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Pollen morphology in tribe Dicomeae Panero and Funk (Asteraceae)

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Abstract

To better understand the taxonomy and phylogeny of the Dicomeae (Asteraceae) the pollen morphology of seven genera including 15 species of that tribe and six genera with seven species belonging to five related tribes was studied by use of light and scanning electron microscopy. The quantitative data were analysed by use of principal-components analysis (PCA). The exine ultrastructure of Erythrocephalum longifolium and Pleiotaxis rugosa was also studied by use of transmission electron microscopy. Three pollen types were distinguishable from the apertural, columellar, and spinular morphology and inter-spinular sculpture. A dichotomous key to these pollen types is proposed. The existence of the Dicomeae as an independent tribe and its subdivision in two subtribes (Dicominae and Pleiotaxinae) are supported by this study, which also suggests the Oldenburgieae and the Tarchonantheae are the closest tribes to Dicomeae.

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Acknowledgments

The authors are grateful to the Directors of the COI, K, MA, NBG, PRE, and S herbaria for the loan of herbarium vouchers. The authors also thank Professor Augusto Dinis for allowing the use of equipment from the Laboratory of Microscopy, Department of Life Sciences (University of Coimbra), Professor Carlos Gonçalves, Director of the Laboratory of Histology of the Faculty of Medicine of the same University, for kindly helping us to obtain SEM micrographs of Pleiotaxis, and the anonymous reviewer.

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Authors and Affiliations

  1. Department of Life Sciences, Faculty of Sciences and Technology, University of Coimbra, Coimbra, Portugal

    A. Pereira Coutinho & D. Sá da Bandeira

  2. Department of Biology and CIBIO, Faculty of Sciences, University of Porto, Porto, Portugal

    R. Almeida da Silva

  3. Department of Botany, Faculty of Pharmacy, University of Santiago de Compostela, Santiago de Compostela, Spain

    S. Ortiz

Authors
  1. A. Pereira Coutinho
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  2. R. Almeida da Silva
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  3. D. Sá da Bandeira
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  4. S. Ortiz
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Corresponding author

Correspondence to A. Pereira Coutinho.

Appendix: Studied specimens

Appendix: Studied specimens

Brachylaena discolor DC.

Moçambique. Ilha de Inhaca, 3.IX.1975, A. Reis Moura 695 (COI). Ilha de Inhaca, 27.VII1982, D. Zuzunga 357 (COI).

Chuquiraga jussieui J. F. Gmel.

Bolivia. LaPaz, Murillo, entre LaPaz y Palca, 25. II. 1979, A. Ceballos, Charpin, F. Casas & V. Bermejo BO-522 (MA).

Chuquiraga oppositifolia D. Don

Chile. Prov. Colchaqua, San Fernando, Termas del Flaco, 13. XI. 1983, G. Montero 12450 (MA).

Cloiselia carbonaria S. Moore

Madagascar. Vallées du Mangoky et de L’ Isahaina, 10/1933, 11294 (K). La Table, Tuléar, 11. XI. 1962, F. Chauvet 359 (K). Plateau calcaire Mahafaly entre Stample et Ampanily, 16. X. 1970, M. Keraudren-Aymonin & G. Aymonin 24572 (K).

Cloiselia oleifolia (Humbert) S. Ortiz

Madagascar. Collines des environs de Berlanyer, V. 1902, H. Bâthie 1428 (K). Environs de Tuléar, 6. XI. 1960, J. Leandri, Ratoto, Jean de Dieu 3730 (K).

Dicoma anomala Sond.

Zaire. Haut-Shaba, Plateau de la Monica. Angola. Huíla, Humpata, 9. VI. 1960, Teixeira & Andrade 4740 (COI). Huambo, Nova Lisboa, Chianga, 6. VII. 1970, Silva 3181 (COI).

Dicoma tomentosa Cass.

Angola. Mossâmedes, 26. IV. 1938, Abreu 81 (COI). Mozambique. Tete, pr. Missão de Boroma, 21. VI. 1941, A. R. Torre 2921 (COI).

“Dicomopsis” welwitschii (= Dicoma welwitschii O. Hoffm.)

Angola. Benguela, Cacomba, 26. VII. 1905, Gossweiler 1798 (COI). Iter. Angolense, s. d., Welwitsch 3629 (COI). Quanza Sul, 24. VI. 1942, Excell & Mendonça 3069 (COI). Huambo, Nova Lisboa, 15. VI, 1971, M. da Silva 3668 (COI).

Erythrocephalum longifolium Benth. ex Oliv.

Kenia. 8. I. 1969, Mouarig 114 (K). N’Gomeni, Tanga, 18. IV. 1964, H. Faackman, 3980 (K). Malawi. Musidi Road, 8. I. 1969, Mouarig 114 (K).

Erythrocephalum marginatum (O. Hoffm.) S. Ortiz & A. P. Cout.

Tanzania. Dakara Ranch, 26. IV. 1988, Pócs 86 (K).

Erythrocephalum microcephalum Dandy

Kenya. 35 miles SW of Kinui, 30. I. 1957, Bogdon 63 (K). Tanganyica. Kikori, 20. II. 1930, Burtt 64 (K). Uganda. I. 1922, Dummer 5015 (K).

Gongylolepis sp.

Venezuela. Territorio Federal del Amazonas, Depto. Atabapo, Cerro Duida, Rio Negro, 19. XI. 1991, J. Fuertes & J. M. Cardiel 1267 (MA 524239)

Macledium latifolium (DC.) S. Ortiz

South Africa. Potberg, Bredasdorp, s. d., Acocks 23014 (PRE).

Macledium sessiliflorum (Harv.) S. Ortiz

Tanzania. Kilosa District, near Ruaha River, 12 km W. of Kidatu Bridge, 4. IX. 1970, M. Thulin & B. Mhoro 856 (K). 26 km SE of Mtware, 6 km SW of Msimbati, 1. XI. 1977, R. Wingfield 4416 (K). Magubie, Mamboya, VIII. 1930, A. Haarer 1835 (K).

Macledium spinosum (L.) S. Ortiz

South Africa. Noukloof Nature Reserve, 13. XI. 1982, D. F. Laidler 432 (PRE).

Oldenburgia paradoxa Less.

South Africa. Montagu, II.1983, Kotze & Parker 341 (NBG). Western Cape Province, Oudtshoorn district, Cradockberg, George, IV. 1963, Esterhuysen 30160 (S).

Pasaccardoa baumii O. Hoffm.

Angola. Benguela, 1910, Gossweiler 3017 (K). Bié, Cuemba, 18. X. 1966, R. Monteiro & Murta 2024 (COI). Bié, Chitembo, Anhara do Rio Cutato, a 7 km de Chuinda, 19. X. 1966, J. B. Teixeira et al. 10780 (COI).

Pasaccardoa jeffreyi Wild

Angola. Lunda, Xassengue, IV. 1937, H. W. (COI). Lunda, Xassengue, IV. 1937, Gossweiler 11799 (COI).

Pleiotaxis rugosa O. Hoffm.

Angola. Lunda, Dala, 18. VIII. 1927, Carriço & Mendonça 362 (COI). Huambo, 17. V. 1969, Moreno s. n. (COI). Huambo, pr. Rio Cuando, 17. V. 1969, Moreno, s. n. (COI).

Pleiotaxis subpaniculata Chiov.

Angola. Nova Lisboa, Sacaala, 18. II. 1962, Murta 103 (COI).

Stenopadus sp.

Venezuela. Territorio Federal del Amazonas, Depto. Atabapo, P. N. Duida-Marahuaca, Cerro Duida, Rio Negro, 19. XI. 1991, J. Pedrol 4585 JP (MA 524700).

Tarchonanthus camphoratus L.

Zimbabwe. Southern Zimbabwe, western slope of Dokodoko Mountain, 1 mile from Hot Springs, 23 X. 1948, N. C. Chase 921 (COI).

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Pereira Coutinho, A., Almeida da Silva, R., Sá da Bandeira, D. et al. Pollen morphology in tribe Dicomeae Panero and Funk (Asteraceae). Plant Syst Evol 298, 1851–1865 (2012). https://doi.org/10.1007/s00606-012-0686-5

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