Nothostele acianthiformis

Nothostele acianthiformis
Systematics
Family :	Orchids (orchidaceae)
Subfamily :	Orchidoideae
Tribe :	Cranichideae
Sub tribus :	Cranichidinae
Genre :	Emergency hostel
Type :	Nothostele acianthiformis
Scientific name
	Nothostele acianthiformis
	( Rchb. F. & Warm. ) Garay

Nothostele acianthiformis is a plant from the genus Nothostele within the family of orchid (Orchidaceae). This endemic occurs only in the central part of the Brazilian state of Minas Gerais . It was the only species of the genus Nothostele until 2011 as the second species Nothostele brasiliaensis J.ANBat., Meneguzzo & Bianch. was first described, occurs only in the southern part of Brazil.

description

Vegetative characteristics

Nothostele acianthiformis is a relatively small, perennial herbaceous plant that grows clumpy. Nothing is known about roots and leaves . The plant specimens are leafless at flowering time.

Generative characteristics

The slender and upright inflorescence stem is covered with some translucent bracts and in the upper area it is hairy glandular. The flowers stand together in a loose, not one-sided, racemose inflorescence .

The relatively small flowers are not resupinated . The ovary is stalked, cylindrical and not twisted. The hermaphrodite flowers are zygomorphic and threefold. The bracts are white with a green lip . The sepals are wide spread. The dorsal sepal is concave, fused at the base with the filament of the single stamen . The lateral sepals are curved, attached to the base of the column , with this forming a short sack that rests against the ovary. The petals are asymmetrically shaped, curved, clinging to the dorsal sepal. The lip is wedge-shaped at the base (not nailed), there with thickened edges, rhombic in outline. The column is roughly horizontal, it is slender and somewhat hairy. It extends well beyond the point of attachment on the ovary (columnar foot). The scar consists of two very close together or even completely united surfaces that point forward. The stamen is oval to elongated with a bent back, blunt tip. The stamen is not completely fused with the stylus . The stamen contains four club-shaped pollinia that hang over stalks (caudiculae) on a small, round adhesive disc ( viscidium ). The stamen is partially surrounded by tissue of the column (clinandrium), this forms a narrow, transparent edge that is not fused with the stamen. The dividing tissue between the stamen and the stigma (rostellum) is long and flat, triangular in outline, tapered towards the front, with turned up edges.

Occurrence

Nothostele acianthiformis occurs in southeastern Brazil at altitudes of 1400 meters.

Systematics and botanical history

Warming published a drawing of this type as early as 1869. The first description , together with Reichenbach , was then published in 1881, under the generic name Pelexia . Cogniaux placed this species in the genus Stenorrhynchos in 1895 , and Hoehne in Centrogenium . The genus Nothostele was established in 1982 by Leslie Garay . The generic name Nothostele is made up of the Greek words νόθος nothos for "fake, false", and στήλη stele for "column"; it refers to the free stamen.

Nothostele acianthiformis was classified within the tribe Cranichideae by Garay in the Subtribus Spiranthinae , later publications placed them in the Subtribus Cranichidinae and more recent publications again in Spiranthinae.

supporting documents

Leslie A. Garay: A generic revision of the Spiranthinae . In: Botanical Museum Leaflets of Harvard University . tape 28 , no. 4 , 1982, pp. 339-340 .
Alec M. Pridgeon, Phillip Cribb, Mark W. Chase, Finn Rasmussen (Eds.): Genera Orchidacearum. tape 3 : Orchidoideae , Part 2: Vanilloideae . Oxford University Press, New York / Oxford 2003, ISBN 0-19-850711-9 , pp. 40-43 .
Specimen details. In: CV Starr Virtual Herbarium. The New York Botanical Garden, accessed November 24, 2009 .

Individual evidence

↑ ^a ^b Rafaël Govaerts, P. Bernet, K. Kratochvil, Günter Gerlach, G. Carr, P. Alrich, AM Pridgeon, J. Pfahl, MA Campacci, D. Holland Baptista, H. Tigges, J. Shaw, PJ Cribb , A. George, K. Kreuz, J. Wood: World Checklist of Orchidaceae. 2010, Royal Botanic Gardens, Kew. In: Rafaël Govaerts (Ed.): Nothostele. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved April 4, 2020.

Web links

Wikispecies: Nothostele acianthiformis - species directory

[WCSP-1] Rafaël Govaerts, P. Bernet, K. Kratochvil, Günter Gerlach, G. Carr, P. Alrich, AM Pridgeon, J. Pfahl, MA Campacci, D. Holland Baptista, H. Tigges, J. Shaw, PJ Cribb , A. George, K. Kreuz, J. Wood: World Checklist of Orchidaceae. 2010, Royal Botanic Gardens, Kew. In: Rafaël Govaerts (Ed.): Nothostele. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved April 4, 2020.