Catasetum taquariense Bicalho,

Barros & Moutinho (Orchidaceae),

a New Species From BrazilHAMILTON DIAS BICALHO,' FABIO de BARROS,2and JOSE LUIS de A. MOUTINHO NET03

In this work, the authors deseribe and illustrate a new speeies

of the orehid genus Catasetum L. C. Rieh. ex Kunth:

Catasetum taquariense Bicalho, Barr.os & Moutinho.

This speeies has been known for a fairly long time under

eultivation and comes from the states of Mato Grosso and

Minas Gerais, in Brasil.

Catasetum taquariense Bicalho, Barros & Moutinho, sp.

novo Epiphytieum; joliis membranaeeis, elliptieis, 3-n(;:rviiset

multi-nervulosis, aeuminatis, basin versum in pseudo-petiolum

angustatis, apieale ea. 24,0 em longae, 2,5 em latae,

inferioribus minoribus; racemo ereeto, in speeime nostro

8-floribus, ea. 13,0 em longo, seapo glabro; bracteis anguste

triangularibus, ea. 1,2 em longis, 0,3 em latis; floribus

maseulis ressupinatis, viride-flaveseentibus, vinaeeo-punetatis;

sepalis membranaeeis, ereetis, elliptico-laneeolatis, apice

breviter apiculatis, dorsali 3,5 em longae, 1,3 em latae,

lateralibus ea. 3,5 em longo, 1,4 em lato; petalis oblaneeolatis,

apiee breviter apiculatis, ea. 3,6 em longis, 1,3 em latis; labello

ambito subeordiforme, saeciforme, earnoso, trilobato, basi

leviter eordato, lobis lateralibus sub-ereetis, rotundatis,

margine serrulato-dentieulatis, lobo intermedio projeeto,

ligulato, margine retrorsa; toto labello explanato ea. 3,3 em

longo, 3,0 em lato; columna generis, apiee rostrata, ea. 3,0 em

longa; cirris parallelis, ea. 1,6 em longis, labelli saeeiformis

imo attingentibus; pedicelis teretis, ea. 2,0 em longis; flores

jemineis et capsula non vidi.

HOLOTYPUS: BRASIL - Mato Grosso do Sul; ad

margines rivuli Taquari, 11. 1980, eol. V.P. Castro s.n.

(HB70517)

PARA TYPUS: BRASIL - Mato Grosso do Sul; ad

margines rivuli Taquari, floruit in eultivatione, 11. IlI. 1981j

eol. E. L M. Catharino s.n. (SP I70302). Minas Gerais -

1Instituto de Botaniea. Present address: Instituto de Genetica,ESALQ/USP, CX. Postal 83, 13400 Piracicaba, SP, Brazil.

'Instituto de Botanica, CX. Postal 4005, 01000 Sao Paul,o, SP, Brazil.'Herbarium Bradeanum, Cx. Postal 15005, 20000 Rio de Janeiro, R.J. Brazil.

218

Cruzeiro da Fortaleza; Corrego do Jaeu, 31-V-1976, eol. M. F.

Silva s.n. (SPI75569).

ln the following English deseription, we have intermixed

observations and measurements obtained from plants other

than the Holotype.

Plant epiphytie. Roots fleshy, glabrous, white. Rhizome

very short. Pseudobulbs narrowly, ovoid, 11.0-13.0 em long,

3.5-3.7 em wide. Leaves membranaeeous, elliptie, aeuminate,

attenuate at base, with three main and many thin nerves; the

apiealleaves 22.0-24.0 em long, 2.5-4.5 em wide, diminishing

from apex to base. Raeeme ereet with 5-13 flowers, seape

glabrous with three membranaeeous, obliquely truneate, nar-

rowly triangular shoots 10.0 mm long and 4.0 mm wide. Male

flowers resupinate, sepals yellow-green, membranaeeous,

ereet, elliptieal-laneeolate, shortly apieulate, 3.2-3.5 em long,

1.2-1.5 em wide, the lateral sepals a bit smaller than the dorsal.

Petals oblong-laneeolate, shortly apieulate, 3.2-3.6 em long,

1.3- I. 7 em wide, entirely yellow-green and spotted with red-

brown. Lip sub-eordiform, saeeate, fleshy, trilobed, the base

rather eordate; laterallobes sub-ereet, rounded, with serrulate-

dentieulate margins; median lobe projeeted, ligulate, wit.h

retrorse margins, 3.0-3.3 em long and 2.5-3.0 em wide when

expanded, yellow-green, with red-brown spots and marks in-

ternally. Column typical, rostrate, 2.5-3.0 em long, cirrhi

1.3-1.6 em long, reaehing the depth of the lip eoneavity;

pedieel eylindrieal, 2.0 em longo Female flowers and eapsulesnot seen.

This speeies is closely related to C. spitzii Hoehne (1941)

from which it differs by the smaller flowers, the eolor of the

sepals and petals, the deep eoneavity of the labellum whieh has

no eiliate margins, the slightly thiek apieal lobe and the non

prominent ealosity.

The faet of the antenna-like projeetions of the eolumn

being par alIei and symmetrieal plaees this species in subseet.

Isoceras (Seet. Meizocatasetum) aeeording to the general

organization of the genus proposed by Mansfeld (1932).

Orch. Dig., Nov.-Dec. 1984

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FIGS. 1-8: Catasetum taquariense Bicalho, Barros & Moutinho. 1. General view; 2. flower infront view; 3. longitudinal section of the lip callus; 4. flower in lateral view; 5. longitudinalsection of flower; 6. fIower in lateral view; 7. mid-Iobe of the lip in back view; 8. mid-Iobe Mthe lip in lateral view. (1 and 2 from SP 170302; 3 and 4 from HB 70517 - HOLOTYPE: 5from SP 170318; 7 and 8 from living material).

Orch. Dig., Nov.-Dec. 1984 219

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FIG. 9: Map showing the known distribution of Catasetum taquariense Bicalho, Barros & Moutinho.

ACKNOWLEDGMENTS

We thank Dr. G. M. Barroso, Dr. H. F. Leitao Filho andE. Pereira for reviewing the Latin description; Mr. A. G.Burman for reviewing the English version; Ms. N. M. M. dosSantos for the illustrations, and Ms. E. G. Feitosa for her

typing. Fabio de Barros wants to acknowledge the grantreceived from Conselho Nacional de Desenvolvimento Cien-

tifico e Tecnológico (CNPq).

BIBLIOGRAPHY

HOEHNE, F. C. 1941. 4 orquidaceas el leguminosa novas

para a flora brasileira. Arq. Bot. Est. S. Paulo, n.s.,

1(3):61-63.

MANSFELD, R. 1932. Die Gattung Catasetum L. C. Rich.

Rep. Sp. novo Reg. Veg. 30:257-275.

Orch. Dig., Nov.-Dec. 1984