Lankesteriana 17(2)

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https://hdl.handle.net/10669/80701

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A new species of Lepanthes (Orchidaceae: Pleurothallidinae) from Colombia with a large and protruding column
(2017) Moreno, Juan Sebastián; Vieira Uribe, Sebastian; Karremans Lok, Adam Philip
A new species of Lepanthes from the Western Cordillera of the Colombian Andes, characterized by similar triangular sepals with a large and protruding column, is described and illustrated. The new species is similar to Lepanthes pelorostele from Ecuador, but can be distinguished from the latter by having orange and ciliate sepals and larger petals and lip.
Additions to the Costa Rican Myoxanthus (Orchidaceae: Pleurothallidinae)
(2017) Rojas Alvarado, Gustavo; Karremans Lok, Adam Philip
Pleurothallis cerea, a species described based on a specimen collected by Lankester in Costa Rica, and commonly placed under the synonymy of Myoxanthus octomeriae or M. congestus, is here recognized as distinct. The species is easily distinguished by the shape and size of the leaf, as well as various floral details, especially of the lip. A new combination, tentatively suggested by Carl Luer but never published, is required and therefore validated. Additionally, the vegetatively striking Myoxanthus affinis is recorded from Costa Rica for the first time based on two recent collections. The species is variable within its broad distribution from Colombia to Bolivia and, although differences with the original material from Peru are evident, we cannot be sure at this time that ours represents a different species. Both species are described and illustrated based on living plants.
Four new species of Pleurothallis (Orchidaceae: Pleurothallidinae) from the Valle del Cauca Department in Colombia
(2017) Karremans Lok, Adam Philip; Rodríguez Martínez, Lizeth; Rincón Useche, Cristian
Pleurothallis indecora, P. juvenilis, P. lueriana and P. queremalensis are described from material collected in the municipality of Dagua, department of Valle del Cauca, Colombia. The four species were found during field inventories of the Orchidaceae in San José del Salado and El Queremal, they are illustrated, and a comparison with their closest relatives is provided.
Genera Pleurothallidinarum: the era of Carlyle Luer
(2017) Karremans Lok, Adam Philip; Davis, Nicolas
The era or Carlyle Luer, which currently comprehends the forty-two years since the publication of the first Icones Pleurothallidinarum in 1975, has witnessed a true revolution in the knowledge and understanding of the species belonging to the subtribe. When Luer came into the scene, after more than two hundred years of Pleurothallidinae history, there were barely 4,000 published taxon names in the subtribe, including 52 generic names and barely 1,650 accepted species. Today there are 12,133 published taxon names, including 164 generic names, and 5,114 currently accepted species belonging to the subtribe. This means that during the Luerian era published taxa, accepted or otherwise, were tripled. During this period the rate of species description has been about 85-90 species per year, and there is nothing suggesting this rate will slow down anytime soon. If this trend is maintained, as we believe it will, by the year 2026, the subtribe will include close to six thousand accepted species.
Masdevallia luerorum (Orchidaceae: Pleurothallidinae), a new species from Costa Rica
(2017) Bogarín Chaves, Diego Gerardo; Oses Salas, Lizbeth; Smith Martin, Christina Marie
Masdevallia luerorum from the southern Pacific region of Costa Rica is described and illustrated. It resembles M. lata, but differs in the single flowered inflorescence, the shorter sepals, the broad and cylindrical sepaline tube, the smaller mentum beneath the column-foot, a smaller secondary mentum, a slight deflection between the two mentums, and the lip with marginal folds near the middle, apically rounded and conspicuously verrucose. Initial phylogenetic evidence indicated that Masdevallia nicaraguae is closely allied to M. luerorum. However, M. nicaraguae is distinguished by the white flowers suffused with fuchsia stripes toward the bases of sepals and the thick and triangular, shorter sepaline tails of the lateral sepals. Moreover, both species are isolated geographically
Novelties in Costa Rican Stelis (Orchidaceae: Pleurothallidinae): two new species and a new record in the "Dracontia group"
(2017) Karremans Lok, Adam Philip; Díaz Morales, Melissa
Stelis dies-natalis and Stelis aenigma, belonging to a group of mostly Middle American species alternatively placed in genus Dracontia, are described and illustrated based on living material. They were both found in oak forests at high elevations on diverse peaks of the Talamanca mountain range in Costa Rica. The first, S. dies-natalis, was found on Cerro Buena Vista and Cerro Urán, and is somewhat similar to S. hydrabut can be distinguished by the relatively short inflorescence, the dark purple flowers with a yellow lip covered by dark purple warts, the apiculate apex of the petals and the lip with a shortly acuminate apicule. The second, S. aenigma, was initially believed to be a specimen of S. dies-natalis when it was collected on Cerro Utyum, but itcan be easily distinguished by the few-flowered inflorescence that barely exceeds the leaf, the reddish flowers, the sigmoid lip and the cucullate, obtuse anther.Stelis platystylis, a species previously known from Mexico to Nicaragua is illustrated based on living material from Costa Rica.
Two new species of Echinosepala (Orchidaceae: Pleurothallidinae)
(2017) Pupulin, Franco; Karremans Lok, Adam Philip; Belfort Oconitrillo, Noelia
We describe and illustrate two new species of Echinosepala from Costa Rica, they are placed within a phylogenetic framework of the genus, and compared to their closest relatives. A short resume of the genus’ history is given, reviewing the main characters that have been used to group its species at various taxonomic ranks. Echinosepala expolita is compared with E. pan, from which it mainly differs by the glabrous, inflated sheaths that cover the ramicaul, the distinctly broader ligulate-lanceolate leaves, the lanate-hirsute ovary, the much larger flower, and the tomentose abaxial indumentum of the sepals. Echinosepala longipedunculata is similar to E. aspasicensis, but can be recognized by the unusually long peduncle, the greenish yellow flower, the verrucosetuberculate adaxial surface of the sepals, and the shorter, truncate, orange lip. A key to the Costa Rican species of Echinosepala is provided. A new combination in Echinosepala is proposed for Acianthera biseta from Peru
Two new species of Pleurothallis (Orchidaceae: Pleurothallidinae) allied to P. cardiothallis, with a note on flower activity
(2017) Pupulin, Franco; Díaz Morales, Melissa; Aguilar Velásquez, Jaime; Fernández Campos, Melania
Two new species of Pleurothallis subsection Macrophyllae-Fasciculatae from Costa Rica, allied to P. cardiothallis, are described and illustrated, and their relationships discussed. Pleurothallis scotinantha is compared with P. oncoglossa, from which it can be easily distinguished by the concolorous, dark purple flowers, the distinctly de exed petals, and the lip without a distal callus that is not hooked at the apex. Pleurothallis navisepala, from the northern Costa Rican cordilleras, is compared with P. cardiothallis, from which it is distinguished by the simultaneous owering of two or more owers, the much smaller size of the flowers, and the deeply navicular sysnsepal, which prevents complete spreading of the ower. A key to the Costa Rican species of the group is presented. Observations on oral behavior in the species allied to P. cardiothallis are provided and the possible function of this behavior is discussed. The visit of a tephritid y to the flowers of P. navisepala is described.
Two novelties in genus Platystele (Orchidaceae: Pleurothallidinae) from Costa Rica
(2017) Karremans Lok, Adam Philip; Bogarín Chaves, Diego Gerardo
Two new species of Platystele allied to P. oxyglossa complex are described from Costa Rica. Platystele carl-lueriana can be distinguished from P. catiensis and P. oxyglossa by the compact inflorescence that barely exceeds the leaf, from P. pedicellaris by the large plants with long leaves and small flowers, and from P. tausensis by the yellowish sepals and petals (vs. purple stained) and the minutely glandular (vs. apically hirsute) lip. The second species, Platystele jane-lueriana, can be easily distinguished by the glabrous flowers, and the conspicuously inflated, bulbous lip, with an incurved apex. Among the other members of the complex, it is most closely resembles P. pedicellaris in the compact inflorescence that is subequal to the leaves, but is distinguished by tail-less sepals and the linear-ligulate petals. With these additions, the total number of Costa Rican Platystele reaches twenty species.

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