South America – Hermetospheres

Vivipary in two Gesneriads

In viviparous plants, the embryo grows sufficiently to emerge visibly from within the seed tissues before dispersal (Farnsworth 2000: 108). The number of plant species for which vivipary belongs to the usual form of reproduction in their natural habitats is relatively small. However, in some plant species where this form of reproduction is unusual, vivipary…
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The blue iridescence of the red Selaginella

Iridescence is the name of shimmering blue metallic colors of certain plants that appear to change as the angle of view changes. You can find out how it is produced in Selaginella erythropus, why it cannot be seen with the bare eye and how unusual this is in the plant kingdom. Before that, it is…
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Tuberous miniature Sinningias

Mini sinningias are popular terrarium plants. With their geophytic life cycle, are they also suitable for the hermetosphere with its steady conditions? Information on the natural habitat, experiences from growers and an experiment should provide some insight.
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Two great naturalists and a miniature plant

It is hard to imagine a plant more inconspicuous than Selaginella microphylla: tiny leaves on a uniform, branched shoot, monochromatic green, without flowers. Nevertheless, it was collected in 1801 or 1802 during an expedition through the rough wilderness of the northern Andes, carefully labelled, preserved, transported to the Pacific coast and shipped to Europe together…
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Hoehne’s Begonia

For some tropical plants that have a reputation for being difficult to grow in culture, the hermetosphere is just what it needs. This seems to be the case for this small Begonia from São Paulo province in Brazil. According to one of the most experienced Begonia growers today, B. hoehneana is “a species that is…
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Death and the hitchhiker fern

Sometimes, when things look bad, it pays to simply wait and see if things change for the better. I have already described an experience of this kind (Death and resurrection). There is a similar story to tell today. A 5l container inspired by the flora of Costa Rica was set up on April 2023 with…
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“Climbing stag’s tongue with scaly stems”

This fern is not only visually very appealing, it also has other characteristics that make it an ideal plant for hermetospheres: small size, slow growth and a preference for a permanently warm and humid environment. The fact that it is widespread throughout tropical America indicates that it does not make any exceptional demands in order…
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Efficient light capture with downsized leaves?

The unequal growth of two leaves in a pair from a single branch node is called anisophylly. It occurs in several, non related groups of Angiosperms that have opposite leaves, like Gesneriaceae, Melastomataceae, Rubiaceae and Urticaceae and is therefore assumed to have evolved independently several times. But what is the competitive advantage of this trait…
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The dwarf Microgramma

“Microgramma C.Presl is a fern genus of approximately 30 species in the family Polypodiaceae, all occurring in the Neotropics except one occurring in Africa. They are rhizome-creeping epiphytes, growing from trunk bases to the canopy, with a few species also able to grow in rocky or terrestrial habitats. They occur preferentially in wet tropical forests…
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Avoid blurring

Hermetospheres can have a high aesthetic value. If that is part of the motivation behind them, one is tempted to capture the beauty photographically. However, objects behind glass are difficult to photograph. Depending on the optical quality of the glass from which the container is made, the object will appear more or less blurred. My…
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Category: South America