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BLUMEA BLUMEA[Top of this page] [Catalogue of publications] [NHN]
Section Fuliginosae Pfitzer & Kraenzl. of the genus Coelogyne Lindl. is revised. With the help of a pollen study, principal component and cluster analyses with morphological characters and a survey of some additional data, two species are recognized (C. fimbriata and C. triplicatula), including one dubious variety (C. fimbriata var. acuminata). Eleven names are reduced to synonymy. Three species formerly included in sect. Fuliginosae by several authors are excluded (C. micrantha, C. treutleri and C. schilleriana).
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Section Verrucosae Pfitzer & Kraenzl. of the genus Coelogyne Lindl. is revised using morphological and molecular data. Eight species are recognized, including two new ones (C. marthae and C. verrucosa). One name is reduced to synonymy. Four species formerly included by several authors in sect. Verrucosae (C. brachyptera, C. papillosa, C. parishii and C. virescens) are excluded. A total evidence analysis of morphological characters and ITS and matK sequence data supports the monophyly of the section as here recognized. Coelogyne virescens (sect. Brachypterae) is identified as nearest neighbour to the species of sect. Verrucosae. The number of sterile bracts on the rhachis and the shape of the ornamentation on the epichile appear to be phylogenetically informative characters, in contrast with the inflorescence type, ovary indumentum and number of keels on the hypochile.
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Mallotus sect. Polyadenii comprises eight species. It includes the former genus Coccoceras. Mallotus leucodermis var. puberulus, endemic to the Solomon Islands, is recognised on the species level as M. puber. Mallotus anisopodus, from Indochina, is synonymised with M. plicatus from Myanmar. The identification of species is difficult, especially of M. leucodermis and M. muticus. The two species are partly sympatric and only pistillate flowers or fruits provide reliable characters; specimens with staminate flowers are very difficult to identify.
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A revision of Pachycentria Blume, which includes the monotypic Pogonanthera Blume, is presented. Pachycentria comprises eight species and one subspecies. Two species, P. vogelkopensis and P. hanseniana, are newly described. The genus is distinguished from other genera in the Medinillinae by a small ovary in an urceolate hypanthium, and by seeds with comb-shaped testa cells. Andromonoecy is recorded for three species of the genus. Pollination by bees and dispersal by birds and ants has been observed in the field. Pachycentria is distributed in Burma, Thailand, Peninsular Malaysia, Sumatra, Java, Borneo, Philippines, Sulawesi, and New Guinea.
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The monotypic genus Paraselliguea, based on Polypodium leucophorum Baker, is validated.
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The genus Cyathostemma Griff., occurring from SW China to NE Australia, is revised, and a total of ten species is recognised. One new species, C. siamensis, is described. The status of the genus Tetrapetalum Miq. is discussed and reduced, in part, to synonymy with Cyathostemma, and in part to Uvaria L. A key to taxa is given, with new descriptions and distribution maps.
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A new species of Ficus subg. Sycidium sect. Palaeomorphe, F. corneriana C.C. Berg, is described.
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A new species Begonia siccacaudata is described. It belongs to the sect. Petermannia but is distinguished from other species by being stemless with a short fleshy rhizome. The female flowers are solitary, the male flowers are borne on a many-flowered thyrsoid inflorescence of a type not yet described within the genus. The epithet siccacaudata refers to the axes of the inflorescences which persist for a long time after dying off.
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The genus Millettia Wight & Arn. is revised for the Flora Malesiana area. Two new species are described: M. borneensis and M. glabra. Pongamia velutina (C.T. White) Verdc. is transferred to Millettia; as the epitheton velutina is already in use in Millettia, a new name is proposed: M. velve-tina Adema. In total 15 species are recognised for the area concerned. A key to the species is given. An identification list and an index of names are included.
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Borassodendron machadonis pollen occurred throughout the Holocene pollen record of Nong Thale Song Hong, Thailand, until about 4000 BP. It was also present in one sample from Khok Phanom Di, Thailand, and in the Mahakam Delta, Kalimantan, records, but B. machadonis has not been reported from the modern flora of Kalimantan. Borassodendron machadonis pollen differs greatly from that of B. borneense, which is found on the island of Borneo.
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We have identified two new species of Metrosideros subg. Mearnsia (Myrtaceae) growing on, and apparently endemic to, the massif known as the Roches d’Ouaïème in New Caledonia. Of these two species, we include M. whitakeri in sect. Mearnsia and M. rotundifolia in sect. Calyptropetala. Both morphological assessments and phylogenetic analyses based on nrDNA sequence variation produced congruent interpretations of the novelty of the new species and of their classification.
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A taxonomic revision is given of Hemarthria R.Br. (Gramineae–Andropogoneae–Rottboelliinae) occurring in the warm to tropical areas of the Old World (mainly in SE Asia), with one introduced in the New. Fourteen taxa are recognised, including a variety and a new species from Vietnam proposed here. A neotype for the lectotype species had to be designated.
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The genealogical relationships in the green algal genus Microspora (Chlorophyceae) are determined by phylogenetic analysis based on 15 ecological, morphological and reproductive characters. It is found that the traditional defining characters like cell shape and distinctness of the H-shaped pieces (composing the cell wall) play a major role in rooting of the cladograms and that species – forming a prominent rope-like growth habit in rapid streams – are closely related. It is suggested that the pH value of the habitat proves to give a more substantial phylogenetic signal than the type of water movement.
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The first southern African records are presented of Ptilothamnion codicolum and Vickersia baccata; Scageliopsis tsitsikammae is described as new to science. The genera Scageliopsis and Vickersia have not been previously recorded in southern Africa. Morphological descriptions and illustrations are given for all three species.
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Last modified april 24, 2006 by P. Hovenkamp.