Pleurothallis unguicallosa Ames & C.Schweinf. 1930 SUBGENUS Acianthera [Scheidw.] Luer 1986

Photo by Alejandro Flores


Drawing by R Solano and Icones Orchidacearum Plate 512 Hagsater & Soto 2002

Drawing & Collection sheet

Drawing and Collection sheet by Ames & Schweinfurth and The Harvard Botanical Website


Common Name The Clawed Pleurothallis [refers to the prominent callous at the apex of the lip]

Flower Size .2" [5 mm]

Found on Socorro Island in the Revillagigendo Archipelago to the west of Mexico in the Pacific on tree trunks on the eastern slope at elevations of 800 to 1000 meters as a mini-miniature sized, warm to cool growing, shortly repent epiphyte with straight to slightly arcuate, terete, slightly dilated towards the apex ramicauls enveloped by 2, tubular, obtuse, scarious sheaths and carrying a single, apical, deflexed in respect to the stem, green above, purple beneath, elliptic to lanceolate-elliptic, acute-acuminate, tridenticulate apically, slightly canaliculate below into the sessile base leaf that blooms in the summer through later spring on 1 to 4, shorter than the leaf, terete, almost simultaneous, 3 to 6 flowered inflorescence with minute, obliquely funnel-shaped, obtuse, shortly apiculate, floral bracts.

"Nearest ally is P wilsoni but it is a smaller plant and has a smaller flower with a single flowered peduncle with dissimilar petals and lip." Ames & Schweinfurth 1930

Synonyms Acianthera unguicallosa (Ames & C.Schweinf.) Solano 2002 publ. 2003; Ogygia unguicallosa (Ames & C.Schweinf.) Luer 2006

References W3 Tropicos, Kew Monocot list , IPNI ;

* Proc. Biol. Soc. Washington 43: 195 Ames & C.Schweinf. 1930

Icones Orchidacearum Plate 512 Hagsater & Soto 2002 as Acianthera unguicallosa drawing fide

Icones Pleurothallidinarum Vol XXVIII A Reconsideration of Masdevallia Systematics of Specklinia Luer 2006 as Ogygia unguicallosa

Pleurothallids Neotropical Jewels Vol 1 Karremans & Viera 2020 as Acianthera unguicallosa photo fide