2nd Conference 2017

2nd Conference 2017

Second Wild Orchids Conference

Dullstroom

Theme - 'Getting to know our orchids'

 

At the time of writing it is July 2016 and we have just passed the middle of winter. We have posted the WOSA 1 Conference proceedings on our website - wildorchids.co.za - under the heading 'Conferences',which make excellent reading and is a permanent record for researchers in the future. The conference turned out to be a grand affair with a number of exciting presentations and workshops. We have announced the dates for the WOSA 2 Conference and are arranging another interesting programme for delegates.

The WOSA website has been redesigned to make navigation easier and we are making a concerted effort to get all Provinces functioning which will enhance our footprint and activities. Jimmy Pauck is organizing KZN and Frans Waanders, Northwest Province with the Western Cape being handled by Greg Brill and Jim Holmes. Gerrit van Ede has completed the Flowers of Verloren Valei Field Guide which is a welcome addition to the promotion of indigenous orchids in South Africa. This will add a lot of interest and assist visitors during our field trips in January. We are also planning another 10 guided trips this summer.

Verloren Valei has a dedicated Friends group which is making a difference in its functioning and operation. They enjoy a section on our website under Conservation and are looking for members who wish to support them in the development of the Reserve.

The Gallery on the website has proved popular with over 14000 hits which consists of roughly 50% new visits and the same number of return visits. Gerrit is busy with providing the description of the orchids and Duncan McFarlane with populating the orchid photographs. To my knowledge this is the only electronic representation of indigenous orchids which perhaps explains its popularity.

The Conference will take place at the Dunkeld Country Estate on the Tonteldoos road, Dullstroom, 20 - 22 January 2017
Programme includes two Field Trips to Verloren Valei and a full conference programme covering topics such as ' South African orchids and the ' muti ' trade, and many more interesting topics.

Result of Field Trips during 2nd Conference 2017

Dullstroom

20th and 22nd January 2017

 

Orchid Hunting on the White Ridge

Notes:

1. Morphologically this cross appears to be between Disa versicolor and Disa rhodantha.

2. The McMurtry et al concept of Eulophia hians "aestivalis" form and Eulophia hians var. nutans is difficult to distinguish at this time of the year. Normally the "aestivalis" form on Verloren Valei flowers earlier and the spikes are short. I decided the plant my group saw was rather E. hians var. nutans, although the colour pointed to the "aestivalis form". Johnson et al would consider the plant as E. hians var. nutans.

 

Factors affecting flowering of the terrestrial orchids

A number of factors may influence whether a terrestrial orchid will flower or not.
Fire has been recorded as influencing and, in some cases, to be necessary for the flowering of some terrestrial orchids.
Whether the plant is large enough to flower is another factor.
Soil temperature during summer and winter may influence the initiation of flowers.
The past two seasons are of interest. Researching terrestrial orchids is not that easy. I think we should report what we found so that future researchers may benefit from our observations. The climate in the 2015 - 2016 summer was different from other years in that rainfall was considerably less than the average and summer temperatures were quite a bit higher than normal. I think the winter was also warmer than usual. This information should be available from the Reserve Management. Then in 2016 no blocks were burnt. Only the fire-breaks were burnt. The burning of the fire-breaks can be used to some extent, as control, but unfortunately the burning of the fire-breaks occur too early in the season - late autumn (May) or early winter (beginning June). Burning this time of the year may be detrimental to some, especially, later flowering orchids.

 

The following remarks are relevant in this context.

3. Disa rhodantha habitat is the edge of streams, marshes and wet grassland. Drought may influence the development of the new tuber. It may be too small to support flowering. I visited a number of the localities of D. rhodantha and found very few plants. As the localities are all wet, the lack of fire this season is most likely the reason why only a few plants flowered. However, two colonies were on a fire-break, but in wet grassland. Those colonies did not flower well. The grassland may have been too dry during the drought, affecting the development of tubers in that season. The warmer winter may also have influenced the initiation of flowering.

4. The Disperis wealei colony was a surprise. With over 30 plants in flower in a small area slightly away from its normal habitat - was really something to see. We did not find plants in flower along the Lunsklip River. This may be due to flooding of the river, which could clearly be seen in the grass along the river.

5. Very few of these two species - Satyrium hallackii subsp. ocellatum and Satyrium longicauda - were in flower. However, a lot of flower spikes could be seen. The impression however, is that it will be less than in 2016.

6. Schizochilus zeyheri normally grows along watercourses, marshes and seasonally wet grassland. Few flowering plants were seen in its normal habitat. However, we found a colony in a wet part of a fire-break. The colony was flowering well, indicating the importance of fire.

In summary, understanding the flowering of terrestrial orchids is a complex matter. In some cases dependence on fire could be derived and in other cases fire did not play a role in their flowering. Some species were more affected by the previous season's climate than other species, while others showed little effect.



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