| Author | Message | ||
     Frankie Handoyo Rating: |
Dear All, I Attached the orange form to compare. Frankie  | ||
| Dr. Joseph Arditti Rating: N/A |
Wolfgang, The problem with seeds of temperate climate orchids is not so much temperature or medium or media requirements. It is a strong dependence on their mycorrhiza. They seem to have a very strong or even absolute requirement for penetration by a live fungus to germinate. That is why Mark had good luck with symbiotic germination. Some species are less demanding, but not by much. And, every now and then one medium or another will work with one or another species, but asymbiotic attempts are never as productive as one may wish. Seeds of tropical epiphytes do not have such requirements. They germinating easily on many media. The seeds of tropical (or nearly so) terrestrials are between these tweo extremes. That is why the seeds of Paphiopedilum require specialized media like Thomale GD medium or RE (Robert Ernst) medium which can be viewed as a modification of GD. If you can, isolate a fungus from the roots of this Dendrobium using Mark's methods and then try to use it to germinate their seeds also using Mark's methods. Good luck. | ||
| Wolfgang H. Bandisch Rating: N/A |
Joe, I can assure you that I have tried, many times, to germinate seed of Den. brevicaule and Den. dekockii. I had green two capsules of Den. brevicaule from the plant shown in the posted photo. I also tried dry seed of Den. dekockii. While I have never gotten into the finer points of media formulas I have used various recipes but none ever worked. I am somehow convinced that temperature may have something to do with successful germination. Although airconditioned our lab's room temperature is nowhere near what the temperatures are where these species occur. All other aspects of artificial propagation methods being tried and tested temperature is the only thing we cannot control to a great extent. The huge expense of getting to these orchids (only by helicopter) prevents us from getting more material to do some more work on thhis. Wolfgang | ||
| Dr. Joseph Arditti Rating: N/A |
Wolfgang's comment about germinating the seeds of Den. dekockii is very interesting. Seeds of terrestrial species from temperate (i. e., cold) climates are difficult to germinate. Prof. S. Ichihashi told me of a cold climate Japanese epiphytic species which is hard to germinate and now this one. I think that cold climate orchids, epiphytes or not, are the hardest of all to germinate in vitro. Mark Clements in Australia has had luck germinating temperate climate terrestrials symbiotically. Maybe his methods will work with cold climate epiphtes. Worth a try Wolfgang. You will contribute to science | ||
| Wolfgang H. Bandisch Rating: N/A |
and one of Dendrobium brevicaule  Wolfgang | ||
| Wolfgang H. Bandisch Rating: |
Here another one of my images of Den. dekockii from Mt. Albert-Edward.  Wolfgang | ||
| Wolfgang H. Bandisch Rating: N/A |
Here are some of my images of Den. dekockii from Mt. Albert-Edward.  | ||
| Wolfgang H. Bandisch Rating: N/A |
Steve, when you refer to a linked image on the PNG Image Gallery do NOT use the URL that appears in the address window after a search, like this one: http://gallery.orchidspng.com/displayimage.php?album=search&cat=0&pos=2 as this link would refer specifically to your search. Please refer to the "URL" link given below the displayed image, e.g. for Den. dekockii http://gallery.orchidspng.com/displayimage.php?pos=-477. One of the reasons why D. dekockii J.J. Sm. may not be found in cultivations would be that, to my knowledge, nobody has been successful in propagating this species from seed! The species is found at very high altitudes, I found it at 3,000 m. (10,000 feet) where temperatures often go below freezing at night and day temperatures reach the low 20's (that's degrees Celsius). That would be another difficult aspect to replicate in cultivation. Another species that is often found where D. dekockii occurs is Den. brevicaule and natural hybrids are supposed to have been found. Their natural habitat is at 2,700 - 3,800 m above sea level. I guess those two will stay on the wish list forever. Wolfgang | ||
| Peter Fowler Rating: N/A |
Certainly looks like cuthbertsonii. Small rugose leaves. Nice plant anyway. Peter | ||
| Stephen Kemp Rating: N/A |
It is my understanding that D. dekockii is generally not found in cultivation due to its rarity and its difficulty in culture (ie makes cuthbertsonii look easy)but I am happy to be corrected. The link I sent works for me but if you go to your original link in this thread and then click the Search tool at top right ofd the page, you will be able to search for and find the same dekockii photos I found and posted. the leaves of dekockii are slightly rugose Nev Howcroft sent me a pic of cuthbertsonii:  | ||
| Jean vazli Rating: N/A |
The link does not display photos but I have seen some more dekockii. It looks like it was the species sold last year, I have one that is reblooming and will take a picture. D. brevicaule looks like another one sold at the same time, but how to tell all these orange-flowered oxyglossum apart from each other ? | ||
| Stephen Kemp Rating: N/A |
Here are some more photos of Dendrobium dekockii http://gallery.orchidspng.com/displayimage.php?album=search&cat=0&pos=2 | ||
| Jean vazli Rating: N/A |
Thank you for your reply. Only a handful of plants had pimpled leaves, others were ranging from smooth to slightly rugose... | ||
| Stephen Kemp Rating: N/A |
The pimpled D. cuthbertsonii leaf is a very distinctive characteristic so I imagine if your leaves have pimples on them, it is D. cuthbertsonii. I think the plants in the photographs on the link you provided are Dendrobium dekockii | ||
| Jean vazli Rating: N/A |
Hello to all, In Germany, there was on sale last year some "dendrobium cuthbertsonii". They do not look like the plants I have from Equatorial Plants, and I have found an unidentified picture here : http://gallery.orchidspng.com/displayimage.php?album=4&pos=240 of exactly the same plants that were offered. Some others had taller pseudobulbs and 3 x 0.5 cm leaves. The last ones offered had tiny 2-5 cm rhizomes between miniature cuthbertsonii bulbs ( 1 mm) and small standard cuthbertsonii leaf. Flowers deep red and enormous, maybe 3-4 cm. Do you have the possible names of these species ? Thank you very much Jean |
