Research interests:

Oxalis biosystematics

Protea-Ophiostomatoid fungi-arthropod interactions

---

Publications

2010

1. Roets, F., Wingfield, B.D., De Beer, Z.W., Wingfield, M.J, & Dreyer, L.L. 2010. Two new Ophiostoma species from Protea caffra in Zambia. Persoonia. 24: 1.364



2. Oberlander, K.C., Dreyer, L.L. & Roets, F.  2010. Oxalidaceae: rediscovery and phylogenetic position of the rare Oxalis purpurata. Bothalia 40: 187–188



3. Dreyer, L.L., Oberlander, K.C. & Roets, F. 2010. Reassessment of the taxonomic status of Oxalis fabaefolia (Oxalidaceae) and the description of a unique variety of Oxalis flava from the Northern Cape Province of South Africa. Blumea. In press



4. Albert, B., Nadot, S., Dreyer L.L. & Ressayre, A. 2010. The influence of tetrad shape and intersporal callose wall formation on pollen aperture pattern ontogeny in two unrelated eudicot species. Annals of Botany 106:   557–564



5. De Jager, M.L., Ellis, A.G. & Dreyer, L.L. 2010. The assembly of flower colour within communities of Oxalis (Oxalidaceae) through pollinator-mediated selection. Oecologia. In press



6. Oberlander, K.C., Dreyer, L.L. & Roets, F. 2010.  New primers for single-copy nuclear-encoded chloroplast-expressed glutamine synthetase (ncpGS) in Oxalidaceae. American Journal of Botany. In press.

2009:

1. Dreyer, L.L., Roets, F. & Oberlander, K.C. 2009. Oxalis saltusbelli: a new Oxalis (Oxalidaceae) species from the Oorlogskloof Nature Reserve, Nieuwoudtville, South Africa. South African Journal of Botany 75: 110–116



2. Zietsman, J., Dreyer, L.L. & Jansen van Vuuren, B. 2009. Phylogeographic patterns in Oxalis (Oxalidaceae): a tale of rarity, recent divergence and a widespread congener in the Cape Floristic Region. South African Journal of Botany 75: 27–33



3. Roets F., Dreyer, L.L., Crous, P.W., Wingfield, M.J. 2009. Mite-mediated hyperphoretic dispersal of Ophiostoma spp. from the infructescences of South African Protea spp. Environmental Entomology 38(1):  143–152



4. Oberlander, K.C., Dreyer, L.L. & Curran, H. 2009. An unusual new species of Oxalis (Oxalidaceae) from the Knersvlakte, South Africa. South African Journal of Botany 75: 239–245.



5. Verboom, G. A., Dreyer L. L. & Savolainen, V. 2009. Understanding the origins and evolution of the world’s biodiversity hotspots: the biota of the African ‘Cape Floristic Region’ as a case study. Molecular Phylogenetics and Evolution Special Cape Biota Issue 51: 1–4



6. Verboom, G.A., Archibald, J.K. Bakker, F.T., Bellstedt, D.U., Conrad, F., Dreyer, L.L., Forest, F., Galley, C., Goldblatt, P., Henning, J.F.,  Mummenhoff, K., Linder, H.P., Muasya, A. M., Oberlander, K.C., Savolainen, V., Snijman, D.A., Van der Niet, T. & Nowell, T.L.  2009. Origin and diversification of the Greater Cape flora: ancient species repository, hot-bed of recent radiation, or both? Molecular Phylogenetics and Evolution Special Cape Biota Issue 51: 44–53



7. Oberlander, K.C.,  Emshwiller, E.,  Bellstedt, D.U. & Dreyer, L.L. 2009. Towards a model of bulb evolution in the eudicot genus Oxalis L. Molecular Phylogenetics and Evolution Special Cape Biota Issue 51: 54–63



8. Roets, F., Wingfield, M.J., Crous, P.W. & Dreyer, L.L. 2009. Fungal radiation in the Cape Floristic Region: an analysis based on Gondwanamyces and Ophiostoma. Molecular Phylogenetics and Evolution Special Cape Biota Issue 51: 111–119



9. Curran, H., Roets, F. & Dreyer, L.L. 2009. Anther-smut fungal infection of South African Oxalis species: spatial distribution patterns and impacts on host fitness. South African Journal of Botany; Pollination Special Issue. 75: 807–815

2008

1. Bellstedt, D.U., Marais, E.M. & Dreyer, L.L. 2008. Phylogenetic relationships in the genus Zygophyllum based on trnL-F and rbcL sequence data.  MPE 47:  932-949



2. Zietsman, J., Dreyer, L.L. & Esler, K.J. 2008. Reproductive biology and ecology of elected rare and endangered Oxalis L. (Oxalidaceae) plant species. Biological Conservation 141: 1475-1483



3. Roets, F., De Beer, W., Crous, P.W., Dreyer, L.L. & Wingfield, M.J. 2008.. Ophiostoma gemellus and Sporothrix variecibatus from mites infesting Protea infructescences in South Africa. Mycologia 100: 496-510



4. Roets, F., Dreyer, L.L., Wingfield, M.J. & Begeroc, D. 2008. Thecaphora capensis (Glomosporiaceae), a newly described STD of Oxalis in South Africa. Persoonia 21: 147-152

2007

1. Roets, F., Wingfield, M.J., Crous, P.W. & Dreyer, L.L. 2007. Discovery of fungus-mite-mutualism in a unique niche.  Environmental Entomology 36: 1226-1237. (IF = 1.467)



2. Nadot, S., Penet, L., Dreyer, L.L. & Ressayre, A. 2007. Aperture pattern and microsporogenesis in Asparagales. In J.T. Columbus et al.Monocots, Comparative Biology and Evolution, Poales. Missouri Botanical Garden Press, ISBN 9780960580875

2006

1. Dreyer, L.L., Esler & K.J. Zietsman, J. 2006. Climate influences flowering phenology of Oxalis - implications under climate change. S. Afr. J. Bot. 72: 150-156 (IF = 0.44)



2. Roets, F., Wingfield, M.J., Dreyer, L.L., Crous, P.W., & Bellstedt, D.U. 2006.  A PCR-based method for the detection of Ophiostoma and Gondwanamyces on insects collected from the infructescences of South African Protea species. Canadian Journal of Botany 84:  989-994 (IF = 1.19)



3. Roets, F., De Beer, Z.W., Dreyer, L.L., Crous, P.W., Zipfel, R. & Wingfield, M.J.  2006. Multigene phylogeny of Ophiostoma species associated with Protea infructescences, including two new species. Studies in Mycology 55: 199-212 (IF = 5.923)



4. Roets, F., Crous, P.W., Dreyer, L.L. & Geertsema, H. 2006. Proteaceae infrutescences arthropod communities: guild structure, seasonal rhythmic variation and the influence of infructescence phenology. African Entomology 14 : 257-265 (IF = 0.407)

2005

1. Penet, L., Nadot, S., Ressayre, A., Forchioni, A., Dreyer, L.L. & Gouyon, P-H. 2005. Multiple  developmental pathways leading to a single morph: monosulcate pollen (Examples from the Asparagales). Ann. Bot. 95: 331-343 (IF = 2.939)
   
   
   
2. Ressayre, A, Dreyer, L.L., Triki-Teurtroy, S., Forchioni, A. & Nadot, S. 2005. Post-meiotic cytokinesis and pollen aperture pattern ontogeny: comparison of development in four species differing in aperture pattern. Am. J. Bot. 92: 576-583 (IF = 2.512)
   
   
   
3. Roets, F., Crous, P.W. & Dreyer, L.L. 2005. Seasonal trends in ophiostomatoid fungal infections of Protea infructescences. S. Afr. J. Bot. 71: 307–311 (IF = 0.44)

2004

1. varieties of Oxalis minuta (Oxalidaceae) and the change of O. minuta var. callosa to specific rank as O. hygrophila. S. Afr. J. Bot. 70: 259-264. (IF = 0.648)



2. Oberlander, K. C., Dreyer, L.L., Bellstedt, D.U & Reeves, G. 2004. Congruence of trnL-F and palynological data sets in the southern African Oxalis L. section Angustatae subsection Lineares. Taxon 53: 977-985. (IF = 2.519)
   

BOOK CONTRIBUTIONS

Dreyer, L.L. & Oberlander, K.C. Oxalidaceae. In Viktor et al. (eds). New red data list of southern African plants. Strelitzia??. National Botanical Institute, Pretoria , South Africa . (accepted to be published May 2006)

Dreyer, L.L. & Makgakga, C. In Y. Steenkamp, M. Keith & W. Foden . South African checklist of plants, Strelitzia??. SANBI, Pretoria , South Africa . (submitted)

Nkonki, T., Dreyer, L.L., Glen, H.F. & Maserumule, K. 2003. Geraniaceae and Oxalidaceae. In Arnold and De Wet. Plants of southern Africa : an annotated checklist. Strelitzia 14: 14: 566-578. National Botanical Institute, Pretoria , South Africa .

Dreyer, L.L. & Makgakga, M.C. 2003. Oxalidaceae. In Germishuizen and Meyer. Plants of southern Africa : an annotated checklist. Strelitzia14: 762-770. National Botanical Institute, Pretoria , South Africa .

Dreyer, L.L. 2000. Aizoaceae ( Aizoon, Galenia, Tetragonia ), Cruciferae ( Heliophila ), Capparaceae ( Cleome ), Crassulaceae, Geraniaceae, Oxalidaceae and Ranunculaceae. In O.A. Leistner. Seed Plants of southern Africa . Strelitzia 10. National Botanical Institute, Pretoria , South Africa .

Dreyer, L.L. 1997. Aizoaceae ( Aizoon, Galenia, Tetragonia ), Cruciferae ( Heliophila ), Capparaceae ( Cleome ), Crassulaceae, Geraniaceae, Oxalidaceae and Ranunculaceae. In Meyer, Mossmer and Smith Taxonomic literature of southern African plants. Strelitzia 5, National Botanical Institute, Pretoria.

Dreyer, L.L.1997. Aizoaceae, Brassicaceae, Crassulaceae, Geraniaceae and Oxalidaceae. In G.F. Smith, E.J. van Jaarsveld, T.H. Arnold, F.E. Steffens, R.D. Dixon & J.A. Retief (eds.) List of southern African succulent plants, p. 3-5, 46, 56-63, 78-80, 131.

Dreyer, L.L. 1993 Aizoaceae ( Aizoon, Galenia, Tetragonia ), Cruciferae ( Heliophila ), Capparaceae ( Cleome ), Crassulaceae, Geraniaceae, Oxalidaceae and Ranunculaceae. In Arnold and De Wet. Plants of southern Africa : names and distributions. Memoirs of the Botanical Survey of South Africa 62.

SCIENTIFIC REPORTS

Dreyer, L.L. & Du Puy D.J. 1997. Research report: Survey of the distribution, geological preferences, plant-insect associations and taxonomic status of Bryophyllum delagoense in Madagascar . Alan Fletcher Research Station , Queensland , Australia .