Macroclinium Chasei (Orchidaceae, Oncidiinae): A new record for Brazil

Abstract

We present a new record for Brazil, Macroclinium chasei, until now known only from Bolivia and Peru. A description, illustration and photographs are presented, together with data of geographic distribution, and taxonomical and ecological comments.Resumo: É apresentado o registro de Macroclinium chasei para o Brasil, conhecida até o momento apenas para a Bolívia e Perú. São fornecidas a descrição, ilustração, prancha fotográ ca, além de dados de distribuição geográ ca, comentários taxonômicos e ecológicos da espécie.

Full text

LANKESTERIANA 17(3): 369–373. 2017.
MACROCLINIUM CHASEI (ORCHIDACEAE, ONCIDIINAE):
A NEW RECORD FOR BRAZIL
Mathias E. EngEls1,3 & liliEn C. FErnEda roCha2
1 Assessoria Técnica Ambiental Ltda., Rua Marechal José Bernardino Bormann, 821, Batel,
Curitiba, Paraná, Brazil, 80730-350
2 Juris Ambientis Consultores S S Ltda., Curitiba, Brazil
3 Author for correspondence: mathiasengels@hotmail.com
abstraCt. We present a new record for Brazil, Macroclinium chasei, until now known only from Bolivia and
Peru. A description, illustration and photographs are presented, together with data of geographic distribution,
and taxonomical and ecological comments.
rEsuMo. É apresentado o registro de Macroclinium chasei para o Brasil, conhecida até o momento apenas para
a Bolívia e Perú. São fornecidas a descrição, ilustração, prancha fotográca, além de dados de distribuição
geográca, comentários taxonômicos e ecológicos da espécie.
KEy words / Palavras ChavE: Amazon, Amazônia, Macroclinium, Mato Grosso, Oncidiinae, Rio Teles Pires
Introdution. The neotropical genus Macroclinium
Barb.Rodr. is constituted by 44 species (Govaerts
2016), found from Mexico to Bolivia and Brazil
(Pupulin 1997). Six species had been previously
recorded from Brazil: Macroclinium brasiliense
(Pabst) Dodson, M. mirabile (C.Schweinf.) Dodson,
M. paraense Campacci & da Silva, M. roseum Barb.
Rodr., M. saraca-taquerense Campacci & da Siva,
and M. wullschlaegelianum (Focke) Dodson. The
species are distributed in the states of Amazonas,
Goiás, Maranhão, Pará, Rio de Janeiro, Rondônia,
Roraima, Tocantins and in Distrito Federal (BFG 2015,
Campacci et al. 2015).
During the flora rescue at the Hydroeletric Power
Plant of Colíder (Mato Grosso State), material of
Macroclinium chasei Dodson & Benn. was collected,
corresponding to a new record for Brazil. The species
is here presented with a description, illustration,
photographs, as well as taxonomical and ecological
comments.
taxonoMiC trEatMEnt
Macroclinium chasei Dodson & D.E.Benn., Icon. Pl.
Trop., ser. 2, 1: t. 98 (1989).
TYPE: Peru. Huanuco: Leôncio Prado, 5–7 Km
towards La Divisoria from Tingo Maria, 850 m,
20.VII.1987, L. Moore ex D. Bennett & M. Chase 4092
(holotype MO, illustration!).
Epiphytic herbs. Roots ca. 0.5 mm thick, terete,
whitish. Stem compact, pseudobulbs absent. Leaves
alternate and imbricate, 4–6 by sympodium, 0.7–1.4
× 0.4–0.5 cm, laterally compressed, falcate, slightly
fleshy, apex acute to obtuse, green, with reticulate,
brownish and thick ribs. Inorescence axillar, bi-
flowered, at beginning simple, becoming composed
with the production of new secundary inflorescences;
main peduncle 15–33 mm long, 0.25 mm thick, terete,
brown to greenish; secundary peduncle 2–3 mm long,
0.25 mm thick, terete, brown to greenish. Flowers
resupinates. Ovary and pedicel ca. 4 mm long, 0.3
mm in diameter, terete, pale green. Dorsal sepal ca.
4 × 2 mm, elliptic to elliptic-oblanceolate, obtuse to
acute, white. Lateral sepals ca. 5.0 × 2.0–2.5 mm,
lanceolate-ovate, obtuse, white. Petals ca. 4 × 1 mm,
narrowly elliptic, acute, white with purple-pink dots.
Lip 5.0–6.0 × 1.5–2.0 mm, unguiculate, white to
white slightly pink; claw adaxially sub-canaliculate;
blade elliptic to elliptic-oblanceolate, acute to obtuse,
the margin sometimes slightly ondulate. Column
ca. 1.5 mm long, clinandrium minutely denticulate,
Received 4 March 2017; accepted for publication 1 July 2017. First published online: 18 September 2017.
Licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Costa Rica License
doi: http://dx.doi.org/10.15517/lank.v17i3.30637

LANKESTERIANA 17(3). 2017. © Universidad de Costa Rica, 2017.
370 LANKESTERIANA
white with base purple-pink. Anther ca. 0.6 mm long,
dorsixed, subovate, with two globoses protuberances
at the base, these with inconspicuously alveolate
surface, apex minutely denticulate, white with base
purple-pink. Pollinia 2, ca. 0.3 mm, ovate, laterally
flattened, yellow; stipe ca. 1 mm long, subspathulate,
translucid-white; viscidium ca. 0.1 mm long, rounded,
white-brownish. Fruits and seeds not seen.
FigurE 1. Macroclinium chasei. A. Habit. B. Section of leaf. C. Detail of texture of the leaf. D. Perianth flattened. E. Lip
flattened. F. Column with anther. G. Pollinarium. H. Pollinia in lateral view. Illustration by M.E.Engels based on Engels
& Bezerra 4773, MBM.

ExaMinEd MatErial. Brazil. Mato Grosso: Itaúba, Flora
rescue from UHE Colíder, fl., 21 July 2016, M.E.
Engels & A.S. Bezerra 4773 (MBM, RB, TANG –
spirit collection). Fig. 1–3.
Macroclinium chasei occurs in Bolivia, Peru
(Bennet & Christenson 1994, Pupulin 1997, Carnevali
& Cetzal-Ix 2012, Govaerts 2016) and Brazil, in the
Mato Grosso State (Fig. 3). This material correspond
FigurE 2. Macroclinium chasei. Habit and flowers (Engels & Bezerra 4773, MBM). Photographs by M.E. Engels.
LANKESTERIANA 17(3). 2017. © Universidad de Costa Rica, 2017.
EngEls & FErnEda roCha — Macroclinium chasei in Brazil 371

to the rst record of the species in Brazil. It was
found as an epiphyte of thin branches in the canopy
in the paludose forest (Stational Forest Always Green
Aluvial) crossed by a tributary stream of the Teles
Pires river, in southern Amazonia. Flowering occurs
from July to October.
We believe that this species may occur in other
areas of the Brazilian southern Amazonian that
share the same ecological and phytophysiognomics
conditions. According to Miranda and Menini Neto
(2010) several orchids are seldom collected because
they are rare, occur in places with difcult access (in
this case, trees canopy) and are not easily seen during
collect expeditions due to their small size. This facts
may explain the lack of records of Macroclinium
chasei in Brazil until now.
Macroclinium chasei belongs to M. sect. Hirtzae
Dodson & Pupulin, a group characterized by plants
without pseudobulbs, non-articulated leaves, bi-
flowered inflorescences, column with thickened apex,
dorsal anther, opercule xed at base of clinandrium,
and discoid and flat pollinia (Pupulin 2001). In addition
to M. chasei, other species belonging to this section
are M. biorum Bennet & Christenson, M. brasiliense,
M. dentiferum Thiv, M. hirtzii Dodson, M. mirabile,
M. paraense and M. saraca-taquerense. Besides M.
chasei, other four species of M. sect. Hirtzae occur
in Brazil: M. brasiliense, M. mirabile, M. paraense
and M. saraca-taquerense. It differs from these by
the entire lip, acute to obtuse apex, without callous
and by the apex of the clinandrium and anter minutely
denticulate.
The leaf surface of M. chasei presents thick and
brown reticulations over the green blade (Dodson
& Bennet 1989), a texture that is more evident in
individuals living in places with higher exposition to
the sun light.
ConsErvation – data dEFiCiEnt (dd): known only from
one collect in Brazil, lack of additional individuals
from the site and neighboring regions (IUCN 2010).
aCKnowlEdgMEnts. We thank to Companhia Paranaense
de Energia (COPEL) for allow and encourage the publication
of the data of this work. Consórcio CIA Ambiental and staff
are warmly acknowledged. We also thank Carla A. Royer
for her help with the bibliography.
litEraturE CitEd
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FigurE 3. Distribution map of Macroclinium chasei. Circle:
previous records. Asterisk: current record.
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372 LANKESTERIANA

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