Tephrocactus alexanderi and recurvatus

This forum is for discussion about small Opuntias, open to all.
User avatar
Mike P
BCSS Member
Posts: 2420
Joined: 26 Nov 2007
Branch: BROMLEY
Country: UK
Role within the BCSS: Branch Secretary
Location: Forest Hill

Re: Tephrocactus alexanderi and recurvatus

Post by Mike P » Mon Jun 21, 2021 7:35 pm

I agree with Tony.
Mike
Secretary Bromley Branch
User avatar
ralphrmartin
BCSS Member
Posts: 4696
Joined: 11 Jan 2007
Branch: None
Country: United Kingdom
Role within the BCSS: Member
Location: Pwllheli
Contact:

Re: Tephrocactus alexanderi and recurvatus

Post by ralphrmartin » Mon Jun 21, 2021 8:06 pm

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...
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 http://www.fieldnos.bcss.org.uk
User avatar
Mike P
BCSS Member
Posts: 2420
Joined: 26 Nov 2007
Branch: BROMLEY
Country: UK
Role within the BCSS: Branch Secretary
Location: Forest Hill

Re: Tephrocactus alexanderi and recurvatus

Post by Mike P » Tue Jun 22, 2021 7:33 am

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
User avatar
Tony R
Moderator
Posts: 3380
Joined: 20 Apr 2009
Branch: DARTFORD
Country: UK
Role within the BCSS: Branch Chair
Location: Hartley, LONGFIELD, Kent

Re: Tephrocactus alexanderi and recurvatus

Post by Tony R » Tue Jun 22, 2021 9:29 am

Hi Ralph,
Some comments from my good French friend, Thomas Guerry:

Hi Tony,

I agree with you, Ralph's plant is a Tephrocactus alexanderi :smile:

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
Chairman, BCSS Dartford Branch
Treasurer, Haworthia Society
Chairman, Tephrocactus Study Group
Moderator, BCSS Forum
Kent
(Gasteria, Mammillaria, small Opuntia, Cleistocactus and Sempervivum are my current special interests)
User avatar
ralphrmartin
BCSS Member
Posts: 4696
Joined: 11 Jan 2007
Branch: None
Country: United Kingdom
Role within the BCSS: Member
Location: Pwllheli
Contact:

Re: Tephrocactus alexanderi and recurvatus

Post by ralphrmartin » Tue Jun 22, 2021 4:07 pm

Tony

label printed.

Please pass on my thanks to Thomas.

Fero - you can stick a label in yours too! :grin: 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 http://www.fieldnos.bcss.org.uk
User avatar
Mike P
BCSS Member
Posts: 2420
Joined: 26 Nov 2007
Branch: BROMLEY
Country: UK
Role within the BCSS: Branch Secretary
Location: Forest Hill

Re: Tephrocactus alexanderi and recurvatus

Post by Mike P » Tue Jun 22, 2021 6:04 pm

So what did Martin say?
Mike
Secretary Bromley Branch
User avatar
ralphrmartin
BCSS Member
Posts: 4696
Joined: 11 Jan 2007
Branch: None
Country: United Kingdom
Role within the BCSS: Member
Location: Pwllheli
Contact:

Re: Tephrocactus alexanderi and recurvatus

Post by ralphrmartin » Fri Jun 25, 2021 4:42 pm

Martin reckoned it was Tephro alexanderi, the form which used to be called
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 http://www.fieldnos.bcss.org.uk
Post Reply