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A new species of Pleurothallis (Pleurothallidinae) from the southwestern Andes of Colombia in the National Natural Park Farallones de Cali

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A new species of Pleurothallis from subsection Macrophyllae-Fasciculatae is described and illustrated. The new species is compared with Pleurothallis folsomii from Panama. Pleurothallis celsia is most similar to a group of species with small, yellow flowers but it can be recognized mainly by its lip, which is widely ovate, the surface and margin pilose and papillate, and the base of the glenion densely vesiculose. Resumen. Se describe e ilustra una nueva especie de Pleurothallis de la subsección Macrophyllae-Fasciculatae. La especie nueva se compara con Pleurothallis folsomii de Panamá. Pleurothallis celsia es similar a un grupo de especies con flores pequeñas, amarillas, pero se puede reconocer principalmente por su labelo, que es ampliamente ovado, con la superficie y el margen pilosos y papilados, y la base del glenion densamente vesiculosa. Keywords / Palabras clave: Alto Anchicayá, Celsia, Orchidaceae, sistemática, systematics, taxonomía, taxonomy
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LANKESTERIANA 23(2): 401–407. 2023. doi: http://dx.doi.org/10.15517/lank.v23i2.56290
A NEW SPECIES OF PLEUROTHALLIS (PLEUROTHALLIDINAE)
FROM THE SOUTHWESTERN ANDES OF COLOMBIA IN THE
NATIONAL NATURAL PARK FARALLONES DE CALI
Juan SebaStián Moreno1–3,6, robinSon Galindo-tarazona1,
MeliSa aleGría-Valencia3,4, Mark WilSon5 & aleJandro zuluaGa trÓchez3,4
1Parques Nacionales Naturales de Colombia, Dirección Territorial Pacíco,
Carrera 117 # 16B-00, Cali, Colombia.
2Grupo de Investigación Schultes, Fundación Ecotonos, Cali, Colombia.
3Departamento de Biología, Universidad del Valle, Calle 13 # 100-00, Cali, Colombia
4Grupo de Investigación Ecología y Diversidad Vegetal, Universidad del Valle,
Calle 13 # 100-00, Cali, Colombia.
5Department of Organismal Biology and Ecology, Colorado College, 14 East Cache La Poudre,
Colorado Springs, 80903, USA.
6Author for correspondence: juan.moreno.silva@correounivalle.edu.co
ORCID of the Author: JSM , RGR , MAV , MW , AZT
Received 16 May 2023; accepted for publication 9 August 2023. First published online: 25 August 2023.
Licensed under a Creative Commons Attribution-NonCommercial-No Derivs 3.0 Costa Rica License.
Introduction. Pleurothallis R.Br. (Brown 1813) is one
of the most diverse genera in terms of species rich-
ness of orchids within the subtribe Pleurothallidinae. It
can be found in Central America and some countries of
South America with more than 500 species described
to date (Karremans & Vieira-Uribe 2020, Luer 1986,
1989, 1998, 1999, 2005), and Colombia is the country
with the most recorded species of Pleurothallis, with
247 species (Bernal et al. 2016, Karremans et al. 2023,
Ministerio de Ambiente y Desarrollo Sostenible y Uni-
versidad Nacional de Colombia 2015).
The members of the Pleurothallis subsection
Macrophyllae-Fasciculatae Lindl. (Lindley 1859,
Luer 1986) are identiable mainly by their sessile
leaves with a typically cordate base, owers arranged
in a fascicle, lateral sepals connate into a synsepal
that is somewhat similar to the dorsal sepal, a bilobed
stigma, and a lip lying on or slightly elevated above
the synsepal (Luer 2005, Sierra-Ariza 2023, Wilson
et al. 2018).
Here, we describe and illustrate a new species
of Pleurothallis subsection Macrophyllae-Fascicu-
latae from the Tropical Moist Forest from Valle del
Cauca Department in the Western Andes of Colom-
bia, morphologically similar to a diverse group of
species with small yellow flowers up to 3 cm long
and cordate leaves.
Materials and methods. The description and draw-
ings were prepared from living specimens and ow-
ers preserved in 70% alcohol. Flowers were dis-
sected, measured, and photographed using Celestron
abStract. A new species of Pleurothallis from subsection Macrophyllae-Fasciculatae is described and il-
lustrated. The new species is compared with Pleurothallis folsomii from Panama. Pleurothallis celsia is most
similar to a group of species with small, yellow owers but it can be recognized mainly by its lip, which is
widely ovate, the surface and margin pilose and papillate, and the base of the glenion densely vesiculose.
reSuMen. Se describe e ilustra una nueva especie de Pleurothallis de la subsección Macrophyllae-Fasciculatae.
La especie nueva se compara con Pleurothallis folsomii de Panamá. Pleurothallis celsia es similar a un grupo
de especies con ores pequeñas, amarillas, pero se puede reconocer principalmente por su labelo, que es am-
pliamente ovado, con la supercie y el margen pilosos y papilados, y la base del glenion densamente vesiculosa.
keyWordS / PalabraS claVe: Alto Anchicayá, Celsia, Orchidaceae, sistemática, systematics, taxonomía, taxonomy
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Handheld Digital Microscope Pro. Vegetative struc-
tures were measured from dried material and repro-
ductive structures from spirit material. Digital images
were taken with a Nikon D750 and a Nikon 105mm
f/2.8 macro lens. Sketches from living and preserved
specimens were digitized, and the images were used
for diagramming a draft composite template in Adobe
Photoshop® CS6. A digital composite line drawing
was then made (lines and stippling) in Procreate il-
lustration application for iPad 6th generation tablet
computer (Bogarín et al. 2019). The new species
was described following the botanical terminology
by Beentje (2010) and Stearn (1992). All original
descriptions of related species were consulted for
detailed comparisons (Luer 2005). We consulted
specimens from the following herbaria: AMES, COL,
CUVC, HUA, JAUM, JBB, VALLE, CAUP and MO
(online), and no additional material of the new spe-
cies was found.
taxonoMic treatMent
Pleurothallis celsia Gal.-Tar. & J.S.Moreno sp. nov.
(Fig. 1–2).
TYPE: COLOMBIA. Valle del Cauca: Municipio de
Buenaventura, represa del Alto Anchicayá, Parque
Nacional Natural Farallones de Cali, 976 m, 23 May
2020. R. Galindo- Tarazona 1463 (holotype: CUVC).
(Fig. 1–2)
diaGnoSiS: Pleurothallis celsia is most similar to Pleu-
rothallis folsomii (Luer & Endara) J.M.H.Shaw from
which it can be distinguished by having a 3-veined
dorsal sepal (vs. 5-veined) and most notably by its lip,
which is widely ovate, the surface and margin pilose
and papillate, with the base of the glenion densely ve-
siculose (vs. ovate, the surface smooth and the margins
serrate, the base of the glenion smooth).
Plant epiphytic, caespitose, erect to suberect,
15.6–23.0 cm tall. Roots slender, up to 0.64 mm in di-
ameter. Ramicauls 12.4–19.8 cm long, with a tubular
sheath on the lower third and two other sheaths at the
base, the sheaths papyraceous, light brown. Leaf cori-
aceous, ovate, acuminate to long acuminate, 7.8–8.2 ×
3.85–3.95 cm, the base deeply cordate. Inorescence
a fascicle of successive owers, up to 4 simultaneous
owers, enclosed at the base by a spathaceous bract
ca. 1.07 cm long; peduncle terete, 1.86–2.61 mm long;
oral bract tubular, papyraceous, acute, 5.11–6.98
mm long. Pedicel terete, 7.7–8.35 mm long. Ovary
verrucose, terete, longitudinally sulcate, 4.36–4.69
mm long. Flowers with the perianth yellow. Sepals,
membranaceous, glabrous. Dorsal sepal, lanceolate,
obtuse, 7.21–9.18 × 2.98–4.22 mm, 3-veined, the
veins carinate on the adaxial surface. Lateral sepals
connate into an ovate, acute synsepal, concave at
base, 6.08–7.83 × 4.39–5.34 mm, 6-veined. Petals,
linear, falcate, the surface and margin pilose, acute,
3.43–4.85 × 1.06–1.25 mm, 1-veined. Lip, eshy,
widely-ovate, rounded, the surface and margin pilose
and papillate, 2.06–2.83 × 1.76–2.54 mm, 3-veined,
central lip shallowly concave at the base of the gle-
nion, the glenion obovate, the base with two rounded
and elevated, pronounced lobes, densely vesiculose.
Column, short, semiterete, 1.04–1.20 mm long, with
a short foot, thick; stigma apical, bilobed. Anther cap
yellow-cream, apical, obovate, papillose, 0.85 × 1.67
mm. Pollinia two, obovoid.
ePonyMy: In honor of the energy company CELSIA,
that has contributed to the exploration, description, and
conservation of the ora, in particular, orchids, in the
Farallones de Cali National Natural Park in collabora-
tion with the National Park, Universidad del Valle, and
other institutions of the region. The epithet is used here
as a noun in apposition.
diStribution and ecoloGy: Pleurothallis celsia was
discovered and described as an epiphyte of secondary
vegetation along the edge of the roads (Fig. 3) in the
western slope of the Western Cordillera, near a hydro-
electric dam within the National Natural Park Faral-
lones de Cali, where the species might be very well
protected, due to the access for the general public be-
ing highly restricted (Moreno et al. 2020).
Discussion. Pleurothallis celsia (Fig 4A) belongs to
a group of species with similar, concolorous yellow
owers that mainly differ by the number of veins in
the sepals and the shape and indumentum of the pet-
als and lip. The new species is morphologically most
similar to Pleurothallis folsomii (Fig. 4B) from Pan-
LANKESTERIANA 23(2). 2023. © Universidad de Costa Rica, 2023.
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Moreno et al. — A new species of Pleurothallis from Valle del Cauca
FiGure 1. Pleurothallis celsia Gal.-Tar. & J.S.Moreno. A. Habit. B. Flower. C. Dissected perianth. D. Lip and column lateral
view. E. Lip, adaxial and abaxial views. F. Anther cap and pollinia. Illustration by J.S.Moreno based on the type.
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LANKESTERIANA 23(2). 2023. © Universidad de Costa Rica, 2023.
FiGure 2. Pleurothallis celsia Gal.-Tar. & J.S.Moreno. A. Habit. B. Flower. C. Dissected perianth. D. Lip and column lateral
view. E. Lip, adaxial and abaxial views. F. Anther cap and pollinia. LCDP by J.S.Moreno.
LANKESTERIANA 23(2). 2023. © Universidad de Costa Rica, 2023.
405
Moreno et al. — A new species of Pleurothallis from Valle del Cauca
FiGure 3. Pleurothallis celsia Gal.-Tar. & J.S.Moreno. A. Leaf and ower, front side. B. Flower. C. Habit and growth, in
situ. Photographs by J.S.Moreno (A, B) and R. Galindo-Tarazona (C).
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LANKESTERIANA 23(2). 2023. © Universidad de Costa Rica, 2023.
ama as mentioned in the diagnosis, but is also similar
to Pleurothallis carduela (Luer) J.M.H.Shaw (Shaw
2016) (Fig. 4C) from Ecuador (Luer 2005), a spe-
cies that is characterized by having a 7-veined dorsal
sepal (vs. 3-veined), minutely denticulate margin of
the petals and smooth indument (vs. margin and indu-
ment pilose) and the lip elliptical (vs. broadly ovate)
with the indument and the margin denticulate (vs. in-
dument and margin pilose and papillate).
acknoWledGeMentS. The authors are pleased to express a
sincere gratitude to the energy company CELSIA for their com-
mitment to environmental care and their determined support for
scientic research and environmental education processes in
the Farallones de Cali National Natural Park - middle and upper
basin of the Anchicayá River. Finally, we are very grateful to
Rudy Gelis for letting us use the photo of Pleurothallis cardu-
ela to make the comparisons with the new species. Collections
of the new species were done under permit 1070 of August 28th
of 2015, modied by permit 01004 of 07 June 7th of 2019.
FiGure 4. Most similar species to Pleurothallis celsia Gal.-Tar. & J.S.Moreno. A. Pleurothallis celsia B. Pleurothallis folsomii
(Luer & Endara) J.M.H.Shaw. C. Pleurothallis carduela (Luer) J.M.H.Shaw. The white arrows show the margin and sur-
face of the lip and petals of the three species. Photographs by J.S. Moreno (A), M. Wilson (B) and Rudy Gelis (C).
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