Lankesteriana

New combinations and other taxonomic changes for the forthcoming 'flore des mascareignes' Orchidaceae accounts

Abstract In preparation for the forthcoming orchid accounts of the Flore des Mascareignes lectotypifications are made for Angraecum cadetii, A. cornigerum, A. corrugatum, A. costatum, A. eburneum, A. mauritianum, A, patens, A. pingue, A. tenuifolium, Benthamia erinacea, B. perfecundum, Bulbophyllum commersonii, B. compressum, B. conicum, B. cordemoyi, B. densum, B. pusillum, B. variegatum, Cynorkis arnottioides, C. calcarata, C. calcaripotens, C. cordemoyi, C. falcata, C. fastigiata, C. flexuosatis, C. graminea, C. lilacina, C. nervilabris, C. paradoxa, C. pleiadea, C. purpurascens, C. reticulate, C. squamosa, C. trilinguis, C. variegata, Disperis cordata, Gastrorchis villosa, Habenaria arachnoides, H. lancifolia, H. praealta, H. undulata, Platylepis densiflora, P. margartifera, P. occlusa, Oeceoclades analavelensis and O. pulchra. Neotypifications are made for Angraecum tenuifolium, Benthamia spiraloides, Cynorkis coccinelloides and C. constellata. Clarification is provided of the taxonomy of Angraecum crassifolium, A. tenellum, Benthamia erinacea, Bulbophyllum densum, B. elliotii, B. incurvum, B. pendulum, Cheirostylis boryi, C. gymnochiloides, C. nuda, Cynorkis calcarata, C. coccinelloides, C. falcata, C. flexuosatis, C. squamosa, Habenaria sigillum, Oeceoclades analavelensis, Platylepis densiflora, P. margaritifera and P. occulta. New combinations are made for Benthamia spiraloides, Bulbophyllum elliotii var. latibracteatum, Cheirostylis boryi, Cynorkis aristei and C. flexuosatis.

Studies in Oberonia, 9: lessons from excess names in oberonia for Orchidaceae systematics, including a revision of the Oberonia sect. Scytoxiphium

Abstract The reasons for excess names in microfloral orchids such as Oberonia Lindl. can be traced to poor scholarship (e.g., failure to review the literature, ignoring expert advice), typological thinking, and erroneous assumption of microendemism. Some extraordinarily poor descriptions, including some from the 21st century, can be termed ''taxonomic vandalism''. The outdated reliance on drawings as opposed to z-stacked photographs and scanning electron micrographs poses further problems due to an abundance of demonstrable problems with drawings. The Oberonia sect. Scytoxiphium Schltr. with eight described species is reduced to one species, Oberonia heliophila Rchb.f.; it is illustrated by original drawings, live photographs and scanning electron microscope images. The distribution is extended from Java through Micronesia and Samoa. The species occurs predominantly from 0-500 m, less frequently to 900 m, and possibly to even 1900 m. It flowers throughout the year.

Rudolf Schlechter's South-American orchids IV. Schlechter's ''network'': Venezuela and Colombia

Abstract The fourth chapter of the series about Rudolf Schlechter's South-American orchids again presents abridged biographical information about the botanists and orchid collectors that formed part of Schlechter's South-American network and who travelled and worked in those countries on the continent's northern and Caribbean coasts, through Venezuela and Colombia. In the case of Colombia, we cross the isthmus of Darien and arrive for the first time on the Pacific coast of South America. As in other chapters, brief geographical and historical introductory outlines are presented for each of these countries, followed by a narrative on those orchidologists who visited the area, chronologically by the dates of their botanical collections.

Rudolf Schlechter's South-American orchids V. Schlechter's ''network'': Ecuador and Peru

Abstract The fifth chapter of the series about Rudolf Schlechter's South-American orchids introduces us to those botanists and orchid collectors who travelled and worked in Ecuador and Peru and supplied Schlechter with many of the new orchid species he described. As in previous chapters, the biographies and accomplishments of these travellers are preceded by brief geographical and historical outlines for each of these countries. It is worth mentioning that the lives and orchids of such prominent figures in the orchidology of South America as F.C. Lehmann, W. Hennis, E. Bungeroth and E. Ule, who collected in Ecuador and Peru, have already been mentioned in previous chapters and are therefore omitted here.

A new and previously misidentified species of Trisetella (Pleurothallidinae: Orchidaceae) from southeast Ecuador

Abstract Trisetella pachycaudata, a new species in the subtribe Pleurothallidinae, was discovered in the Zamora Chinchipe province of southeast Ecuador, and it is described here. Trisetella pachycaudata is compared with the most similar species (and others with which it has been confused in cultivation), T. triglochin, T. strumosa, and T. vittata. It differs from them in the flowers with a much thicker apex of the sepaline tails (the thickest in the genus), and the petals expanded at the labellar margin, with the cuspidate apices erose on the upper margin and entire at the lower margin.

Resumen Trisetella pachycaudata, una nueva especie de la subtribu Pleurothallidinae, ha sido descubierta en la provincia de Zamora Chinchipe al sureste de Ecuador y es descrita aquí. Trisetella pachycaudata es comparada con las especies más similares (y con las que se le ha confundido en cultivo) T. triglochin, T. strumosa, y T. vittata. Se diferencia de estas por producir flores con los ápices de las caudas sepalinas más gruesas en comparación con cualquier otra especie conocida del género, los pétalos expandidos hacia el margen labelar, con el margen superior eroso mientras el margen inferior es entero y cuspidado.