Mesadenella tonduzii (Schltr.) Pabst & Garay 1953
Drawing by © Silvia Troyo
TYPE Drawing by © Schlechter
LATE
EARLIER 
Common Name Tonduz's Mesadenella [American Orchid Collector in Central America Current]
Flower Size .08" [2 mm]
Found only in Puntarenas province of Costa Rica in evergreen tropical forests in low areas that periodically flood at elevations of 550 to 800 meters as a small sized, warm growing terrestrial with basal, erect patent, glabrous, elliptic-lanceolate, acuminate leaves that blooms in the late fall and earlier winter on an erect, terminal, reddish brown, 4.4 to 8" [11 to 20 cm] long overall, rachis 3.2 to 4" [8 to 10 cm] long, densely many flowered inflorescence enveloped by various green bracts and longer than the flower, lanceolate, acuminate, green with red margins, finely pubescent floral bracts.
Many references put M petenensis into synomery with this species and most likely is, I have only split them apart as Kew has it that way. The first drawing above has tiny hooks at the base of the lip but if you look at Schlechter's type drawing they are not there.
Synonyms *Spiranthes tonduzii Schltr. 1910; Stenorrhynchos tonduzii (Schltr.) Schltr. 1920
References W3 Tropicos, Kew Monocot list , IPNI ; Orchidaceae Brasilenses Band 1 Pabst & Dungs 1975 drawing fide; Las Orquideas de el Slavador Vol 3 Hamer 1981 NOT = M petenensis; Icones Plantarum Tropicarum Plate 873 Hamer 1983 NOT = M petenesis; Manual de Plantas de Costa Rica Vol 3 Hammel, Grayum, Herrera and Zamora 2003 drawing ok; Of Men & Orchids Part 1 Jenny 2015 as Spiranthes tonduzii drawing fide; Orchid Genera and Species in Guatemala Archila, Szlachchetko, Chiron, Lipinska, Mystkowska and Bertolini 2018
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