The Orchid Society of Thailand

The Orchid Society of Thailand The first society in Thailand which has devoted exclusively to orchids, established since 1959.

These are some examples of species look-alike hybrids: Vanda coelestis and its 75% genetic background hybrid, V. Five Fr...
26/07/2026

These are some examples of species look-alike hybrids: Vanda coelestis and its 75% genetic background hybrid, V. Five Friendships Pretty, and V. merrilli and its 75% genetic background hybrid, V. Naina. Please note that the flowers shown were specifically selected for their closest visual resemblance to the respective species.
These hybrids may cause confusion for CITES management authorities if specimens are accompanied by incorrect species identification.

To clarify further regarding the genetic background percentages shown on Orchidwiz and Orchidroots: these figures represent the average percentage for the entire cross, not the exact percentage for each individual seedling, which can vary.

For example, consider Vanda Naina:

Given that Vanda insignis has the genotype AABBCCDD and Vanda merrillii has the genotype aabbccdd.

The F1 hybrid between these two species—Vanda Lai Ming and Wai Chung Ng—will all have the genotype AaBbCcDd, meaning they are all exactly 50% V. insignis and 50% V. merrillii.

Now, if Vanda Lai Ming and Wai Chung Ng is crossed back to V. merrillii, the resulting progeny (Vanda Naina) can have one of two possible genotypes:

AaBbCcDd → which is 50% V. merrillii
aabbccdd → which is 100% V. merrillii

Taken together, the average genetic contribution from V. merrillii across all seedlings from this cross would be 75%, even though no single seedling actually has that exact percentage.

Please keep in mind that this example is a simplified model. The real genotypes are much more complex involving a lot more genes.
Furthermore, if the parent plants are polyploidy, the genetic composition becomes even more complex. In addition, if the parents are interspecific hybrids that have been selected to resemble one of their parent species, the actual genetic background of the offspring may deviate even further from the average percentage shown on websites such as OrchidWiz and OrchidRoots.

Photo Cr.: Orchidroots.com

On 24th June 2026, an application for a grex name registration by Saksit Simcharoen was accepted by the International Cu...
25/06/2026

On 24th June 2026, an application for a grex name registration by Saksit Simcharoen was accepted by the International Cultivar Registration Authority for Orchid Hybrids (R.H.S.). The cross, made by Saksit Simcharoen, is the hybrid between Vanda Kyra Green and Rhynchostylis gigantea. Its grex name is Vandachostylis Chang Sattapond.

O.S.T. would like to thank Saksit Simcharoen for his permission of using a photograph in this post.

On 15th June 2026, an application for a grex name registration by Prayut Kumtanom (ประยุทธ คำถนอม) was accepted by the I...
18/06/2026

On 15th June 2026, an application for a grex name registration by Prayut Kumtanom (ประยุทธ คำถนอม) was accepted by the International Cultivar Registration Authority for Orchid Hybrids (R.H.S.). The cross, made by Lt. Gen. Wesoot Kong–U–taikul, is the hybrid between Aerides crassifolia and Aerides Korat Koki. Its grex name is Aerides Koki Gen. Wesoot.

O.S.T. would like to thank Prayut Kumtanom for his permission of using a photograph in this post.

On 15th June 2026, an application for a grex name registration by Meesak Manee–in (Mee Sak MSorchid) was accepted by the...
18/06/2026

On 15th June 2026, an application for a grex name registration by Meesak Manee–in (Mee Sak MSorchid) was accepted by the International Cultivar Registration Authority for Orchid Hybrids (R.H.S.). The cross, made by Meesak Manee–in, is the hybrid between Vanda Renu Delight and Vanda General Prinya. Its grex name is Vanda NzzX Moonlight.

O.S.T. would like to thank Meesak Manee–in for his permission of using a photograph in this post.

On 14th June 2026, an application for a grex name registration by Worapot Kruesombat was accepted by the International C...
16/06/2026

On 14th June 2026, an application for a grex name registration by Worapot Kruesombat was accepted by the International Cultivar Registration Authority for Orchid Hybrids (R.H.S.). The cross, made by K. Worapot, is the hybrid between Vanda Mary Ellen and Vanda Kulwadee Fragrance. Its grex name is Vanda Cholthicha Stardust.

O.S.T. would like to thank K. Worapot for his permission of using photographs in this post.

On 12th June 2026, an application for a grex name registration by Saksit Simcharoen was accepted by the International Cu...
16/06/2026

On 12th June 2026, an application for a grex name registration by Saksit Simcharoen was accepted by the International Cultivar Registration Authority for Orchid Hybrids (R.H.S.). The cross, made by Saksit Simcharoen, is the hybrid between Papilionanda Josephine van Brero and Vandachostylis Wangyang Sim. Its grex name is Vanchoanthe Shera.

O.S.T. would like to thank Saksit Simcharoen for his permission of using photographs in this post.

On 8th June 2026, an application for a grex name registration by Saksit Simcharoen was accepted by the International Cul...
11/06/2026

On 8th June 2026, an application for a grex name registration by Saksit Simcharoen was accepted by the International Cultivar Registration Authority for Orchid Hybrids (R.H.S.). The cross, made by Saksit Simcharoen, is the hybrid between V. [Pda.] Yunnan Smile and Rhy. gigantea Its grex name is Vandachostylis Chang Nakhon Sawan.

O.S.T. would like to thank Saksit Simcharoen for his permission of using photographs in this post.

Congratulation to Tatuo Shimizu! This plant was displayed at the Okinawa International Orchid Show 2026 and caught an at...
02/06/2026

Congratulation to Tatuo Shimizu!
This plant was displayed at the Okinawa International Orchid Show 2026 and caught an attention from a O.S.T. merit award judge. The judge submitted a photograph of this plant to O.S.T. merit award judging committee to consider for a Judges' Commendation (J.C.) award. The plant got unanimous vote.

On 17th May 2026, an application for a grex name registration by Mink Sophonrat (OrchidsBy Mink) was accepted by the Int...
20/05/2026

On 17th May 2026, an application for a grex name registration by Mink Sophonrat (OrchidsBy Mink) was accepted by the International Cultivar Registration Authority for Orchid Hybrids (R.H.S.). The cross, made by Mink Sophonrat , is the hybrid between Phal. Nongkhae Sunset and Phal. violacea. Its grex name is Phalaenopsis Mink Happy Summer.

O.S.T. would like to thank Mink Sophonrat for his permission of using photographs in this post.

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