Theo Damen

Theo Damen
Independent scholar

About

14
Publications
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308
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Introduction
Theo Damen currently works at Independent scholar. Theo does research in Botany and Systematics (Taxonomy) with special interest for the genus Dracaena.

Publications

Publications (14)
Chapter
Volume 54 of Flore du Gabon treats the Dracaenaceae (authored by Theo Damen and Joost van der Burg), the Gentianaceae (by Paul and Hiltje Maas) and the Lentibulariaceae (by Eberhard Fischer and Andreas Fleischmann). A total of 132 very nicely illustrated pages (46 botanical illustrations and 17 photo pages), dealing with 60 species in total. It can...
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Forest undergrowth plants are tightly connected with the shady and humid conditions that occur under the canopy of tropical forests. However, projected climatic changes, such as decreasing precipitation and increasing temperature, negatively affect understory environments by promoting light‐demanding and drought‐tolerant species. Therefore, we aime...
Article
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In preparing the treatment of Dracaena for Flore du Gabon and Flore d’Afrique centrale, a relatively high number of taxonomic and nomenclatural novelties were discovered; these are presented here. Within Dracaena five species and one forma are described as new, D. bushii, D. haemanthoides, D. marina, D. wakaensis, D. waltersiae and D. laxissima for...
Article
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Background: Understanding the patterns of biodiversity distribution and what influences them is a fundamental pre-requisite for effective conservation and sustainable utilisation of biodiversity. Such knowledge is increasingly urgent as biodiversity responds to the ongoing effects of global climate change. Nowhere is this more acute than in species...
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The tropical vegetation of Africa is characterized by high levels of species diversity but is undergoing important shifts in response to ongoing climate change and increasing anthropogenic pressures. Although our knowledge of plant species distribution patterns in the African tropics has been improving over the years, it remains limited. Here we pr...
Article
Full-text available
The tropical vegetation of Africa is characterized by high levels of species diversity but is undergoing important shifts in response to ongoing climate change and increasing anthropogenic pressures. Although our knowledge of plant species distribution patterns in the African tropics has been improving over the years, it remains limited. Here we pr...
Article
Full-text available
During a recent survey of Atlantic central African orchids, we collected four orchid specimens in Rio Muni (Equatorial Guinea) that share the general morphology of Angraecum gabonense, the most frequent member of Angraecum section Pectinaria in Central Africa, but differ in leaf shape and flower size. Further inspection of specimens deposited at th...
Article
Full-text available
During a recent survey of Atlantic central African orchids, we collected four orchid specimens in Rio Muni (Equatorial Guinea) that share the general morphology of Angraecum gabonense, the most frequent member of Angraecum section Pectinaria in Central Africa, but differ in leaf shape and flower size. Further inspection of specimens deposited at th...
Article
Full-text available
Growing in lower planting density, rose plants produce more assimilates, which can be used to produce more and/or heavier flowering shoots. The effect of planting density was investigated during a period including the first five flowering flushes of a young crop. In a heated greenhouse two cut-rose cultivars were grown under bent canopy management....
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Transmission of solar radiation by a multispan Venlo-type glasshouse was measured at a height of 0.5 m below the gutters, using four tube solarimeters inside the glasshouse, mounted on a 3.8 m pipe which described half a circle around its middle in a horizontal plane every 8 min and rotated in the opposite direction during the following 8 min. Radi...

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Projects

Projects (5)
Project
The Flore d'Afrique centrale is a tool providing information on and assisting in the identification of Central African vascular plants. The region comprises the countries Democratic Republic of the Congo, Rwanda and Burundi (see map) which is estimated to hold around 11,000 vascular plant species. Fascicles are produced for each family in two series, one on ferns and fern-allies (série Ptyeridophyta) and one on seed plants (série Spermatophyta).
Project
In preparing the treatment of Dracaena for Flore du Gabon and Flore d’Afrique centrale, a relatively high number of taxonomic and nomenclatural novelties need to be published.
Project
The Flore du Gabon (Flora of Gabon) is a series of books devoted to describing the rich and splendid diversity of vascular plants in Gabon, and providing basic information on each species. As such, it is an indispensable tool for botanists, conservationists, ecologists, foresters, and all others interested in the flora of this country, with which they are able to identify the plants they encounter.