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Vegetative anatomy and systematics of Triphorinae (Orchidaceae)

2009; Oxford University Press; Volume: 159; Issue: 2 Linguagem: Inglês

10.1111/j.1095-8339.2008.00930.x

1095-8339

Barbara S. Carlsward, William Stern,

Plant Parasitism and Resistance

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.