ABSTRACT: Many species of Orchids have been discovered, and added to the list of the orchids of Brazil and the Amazon region through the research of João Batista Fernandes da Silva and included in the list of new Orchids from Brazil and from Amazon region. The Genus Acacallis Lindley, proposed in 1853, had been reduced in two species by G. Pabst in his work "Orchidaceae Brasilienses". The field research conducted by João Batista Fernandes da Silva has been able to prove the validity of some species of Acacallis that had been put into synonym, and to discover news species of Acacallis such as Acacallis rosariana. |
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This new species
was found in 1989 by the Museo Gueldi researches, U. Maciel and Carlos
da Silva Romario in a flooded region in the Forest Reserve of Samuel,
Jamari River, close to the city of Porto Velho in the State of Rondônia.
In 1998, João Batista Fernanades da Silva found this new species
again in large quantities growing in Buriti palms, in a flooded region
of the "Parque Estadual de Corumbiara", on the Mequém
River, a tributary on the right (north) side of the Guaporé River
in the State of Rondônia. |
Acacallis rosariana V. P. Castro & J. B. Silva sp.nov. TYPE: BRAZIL: Rondônia: Mun. Porto Velho. 50- 100m de altitude, collected, in 18/01/89, by U. Maciel and Carlos da Silva Rosário, No. 1643. (HOLOTIPO MG No. 133092). |
Specii
Acacallis Cyanea Lindl. similis, sed folis longioribus et minus latis,
pseudobulbis cooptatioribus, floribus ¾ magnitudibus, petalae et
sepalae minus magnae, 3/4 latis petalis, labelo ¾ magnitudi, labelli
callorum in prior pars cum 3 cornua. |
Herb
epiphytic. Roots thin, white, glabrous, issuing from the internode of the
rhizome. Rhizome evident. Pseudobulbs oboval-elongate, apex acute, initially
coveredclouted by the leaf bases that later are shed, 1 apical leaf; 3.6-5.0cm
long and 1.2-2.0cm wide. Leaves oblanceolate, 30cm long and 6.0-7.0cm wide.
Inflorescence emerging from the axial sheaths of the developing pseudobulb,
25cm long with to 6-10 flowers. Floral bract triangular-elongate, acute,
3-4mm long. Flower very showy, with spreading open segments, sepals and
petals, internally white, externally pale blue, lip purple, callus white
with purple spots at the base; total lip, 5cm between the sepals. Sepals,
dorsal, lanceolate, apex acute, narrowed at the base, concave, 3.5cm long
and 2.2cm wide; laterals, oblanceolate, asymmetric, concave, apex acute,
3.5cm long and 2.2cm wide. Petals circular, narrowed at tha base, slightly
concave, 2.5cm long and 2.0cm wide. Lip spreading, narrowed base; the frontal
part saccate in the intersection with the callus, semicircular 1.6cm long
and 2.1cm wide when flattened; callus multi-toothed with 3 acute frontal
teeth and 2 small ones (horns shaped teeth) attached at the sides of the
callus; 2 triangular auricles, acute, the total length lip 2.5cm. Column
erect, slightly arched, auricles ligulate and large, 1.8cm long. Anther
subquadratic, biloculate. Pollinia 4. Stigmatic cavity triangular. |
ETMOLOGIE. Related to the Researcher Mr. Carlos Samuel Rosário, from the "Museo Gueldi". |
At the
first apparance, this seems to be Acacallis Cyanea Lindl, but a closer examination
there are a number of differences, that we can point out: Acacallis rosariana
has pseudobulbs more clustered than those of Acacallis cyanea, leaves longer
and narrower, inflorescence developing from immature pseudobulbs, smaller
flowers, with petals noticeably circular and smaller, lip shorter and smaller,
callus multi-toothed (Acacallis cyanea callus is uniforme and serrulated)
with 3 acute frontal teeth. |
Bibliography |
Rua Vicente Galafassi, 549 - Bairro Nova Petrópolis, S.B. do Campo
- CEP - 09770-480, SP, E-mail: vpcastro@terra.com.br Trav. 14 de Março, 894 - apto. C-101 - Bairro Umarizal - Belém, PA - CEP - 66.055-490, E-mail: jbfdasilva@zipmail.com.br |
Photo: Vitorino Paiva Castro Neto - Illustration: Marcos Antonio Campacci |