Vegetative anatomy and systematics of Triphorinae (Orchidaceae)

Autor:	Barbara S. Carlsward, William Louis Stern
Rok vydání:	2009
Předmět:	Systematics Orchidaceae Velamen Xylem Plant Science Plant anatomy Anatomy Root hair Biology biology.organism_classification Plant morphology Botany Endodermis Ecology Evolution Behavior and Systematics
Zdroj:	Botanical Journal of the Linnean Society. 159:203-210
ISSN:	1095-8339 0024-4074
Popis:	Triphorinae represents a group of three anatomically simple genera, the structural features of which are unspecialized. The anomocytic stomatal pattern occurs in all genera; it predominates in Triphora. A foliar hypodermis, sclerenchyma, fibre bundles and stegmata are absent. The mesophyll is homogeneous. The exodermal and endodermal cells in the roots are entirely thin-walled and tilosomes are absent. However, there are anatomical modifications that appear to be unique: root hairs in Monophyllorchis are borne on velamenal buttresses and, in Psilochilus, they arise endogenously. In the root vascular system of Psilochilus, the metaxylem occurs as a circumferential band. The surfaces of stems in Triphora are tuberculate. Mycorrhizae appear to characterize the root cortices of all genera. © 2009 The Linnean Society of London, Botanical Journal of the Linnean Society, 2009, 159, 203–210.
Databáze:	OpenAIRE
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