Rebutia ID please?

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Paul D
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Re: Rebutia ID please?

Post by Paul D »

ralphrmartin wrote: Tue May 10, 2022 5:52 pm There are certainly a lot of imposters about for albipilosa - unless you consider it to be extremely variable. While it's usually supposed to be an extreme form of A. fiebrigii, to me, this flower looks to have more in common with A. heliosa.
I think A. albipilosa might be a prime candidate for what we were talking about the other day Ralph, off forum- everyone wants plants which have extremely long, fine white spines and I think anything that doesn't match that is discarded or seen as being "not true". So, unwittingly, perhaps, artificial selection is going on. Certainly when I grow this plant from seed I get a fair range of different spine lengths and density of areoles.
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Re: Rebutia ID please?

Post by edds »

I've much less experience of Rebutia than both of you, but I've noticed this year as my seedlings are getting to flowering size and in better light they are getting much better spines. I noticed it today in some Aylostera buingiana especially. The news spines are twice the length of previous ones and fierce!
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Re: Rebutia ID please?

Post by SimonT »

I think the controversy over R./A. albipilosa goes back to when it was first isolated - summarised http://www.rebutia.sk/idents/albipilosa.htm. It has even been suggested in the past that some are of "horticultural origin". I'm not sure this controversy has ever been resolved? I'd like an albipilosa plant to come close to the translated formal description of the type, which I actually got from Paul's site https://www.rebutia.org.uk/aylostera-al ... scription/. The spines are described as "spines, hairlike, soft, white, generally curved, 10 – 15mm long, central spines, if present, a little stronger, 2 – 4cm long, with a reddish brown base". Sounds good to me!
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Re: Rebutia ID please?

Post by el48tel »

I'm not an expert either. But I have noticed that flower coloration this year is different. I have three Rebutia marsoneri. I recorded and reported that they had different colours .... yellow ... tending towards orange ..... tending towards red. This year the first two are almost identical deep yellow.
Light? Temperature? Extent of watering? Extent of feeding? Compost?
Endeavouring to grow Aylostera, Echinocereus, Echinopsis, Gymnocalycium, Matucana, Rebutia, and Sulcorebutia. Fallen out of love with Lithops and aggravated by Aeoniums.
Currently being wooed by Haworthia, attempting hybridisation, and enticed by Mesembs.
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Re: Rebutia ID please?

Post by ralphrmartin »

Temperature can certainly effect flower colour. There are any number of articles about how yellow flowered Xmas cacti don't come out as advertised if kept at the "wrong" temperature. Also, I have noticed some plants have differently coloured (and sized) flowers from year to year, depending on conditions.
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Re: Rebutia ID please?

Post by Paul D »

Here is an Aylostera atrovirens pic I took this morning. These two flowers are on the same body! One of them opened for the first time this morning, the other is yesterday's flower.
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Aylostera atrovirens young plant sm.jpg
Paul in North-east Scotland (Grampian Branch BCSS)
National Collection Rebutia, Aylostera & Weingartia (inc. Sulcorebutia). Also growing a mixture including Ferocactus, Gymnocalycium, Lobivia, Mammillaria, Lithops, Gasteria, Haworthia.
http://www.rebutia.org.uk
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Re: Rebutia ID please?

Post by el48tel »

@PaulD
The changes across the day even with an open flower can be wide.
I wonder if pollinated vs. unpollinated makes a difference. Across the season certainly makes a difference. But ..... I did notice the other day while purchasing some plants, that the angle of illumination and viewing does make a difference. Scattered light from particulate matter in the petals versus reflected light versus transmitted or absorbed light. Pure physics! Add to this the change in the chemistry in the petals because of what has been absorbed in the feed, and you have an interesting project. It's on my to do list.
Endeavouring to grow Aylostera, Echinocereus, Echinopsis, Gymnocalycium, Matucana, Rebutia, and Sulcorebutia. Fallen out of love with Lithops and aggravated by Aeoniums.
Currently being wooed by Haworthia, attempting hybridisation, and enticed by Mesembs.
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