. Pfeifer, Grob & Rutish. and Thelethylax minutiflora (Tulasne) C. Cusset (Rutishauser & Moline, 2005;Grob, Pfeifer & Rutishauser, 2007;Moline et al, 2007;Rutishauser et al, 2008;Pfeifer et al, 2009). In these species, parenchyma cells in the stem cortex dedifferentiate and divide into meristematic cells giving rise to endogenous buds.…”

Section: Of Flower Budsmentioning

confidence: 99%

“…, 2005; Moline et al. , 2007; Pfeifer, Grob & Rutishauser, 2009; Ameka, Ghogue & Rutishauser, in press).…”

Section: Introductionmentioning

confidence: 99%

“…The African taxa of Podostemaceae are taxonomically, phylogenetically and morphologically relatively poorly known (Rutishauser, Pfeifer & Bernhard, 2007). The last taxonomic treatment was 20 years ago (Cusset, 1987;Lebrun & Stork, 1991), but some taxonomic and phylogenetic studies on African Podostemaceae have recently been carried out (Kita & Kato, 2001;Kita et al, 2005;Moline et al, 2007;Pfeifer, Grob & Rutishauser, 2009;Ameka, Ghogue & Rutishauser, in press).…”

Section: Introductionmentioning

confidence: 99%

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Enigmatic morphology ofDjinga felicis(Podostemaceae - Podostemoideae), a badly known endemic from northwestern Cameroon

Ghogue¹,

Ameka

Grob

et al. 2009

Botanical Journal of the Linnean Society

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Djinga is a monotypic genus restricted to the Cameroon Ridge (‘Dorsale Camerounaise’) of NW Cameroon. Besides the type locality Mount Djinga (Adamawa Province, near Tignère), it also grows in waterfalls near Mount Oku (NW Province). This paper describes the structure and development of Djinga felicis using scanning electron microscopy and microtome sections. Cusset's protologue is enriched considerably. Roots are green, dorsiventrally flattened and adherent to submerged rocks. They are broad ribbons or crusts (up to 1 cm broad) which branch exogenously. Root‐borne shoots (up to 17 cm) have filamentous leaves with sheaths and (occasionally) attached stipules. Flowers are borne as part of reproductive short shoots which arise exogenously along the stems and endogenously along the roots. Djinga shows non‐axillary stem branching. Reproductive shoots along the main stem usually stay short. They arise from the abaxial side of double‐sheathed leaves, a key innovation of Podostemoideae. These short shoots shift into pocket‐like stem positions clearly below their associated leaves. Each flower bud inside a spathella is erect, but with an inclined ovary. The flowers are unistaminate with a broad connective. Unlike many other Podostemoideae, the tricolpate pollen grains are arranged in both dyads and monads. The ovary is globular and unilocular. The mature 8‐ribbed capsule dehisces by two slightly unequal valves, releasing 40–50 seeds. © 2009 The Linnean Society of London, Botanical Journal of the Linnean Society, 2009, 160, 64–81.

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“…Cusset (1987) was not aware of such ‘loose dyads’ in Djinga ; she described monads only. A similar situation is found in Stonesia G. Taylor (Pfeifer et al. , 2009).…”

Section: Discussionsupporting

confidence: 81%

Section: Of Flower Budsmentioning

confidence: 99%

“…, 2005; Moline et al. , 2007; Pfeifer, Grob & Rutishauser, 2009; Ameka, Ghogue & Rutishauser, in press).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Enigmatic morphology ofDjinga felicis(Podostemaceae - Podostemoideae), a badly known endemic from northwestern Cameroon

Ghogue¹,

Ameka

Grob

et al. 2009

Botanical Journal of the Linnean Society

Self Cite

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“…The unusual morphology of riverweeds is linked to their environment, although specific cause-effect relationships remain unclear (e.g. Pfeifer et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Silica bodies and their systematic implications at the subfamily level in Podostemaceae

et al. 2011

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Podostemaceae is a family of eudicotyledonous rheophytes with unique morphology, sometimes resembling algae, lichens or bryophytes. This study evaluates the taxonomic value of silica-body morphology (presence, location, size, shape, ornamentation) in species representing the three subfamilies: Tristicha trifaria (Bory ex Willd.) Spreng. (Tristichoideae), Weddellina squamulosa Tul. (Weddellinoideae) and Diamantina lombardii Novelo, C.T.Philbrick & Irgang (Podostemoideae). T. trifaria and D. lombardii have silica bodies in stems and leaves. In contrast, W. squamulosa exhibits silica bodies only in the scale-like leaves. The morphology of these bodies is unique to each species. The results denote the taxonomic usefulness of silica characteristics and a need for a more complete study of silica bodies throughout the family. Key words: aquatic plants, Podostemaceae, silica bodies. ResumoPodostemaceae é uma família eudicotiledônea reófita de morfologia peculiar, lembrando por vezes algas, liquens ou briófitas. O presente estudo avalia o valor taxonômico da morfologia dos corpos silicosos (presença, localização, tamanho, forma e ornamentação) em espécies representantes das três subfamílias: Tristicha trifaria (Bory ex Willd.) Spreng. (Tristichoideae), Weddellina squamulosa Tul. (Weddellinoideae) e Diamantina lombardii Novelo, C.T.Philbrick & Irgang (Podostemoideae). T. trifaria e D. lombardii apresentam corpos silicosos nos caules e nas folhas, enquanto W. squamulosa possui estas estruturas restritas às folhas escamiformes. A diversidade morfológica dos corpos silicosos, específica para cada espécie aqui estudada, comprova o potencial taxonômico deste caráter, até então negligenciado, e aponta para a necessidade de estudos mais abrangentes para essas estruturas em Podostemaceae. Palavras-chave: corpos silicosos, plantas aquáticas, Podostemaceae.

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How to get off the mismatch at the generic rank in African Podostemaceae?

et al. 2009

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Stonesia ghoguei, Peculiar Morphology of a New Cameroonian Species (Podostemaceae, Podostemoideae)

Cited by 13 publications

References 15 publications

Enigmatic morphology ofDjinga felicis(Podostemaceae - Podostemoideae), a badly known endemic from northwestern Cameroon

Enigmatic morphology ofDjinga felicis(Podostemaceae - Podostemoideae), a badly known endemic from northwestern Cameroon

Silica bodies and their systematic implications at the subfamily level in Podostemaceae

How to get off the mismatch at the generic rank in African Podostemaceae?

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