Siggi_Hartmeyer

Full Members
  • Content count

    211
  • Joined

  • Last visited

  • Days Won

    5

Siggi_Hartmeyer last won the day on January 8 2016

Siggi_Hartmeyer had the most liked content!

Community Reputation

31 Excellent

Contact Methods

  • Website URL
    http://www.hartmeyer.de
  • ICQ
    0

Profile Information

  • Gender
    Male
  • Location
    Weil am Rhein - Germany
  • Interests
    Our CP collection and private CP-video production

Recent Profile Visitors

3,718 profile views
  1. Siggi_Hartmeyer

    The smallest flowering D. serpens

    Such early flowering of Arachnopus species is usually a sign that something with the conditions is not ok, and the plantlet often withers after that "emergency-flowering". The reason may be either not enough nutrition from the beginning or too cool temps. Try to feed the plant and it will grow on if the temperature/light conditions are fine.
  2. Siggi_Hartmeyer

    Catapulting Sundew

    Enjoy the amazing prey capture of a catapulting sundew. Short and succinctly (75 ms) but sensational. Meanwhile, we provide more than 120 thrilling videos on carnivorous plants on our (private and uncommercial) YouTube channel. Simply subscribe to stay up to date.
  3. Siggi_Hartmeyer

    Untangling the Indian Sundew muddle - Video

    Even in 1753, Linnaeus described the Indian Sundew (Drosera indica) officially. In our film, we are especially happy to show the herbal records that existed at that time with the kind permission by the Trustees of the Natural History Museum London (GBR) and the Naturalis Biodiversity Center in Leiden (NLD). Despite their different appearance, between 1753 to 2001 all spider leg sundews (Drosera section Arachnopus) occuring from Africa over Asia to Australia were identified as D. indica. Some early attempts to assign plants as separate species, such as by Planchon in 1848, failed because the distinguishing characteristics were not considered sufficient and/or reliable. Eventually in 2017, we were able to examine also the micromorphology of the "real" D. indica and found emergences, which were obviously misinterpreted and/or ignored in the existing literature. Until today, the spider leg sundews are often confused and therefore incorrectly labeled in botanical gardens as well as private collections. With our film "Untangling the Indian Sundew Muddle" we hope to be helpful to assign D. indica correctly. We are very grateful for the kind support by taxonomy expert Dr. Jan Schlauer, for the provision of seeds from the "real" D. indica by Gideon Lim and the photos of D. barrettiorum by Holger & Anja Hennern.
  4. Our movie "Prey Capture by Dionaea muscipula" is based on the same named CPN article (June 2017) by Emeritus Professor Stephen E. Williams and Siggi Hartmeyer. What captures Dionaea in cultivation compared with the natural habitat in North Carolina? How does it attract prey? Is UV-reflection and/or fluorescence used for attraction? Did it even develop a strategy to capture preferred larger prey animals than small ones? Well, it looks like that, but how does it work? Simply enjoy our documentary and find the answers. A HD-movie in the German language with English subtitles. Kind regards, Siggi & Irmgard.
  5. Bladderworts (Utricularia) possess the fastest capture mechanism of all carnivorous plants. Ultrafast bladder traps suck in prey within less than a millisecond. That is 100 times faster than Venus’s flytrap snap shuts. Seven of the ten species that occur in Europe can be found in the region between Lake Constance, Swabian Alb and the Alps. Thanks to the support of the worldwide recognized CP-expert Dr. Jan Schlauer, we were able to film all seven Utricularia at their natural habitat. The terrific speed of prey captures show recordings with a high-speed camera, taken at the labs of the Plant Biomechanics Group of the Botanical Garden of the Albert-Ludwigs-Universität Freiburg (Germany). Dr. Simon Poppinga kindly provided these remarkable shots. In addition, a scanning electron microscope image featuring the quadrifid glands inside a bladder trap (both published in Poppinga et al. (2016). AoB PLANTS 8: plv140). As the film shows, their shape can be helpful for the determination of several quite similar looking species. Detailed information on our domestic bladderworts is provided by the scientific article “Die Gattung Utricularia in Bayern” (2014) published by the Bavarian Botanical Society, from which we quoted repeatedly in this film. To protect the partly endangered plants, but also because the access to some of the swamp areas without an experienced guide is not at all harmless, we do explicitly not mention exact locations. Our film provides English subtitles. Enjoy!
  6. Our new film "The Realm of Emergences" shows the history and the currently most detailed description of the spider leg sundews (section Arachnopus) by their different emergences in an entertaining fashion. With D. hartmeyerorum, Dr. Jan Schlauer split the first species from D. indica for its unique morphology in 2001. Criticized by some experts at that time, today we can say with certainty that the plants in this section can actually be distinguished by their emergences, even if their function is often not known. Only the characteristics of the emergences of D. hartmeyerorum have been unequivocally proven. They function as optical lenses, which light up bright yellow even under a red laser beam. In D. cucullata we find structures that appear like ant abdomens and when the German couple Holger & Anja Hennern discovered a sundew with ice-lolly emergences in 2008, even the experts were amazed. These and further emergences that appear even more fascinating beneath the microscope help to identify the plants that have been distinguished from D. indica so far. Those who have seen this film should not have problems with naming the plants any more.
  7. Siggi_Hartmeyer

    Drosera x ultramafica white Flower yellow centre

    What hybrid is D. x ultramafica ? I think this name is given to the species D. ultramafica. Who "created" this hybrid name and what are the parent plants?
  8. Siggi_Hartmeyer

    Drosera Binata var Dichotomoa?

    It looks like the normal D. binata "T-form".
  9. Siggi_Hartmeyer

    D. Peltata in trouble!

    Did you order the plants from Australia? In case, you must know that the plants must first change their growing rythm, before they grow easily. They would start to thrive now in Down Under; however, after they got accustomed to European seasons they will thrive in October and go dormant in April/May. Therefore new imported plants from Down Under have usually problems during the first seasons.
  10. Siggi_Hartmeyer

    Laser experiments with D. hartmeyerorum

    Our experiments suggest that the yellow emergences of Drosera hartmeyerorum act like a residual light amplifier, comparable to the eyes of crocodiles or cats when illuminated with a torch at night. The film provides our experiments with different light sources like halogen and red laser. CAUTION: Laser beams are dangerous. Protect your eyes when you conduct such tests, especially when you observe the laser through a magnifier. https://www.youtube.com/watch?v=g8pOZKg0clg Meanwhile I received on YouTube, Facebook and by e-mail the same question: What benefit has the plant from these emergences ? Well, the incident sunlight is white and the reflected light is (flickering due to movement in the wind) bright yellow. That is very attractive to insects, especially on a strong contrasting dark red background, which appears black to insects. Yellow flypapers are very effective and often used to trap flying pests in nurseries and on fruit trees. The dark red background appears black to insects because their visual ability is shifted to the short-waved range of the spectrum. They don't see red, but they are able to see UV patterns. Regarding these facts, the emergences, which developed from simple sticky tentacles, are perfectly designed to lure prey into the sticky plant center.
  11. Siggi_Hartmeyer

    Leaf cutting of Drosera regia?

    Yes, it is possible. Place the leaf in Sphagnum inside a plasic bag. Avoid direct sun and wait for about 2-3 weeks and several adventive sprouts will appear.
  12. Siggi_Hartmeyer

    D. indica and relatives

    The above plant with red emergences is now called Drosera cucullata, not D. indica and not D. serpens. It sounds funny, however, with the new names no D. indica exists in Australia anymore. Only in Asia ... maybe in Africa. That does not mean, that D. indica cannot be there, maybe it was just not found until now :-). Beside all confusing names: great photos Dieter!
  13. Siggi_Hartmeyer

    Wintergrowing africans

    D. cistiflora grows best with night temps between 1 and 8°C (day may be betwen 15-25°C). If you have no direct sun you'll need artificial light, however, 10 hours light should be sufficient.
  14. Siggi_Hartmeyer

    Drosera Adelae

    The color of the flowers depends mainly on light conditions and is not a characteristic of different genes. With a low light level the flowers remain green to orange, while the leaves become large and pale green. With direct sunlight the same plants produce dark red flowers and clearly smaller leaves. I have one clone of D. adelae in our tropical greenhouse and they all flower with different colors depending on their place. However, if you change the place the plants need a while to change the color of new produced flowers.
  15. Siggi_Hartmeyer

    This is multifida or not?

    D. binata "Black Heath" is self-pollinating and develops lots of seeds. The leaves are in between D. binata var. dichotoma and D. binata var. multifida, which both do not produce seeds if self-pollinated (the varieties in my collection).