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Bulbophyllum involutum Borba, Semir & F. Barros (Orchidaceae), a New Species from the Brazilian "Campos Rupestres"

1998; Missouri Botanical Garden Press; Volume: 8; Issue: 3 Linguagem: Inglês

10.2307/3392005

1945-6174

Eduardo Leite Borba, João Semir, Fábio de Barros, João Semir, Fábio de Barros,

Plant Pathogens and Fungal Diseases

Bulbophyllum involutum, a new orchid species from the "campos rupestres" of Brazil, is de¬ scribed and illustrated, with notes about the biology of the species.It is also compared with B. warmin¬ gianum, B. ipanemense, and B. longispicatum.Bulbophyllum Thouars is one of the largest or¬ chid genera, with over 1100 species, and has a pantropical distribution, concentrated especially in the Old World Tropics (Dressier, 1993).The last revision of this genus for Brazil was that of Cogniaux (1902); many species have been de¬ scribed more recently in various publications.At present, 54 Bulbophyllum species are recorded for this country (Pabst & Dungs, 1975, 1977).The lack of a recent revision has led to difficulty in identi¬ fication of the Brazilian species and has frequently given rise to wrong determinations.One of the major taxonomic problems in this genus involves a group of species mainly found in the Bra¬ zilian "campos rupestres," where about eight of these species are vegetatively uniform, and separation is only possible by use of very subtle floral characters that are difficult to recognize in herbarium material, in spite of relatively easy diagnosis in the field.These problems, in addition to the lack of a revision of the genus, have led to misinterpretations of some species, many of them being wrongly identified as Bulbophyl¬ lum warmingianum Cogniaux.In the course of reproductive biology studies of some species of this complex (Borba & Semir, in press), several populations originally interpreted as B. warmingianum and B. ipanemensis Hoehne were seen to possess some traits that separate them as a distinct species, described as follows: