MISCELLANEOUS NEW SPECIES IN THE PLEUROTHALLIDINAE (ORCHIDACEAE) C. A. Luer* Acostaea bicomis Luer, sp. nov. Species haec A . costaricensis Schltr. similis sed callo labelli bicorni dif fert. Plant very small, epiphytic, densely caespitose, roots comparatively thick, flexuous. Secondary stem abbreviated, 1-3 mm long, enclosed by 2-3 loose, ribbed, tubular sheaths. Leaf erect, coriaceous, elliptical-obovate, mar-gined, 5-10 mm long, 3-4 mm wide, the obtuse apex notched, apiculate, the base cuneate into a short petiole. Inflorescence a weak, successively flowered raceme up to 3 cm long including the filiform peduncle, from a node on the secondary stem; floral bract 0.5-1 mm long; pedicel 1-1.5 mm long; ovary 1 mm long; sepals translucent red, glabrous, the dorsal sepal transversely ovate, obtuse, deeply concave, 3 mm long, 5 mm wide expanded, the lateral sepals connate into an elliptical lamina 5 mm long, 3 mm wide; petals trans-lucent yellow, elliptical to lightly falcate, acute, 2 mm long, 0.75 mm wide; lip yellow, more or less oblong, 2 mm long, 0.5 mm wide, the apex bifid with a deflexed apiculum in the sinus, the base membranous, concave, at-tached with tension to the column-foot, the disc with a broad, elongated cal-lus, rounded below, the apical portion free, subquadrate, the lateral apical angles produced into short, antrorse horns; column yellow-white, membra-nous with broadly rounded wings, bidentate at the apex, 2 mm long, 3 mm wide expanded, with a broad, concave foot 1.5 mm long. Etymology: From the Latin bicornis, "two-horned," referring to the apex of the callus of the lip. TYPE: PANAMA: PANAMA: Epiphytic in cloud forest, Cerro Jefe, alt. 1000 m, 2 March 1976, C. Luer, J. Luer, P. Taylor & R. Dressier 744 (Holo-type:SEL). Distribution: Eastern Panama. This species is similar to A. costaricensis but differs in the two-horned callus of the lip. See next species for discussion. Acostaea unicornis Luer, sp. nov. Species haec A. costaricensis Schltr. similis sed callo labelli unicorni differt. Plant very small, epiphytic, densely caespitose; roots comparatively thick, flexuous. Secondary stem abbreviated, 2-4 mm long, enclosed by 2-3 loose, ribbed, tubular sheaths. Leaf erect, coriaceous, elliptical-obovate, mar-gined, 7-15 mm long, 3-5 mm wide, the obtuse apex notched, apiculate, the base cuneate into a short petiole. Inflorescence a weak, successively flowered raceme up to 4 cm long including the filiform peduncle, from a node on the secondary stem; floral bract 0.5-1 mm long; pedicel 1-1.5 mm long; ovary 1 mm long; sepals translucent red-purple, glabrous, the dorsal sepal transversely ovate, obtuse, deeply concave, 3 mm long, 5 mm wide spread out, the lateral sepals connate into an elliptical lamina 5 mm long. 3 mm wide; petals trans-lucent yellow, elliptical to lightly falcate, acute, 1.5 mm long. 0.4 mm wide; * The Marie Selby Botanical Gardens, 811 S. Palm Avenue, Sarasota, FL 33577 379
BioStor
