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456 mm 1 M * * , Fig. 1. Deiregyne alinae Szlach. a, habit; b, flower; c, dorsal sepal and petal; d, lateral sepal; e, lip; : gynostemium, bottom view; rostellum remnant. Santa Martinez 2037). f, g, (J. 457 covered by scarious, semi-transparent cauline bracts. Leaves lacking at flowering time. mm Inflorescence 90- 120 long, 40-60-flowered, dense, Flowers lower cylindrical. erect in part and horizontal upper above in part, distinctly constricted the ovary, small. Floral bracts 13- semi forming mm mm long, 2.7-4 ermis nerved mm mm mm mm more long, 2-2.6 wide, mm 4.2mm pubescent on margins; the epichile long, 3.3-4 wide, ovate-orbicular, papillose, mm mm hooded Gynostemium Column at the apex. 3-3.5 long. foot 3-3.5 long, adnate to the mm 1mm ovary neck. Anther 1.8-2 long. Viscidium long, elliptic to obovate-elliptic. E E E a CO E O ?,/' form between Deiregyne (below) Fig. 2. ramentacea (Garay) Szlach. h). (g, 458 NE Typus Santa Martinez 2037, Mexico, Michoacan, Puerto de Los Lobos, de J. al la : Apr Hierbabuena, Municipio de Indaparapeo. Hab. bosque de encino, 2400 m, 18 1987 (holo-, IEB). alt. Paratypus Santa Martinez 1339, Mexico, Michoacan, municipio de Querendaro, cerro Zacaton, J. : May (AMO). cerca de Milpillas. Bosque de Quercus, ladera de cerro, sobre penas, 2800 m, 3 1986 alt. Named my after Spiranthinae. In habit this species similar to Deiregyne pyramidalis (Lindl.) Burns-Balogh in both the is ; numerous The two inflorescence dense, long, cylindrical, with small flowers. differ distinctly, is however, the type of flowers and the form of the In D. pyramidalis the ovary neck very in lip. is and undivided whereas D. ovary neck short the lip ovoid-lanceolate, in alinae, the relatively is Burns-Balogh, and long section Deiregyne after 1988), the lip distinctly contracted in (cf. is As and somewhat the center. regards the structure of the flower parts, D. alinae similar to its is The D. ramentacea (Lindl.) Schlecht. distinguishing features of the former species are a : distinct narrowing between the ovary and sepaline tube; a very small hypochile with basal auricles and a large, apically hooded epichile. D. ramentacea has no constriction above the ovary, the hypochile and epichile are of similar width and often indistinctly separated, and the auricles are about mid-way along the length of the hypochile, the top of the epichile being flat. may should be added that D. alinae be mistaken for Oestlundorchis rhombilabia (Garay) It which both Burns-Balogh and Garay Szlach., a species (1982, 1986, 1988) (1982) included under the genus Deiregyne Schlecht., which they circumscribed so differently. 0. rhombilabia is similar to D. alinae in habit. In view of, amongst other things, the distinct 3-dentate rostellum remnant and the lip devoid of basal auricles, include this species in the recently described I genus Oestlundorchis Szlach. (Szlachetko, 1991 and in print). Acknowledgements am Ryszard Ochyra I grateful to Prof. Dr. hab. for trans : AMO diagnosis and the Curators of and IEB for the loan of herbarium specimens. REFERENCES — Burns-Balogh, P., 1982. Generic redefinition in the subtribe Spiranthinae (Orchidaceae). Amer. Bot J. 69 1119-1 132. : — A Burns-Balogh, P., 1986. synopsis of Mexican Spiranthinae. Orquidea (Mex.) 10 76-96. (1) — : Burns-Balogh, Monographia P., 1988. del genero Deiregyne Schlecht. {Orchidaceae). Orquidea (Mex.; J — 1 • 1 I j£*\j L . On Catling, M., P. 19: the lectotypification of the genus Deiregyne. Lindleyana 4 184-191. (4) : Garay, L. A., 1982. generic revision of the Spiranthinae. Mus. Bot. Harv. Leafl. Univ. 28 277- (4) : 425. — Schlechter, Versuch R., 1920 einer systematischen Neuordnung der Spiranthinae. Beih. Bot. Centralbl. 37 317-454. (2) : 459 — SZLACHETKO, D. L., 1991. Oestlundorchis (Orchidaceae, new Spiranthinae), a orchid genus from Mesoamerica. Fragm. Flor Szlachetko, D. L. (in print). of >typification Deiregyne Schlecht. Orquidea (Mex.). SzLACHETKO. D. L. fin nrinf» Genera and of A species the subtribe Spiranthinae. 8. revision of Oestlundorchis. Fragm. Geobot Flor.