Pleurothallis hamosa Barb. Rodr. 1881 SUBGENUS Acianthera [Scheidw.] Luer 1986

Photo courtesy of © Dalton Holland Baptista

Leaf and Flower

Another View - La Caraça, Minas Gerais, Brazil elevation 1200 meters

Photo by © Jay Pfahl


Drawing by © Helmut Seehawer

Common Name The Hook Pleurothallis [refers to the Hook-Like Leaf apex]

Flower Size .2" [5 mm]

Found in Minas Gerais and Rio de Janiero states of Brazil at elevations of 1000 to 1300 meters on wet moss covered rock faces of on rock ledges with cracks full of sand or small rocks as a small sized, cool growing, shortly repent lithophyte on vertical, shady rocks that requires shade and heavy humidity with erect, slender ramicauls enveloped by 3 tyubular sheaths and carrying a single, apical, erect, coriaceous, broadly ovate, fleshy, conduplicate, dark green, shell like, tilted to at least a 45' angle from the ramicaul, refexed and hooked apically with acute apices, cordate intothe petiolate base leaf that and blooms in May in Brazil, on 1 t o 2, .8 to 1" [2 to 2.5 cm] long, to 7 flowered inflorescence

Kew puts this species as a synonym of P prolifera but these orchids are easily distinguished in their habitat, this one at the lowest elevations on cliff walls, by how they grow and differ in flower form. This one is medium sized, and is less elongate in length than P prolifera and P limae has the smallest and most ovate flower form.

Synonyms Acianthera hamosa (Barb. Rodr.) Pridgeon & M.W. Chase 2001; Pleurothallis hamosa var. longicaulis Cogn. 1906

References W3 Tropicos, Kew Monocot list , IPNI ;

* Gen. Spec. Orchid. 2: 31 Barb Rodr. 1881;

Flora Brasiliensis Vol III Part 4:524 Martius, Cogniaux 1896;

Flora Brasiliensis Vol III Part 4:tab 105 Martius, Cogniaux 1896 drawing fide;

Orchidaceae Brasilensis Band 1 Pabst & Dungs 1975 drawing good;

Icones Pleurothallidonarum Vol III Systematics of Pleurothallis Luer 1986;

AOS Bulletin Vol 69 No 7 2000 photo fide;

Lindleyana Vol 16 No 4:244 Pridgeon & M.W.Chase2001 as Acianthera hamosa;

The Organ Mountain Range Its History and Its Orchids Miller, Warren, Miller and Seehawer 2008 drawing fide

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