LANKESTERIANA


DISTRIBUTION AND ECOLOGY: Known only from two
specimens from the same area in central Pacific
Costa Rica, epiphytic in tropical wet forest, pre-
montane belt transition, at 450 m elevation.

PHENOLOGY: Flowering occurs from March to June.

PARATYPE: COSTA RICA. San Jose: Perez Zeled6n,
Viento Fresco del Brujo, 450 m, epiphytic on culti-
vated trees in the village, 21 Jan. 2001, flowered in
cultivation at Gaia Botanical Garden, 13 June 2001,
F. Pupulin, D. Castelfranco & L. Elizondo 2878
(USJ, Spirit Coll.!).

 Myoxanthus vittatus is closely related to M.
aspasicensis, Pleurothallis tomentosa, M. sem -
pergemmatus and M. uncinatus, but it is distin-
guished by the small size, the densely pubescent
ovary, the whitish flower striped with purple, the
sepals adaxially smooth, and the ligulate, obtuse
lip.
 Pleurothallis tomentosa Luer was described
from a single Costa Rican collection made by
Endres around 1867 and kept at Reichenbach's
herbarium in Vienna, and it is supposed to be
extinct (Luer 2000). This species may be easily dis-
tinguished from M. vittatus by the purple-black
flowers with an oblong lip, rounded at apex. In
order to avoid paraphyly in Myoxanthus as intend-
ed here, a new combination is required for Endres'
species:


Myoxanthus tomentosus (Luer) Pupulin & M.A.
Blanco, comb. nov.
 Bas.: Pleurothallis tomentosa Luer, Orqui-
deologia 21(3): 337. 2000.


CITED LITERATURE
Barbosa Rodrigues, J. 1882. Chaetocephala, Gen. Spec.
 Orch. Orchid. Nov. 2: 37.
Dressier, R.L. 1993. Phylogeny and classification of the
 orchid family. Dioscorides Press, Portland.
Karsten, H. 1847. Duboisia. Allg. Gartenz. 15: 394.
 1848. Dubois-Raymondia. Bot. Zeitung (Berlin) 6:
 397.
Luer, C.A. 1982. A reevaluation of the genus Myoxanthus
 (Orchidaceae). Selbyana 7(1): 34-54.
 1992. Icones Pleurothallidinarum IX. Systematics
 of Myoxanthus. Addenda to Platystele, Pleurothallis
 subgenus Scopula, and Scaphosepalum. Monogr. Syst.
 Bot., Missouri Bot. Gard. 44: 1-128.
 1995. A re-evaluation of the Pleurothallid subgen-
 era Satyria and Silenia (Orchidaceae). Monogr. Syst.
 Bot., Missouri Bot. Gard. 57: 146.
 2000. Miscellaneous new species in the
 Pleurothallidinae. Orquideologia 21(3): 318-340.
Poeppig, E.F. & S.L. Endlicher. 1835. Myoxanthus mono .
 phyllus. Nov. Gen. Sp. Pl. 1: 50, t. 88.
Pridgeon, A.M. & W.L. Stern. 1982. Vegetative anatomy
 of Myoxanthus (Orchidaceae). Selbyana 7(1): 55-63.