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Pupulin, F. 2005. Dichaea viridula (Orchidaceae: Zygopetalinae), a new species in the D. tenuifolia complex. Harv. Pap. Bot. 10(1): 83-87.

Abstract. The taxonomic status of Dichaea tenuifoliaSchltr.is revised, the species is lectotypified and D. undulifoliaDodson from Ecuador is reduced in synonymy under the former taxon. Populations of CostaRican Dichaea with thin-textured leaves and smooth ovary, previously included under D. tenuifolia, are recognizedas a distinct species, hereafter described and illustrated as D. viridula Pupulin. Dichaea viridula may be distinguished from its closest relative, D. tenuifolia, by the shorter inflorescence, the flowers approximately half in size, the elliptic-lanceolate sepals (vs. narrowly oblong-ligulate), the petals only slightly narrowed at thebase, the thick margins of the lip claw, the much shorter apical lobe of the lip, the green sepals and petals, and the white lip.

Key Words. Orchidaceae, Dichaea, D. tenuifolia, D. undulifolia, D. viridula, Costa Rica, Colombia, Ecuador.

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