Tephrocactus alexanderi and recurvatus
- Mike P
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- ralphrmartin
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Re: Tephrocactus alexanderi and recurvatus
Thanks Tony, Mike.
Then T alexanderi is going on the label.
The large one came as T. fiambalensis, by the way.
Coincidentally, I'm seeing Martin tomorrow, so I'll see what he has to say too...
Then T alexanderi is going on the label.
The large one came as T. fiambalensis, by the way.
Coincidentally, I'm seeing Martin tomorrow, so I'll see what he has to say too...
Ralph Martin
https://www.rrm.me.uk/Cacti/cacti.html
Members visiting the Llyn Peninsula are welcome to visit my collection.
Swaps and sales at https://www.rrm.me.uk/Cacti/forsale.php
My Field Number Database is at https://www.fieldnos.bcss.org.uk
https://www.rrm.me.uk/Cacti/cacti.html
Members visiting the Llyn Peninsula are welcome to visit my collection.
Swaps and sales at https://www.rrm.me.uk/Cacti/forsale.php
My Field Number Database is at https://www.fieldnos.bcss.org.uk
- Mike P
- BCSS Member
- Posts: 2801
- Joined: 26 Nov 2007
- Branch: CAMBRIDGE
- Country: UK
- Role within the BCSS: Branch Secretary
- Location: Forest Hill
Re: Tephrocactus alexanderi and recurvatus
There was some Tephrocactus ‘fiambala’ seed offered by the society a few years back from which I got one to germinate and grow on. It has very large segments with black spines a little like your plant. It’s actually going to flower this year so if I get to see it I’ll post a photo.
Mike
Secretary Bromley Branch
Secretary Bromley Branch
- Tony R
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Re: Tephrocactus alexanderi and recurvatus
Hi Ralph,
Some comments from my good French friend, Thomas Guerry:
Hi Tony,
I agree with you, Ralph's plant is a Tephrocactus alexanderi
T. recurvatus is characterized by curved spines and small segments (even if a few forms of T. alexanderi also have small segments) as you said, but another interesting feature of T. recurvatus is the large contact area between the segments : when making a cutting of recurvatus, it is hard to cut the segments as the diameter of the contact area between two segments is roughly half the diameter (or more) of the segment itself. For T. alexanderi the contact area is far less large, whatever the size of the segments.
It is also very easy to distinguish these two species by seeds because they are very different, but in cultivation it is very difficult to get seeds of T. recurvatus !
Hope this will help,
Thomas
________________________________________
Some comments from my good French friend, Thomas Guerry:
Hi Tony,
I agree with you, Ralph's plant is a Tephrocactus alexanderi
T. recurvatus is characterized by curved spines and small segments (even if a few forms of T. alexanderi also have small segments) as you said, but another interesting feature of T. recurvatus is the large contact area between the segments : when making a cutting of recurvatus, it is hard to cut the segments as the diameter of the contact area between two segments is roughly half the diameter (or more) of the segment itself. For T. alexanderi the contact area is far less large, whatever the size of the segments.
It is also very easy to distinguish these two species by seeds because they are very different, but in cultivation it is very difficult to get seeds of T. recurvatus !
Hope this will help,
Thomas
________________________________________
Tony Roberts
Treasurer, Haworthia Society
Chairman, Tephrocactus Study Group
Moderator, BCSS Forum
Kent
(Gasteria, Mammillaria, small Opuntia, Cleistocactus and Sempervivum are my current special interests)
Treasurer, Haworthia Society
Chairman, Tephrocactus Study Group
Moderator, BCSS Forum
Kent
(Gasteria, Mammillaria, small Opuntia, Cleistocactus and Sempervivum are my current special interests)
- ralphrmartin
- BCSS Research Committee Chairman
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- Joined: 11 Jan 2007
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Re: Tephrocactus alexanderi and recurvatus
Tony
label printed.
Please pass on my thanks to Thomas.
Fero - you can stick a label in yours too! Thanks again for such a nice plant!
Ralph
label printed.
Please pass on my thanks to Thomas.
Fero - you can stick a label in yours too! Thanks again for such a nice plant!
Ralph
Ralph Martin
https://www.rrm.me.uk/Cacti/cacti.html
Members visiting the Llyn Peninsula are welcome to visit my collection.
Swaps and sales at https://www.rrm.me.uk/Cacti/forsale.php
My Field Number Database is at https://www.fieldnos.bcss.org.uk
https://www.rrm.me.uk/Cacti/cacti.html
Members visiting the Llyn Peninsula are welcome to visit my collection.
Swaps and sales at https://www.rrm.me.uk/Cacti/forsale.php
My Field Number Database is at https://www.fieldnos.bcss.org.uk
- ralphrmartin
- BCSS Research Committee Chairman
- Posts: 6070
- Joined: 11 Jan 2007
- Branch: None
- Country: United Kingdom
- Role within the BCSS: Chairman - Research
- Location: Pwllheli
- Contact:
Re: Tephrocactus alexanderi and recurvatus
Martin reckoned it was Tephro alexanderi, the form which used to be called
Tephrocactus alexanderi ssp. bruchii
Tephrocactus alexanderi ssp. bruchii
Ralph Martin
https://www.rrm.me.uk/Cacti/cacti.html
Members visiting the Llyn Peninsula are welcome to visit my collection.
Swaps and sales at https://www.rrm.me.uk/Cacti/forsale.php
My Field Number Database is at https://www.fieldnos.bcss.org.uk
https://www.rrm.me.uk/Cacti/cacti.html
Members visiting the Llyn Peninsula are welcome to visit my collection.
Swaps and sales at https://www.rrm.me.uk/Cacti/forsale.php
My Field Number Database is at https://www.fieldnos.bcss.org.uk