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 What do you think?

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Ralf

Ralf

Number of posts : 22
Age : 52
Location : Ellrich, Germany
Registration date : 2009-11-04

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PostSubject: What do you think?   What do you think? Icon_minitimeSat Nov 07, 2009 9:46 am

In my collection are some nameless plants, maybe you can help to identify it. My guess it's a M. rhodantha. Do you agree?

What do you think? 207%20Pflanzenk%f6rper

What do you think? 208%20Scheitel

What do you think? 209%20Bedornung

What do you think? 210%20Bl%fcten


Thanks so far for your help.

Adios Amigos
Ralf
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Tam

Tam

Number of posts : 416
Location : Rothesay, Isle of Bute, Scotland
Registration date : 2008-11-12

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PostSubject: Re: What do you think?   What do you think? Icon_minitimeSun Nov 08, 2009 2:59 pm

Hi Ralf,

I believe this could be M.polythele. M.rhodantha calls for 17 - 24 glassy white radial spines which this plant does not have.

Yours, Tam
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Ralf

Ralf

Number of posts : 22
Age : 52
Location : Ellrich, Germany
Registration date : 2009-11-04

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PostSubject: Re: What do you think?   What do you think? Icon_minitimeSun Nov 08, 2009 3:33 pm

Hi Tam,

sure, of course. Sometimes I've a plank before my head. The simple things are often to far away. Many thanks for your help.

Greetings
Ralf
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Shmuel



Number of posts : 11
Location : Jerusalem, Israel
Registration date : 2009-11-08

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PostSubject: Re: What do you think?   What do you think? Icon_minitimeMon Nov 09, 2009 7:55 am

Wow, M. polythele is sure variable. The dark spines are a lot like those of my M. polythele ssp obconella. That's one of my few cactus that came with a name because I bought it at a botanical garden here.

May I ask while on the polythele topic. I did not see M polythele nudum on Hugo's list here. Is it not a valid name?

Shmuel
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Chris43
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Chris43

Number of posts : 1718
Age : 76
Location : Chinnor, UK
Registration date : 2008-07-16

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PostSubject: Re: What do you think?   What do you think? Icon_minitimeMon Nov 09, 2009 10:15 am

Hi all,
First off, Mammillaria polythele ssp obconella is typically a yellowish brown spined plant, and the spines are rather more curved than typically is the case with ssp. polythele. So if you have a dark spined plant, it may not be obconella, but probably just polythele. I attach a photo of obconella ML004 for your comparison.

What do you think? Polyth10

M. polythele nudum is just a form, probably a horticultural sport, and as such doesn't warrant inclusion is a classification.

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Shmuel



Number of posts : 11
Location : Jerusalem, Israel
Registration date : 2009-11-08

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PostSubject: Re: What do you think?   What do you think? Icon_minitimeTue Nov 10, 2009 4:37 pm

Ralf, your polythele is gorgeous and your obconella is really beautiful, Chris.
Nice photos!

I really have to rethink my polythele's.
What I thought was M p polythele now seems to be more the obconella as you described above:
What do you think? 1514_mystery_2

Here is what was labelled obconella and probably now M p polythele:
What do you think? 1514_Mammilariamaybecarnea2_1

Just for the record, here is the "nudum" which I now understand is an inermis form of polythele. How would one write that? Mammillaria polythele "nudum"?
What do you think? 1514_mystery_1

These photos are a whole growing season ago - the plants are larger now - do they seem etiolated? They are on an east facing covered porch and get about 1 hour of very early direct sun.

Thanks again!

Shmuel
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Tam

Tam

Number of posts : 416
Location : Rothesay, Isle of Bute, Scotland
Registration date : 2008-11-12

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PostSubject: Re: What do you think?   What do you think? Icon_minitimeWed Nov 11, 2009 4:47 pm

For some growers M.obconella is species in its own right but for others it is a subspecies of M.polythele and should be written has M.poythele ssp obconella. The different is , of course, is the much longer spines in obconella.
Has for nudum and inermis these are both the same plant and could be said to be a cultivated variety and should be written as ' Nudum ' or ' Inermis '

Tam.
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