[NatureNS] Spores vs. seeds

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Date: Wed, 04 Jun 2014 05:14:20 -0400
From: Gerald <naturens@zdoit.airpost.net>
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Dave,

Thanks for the delightful follow up. I need more time in the library.

--
Gerald

On 6/3/14, 21:14, David & Alison Webster wrote:
> Hi Again,
>    Yes I understood the question but I attempted to show that a
> bullet-proof definition is not readily possible. As with most words,
> usage and context define the meaning of a word. A first year Botany text
> and a Cryptogamic Botany text would fill in the necessary context.
>     I vaguely recall that when exposed to this 60+ years ago we learned
> about a few extinct or very rare plants that had highly modified leaves
> that were almost flower-like in function and bare ovules that gave rise
> to structures that were almost seeds etc.  And if such intermediate
> plants had not been recognized then they would have had to be postulated
> to be consistent with evolution.
> 
>    Precise definitions and Biology are like oil and water. I expect many
> pre-school
> children would tell you that 1/2 + 1/2 does not equal 2 but the
> terminology of  meisosis and mitosis says that when the chromosomes of a
> haploid cell fuse with those of another haploid cell then the product is
> diploid.
> 
>    Is a lichen an organism ?; no. Is it alive ?;yes. Can it reproduce ?;no.
> It is way past my bedtime.
> Yt, Dave Webster
> 
> 
> ----- Original Message ----- From: "Gerald" <naturens@zdoit.airpost.net>
> To: <naturens@chebucto.ns.ca>
> Sent: Tuesday, June 03, 2014 6:29 PM
> Subject: Re: [NatureNS] Spores vs. seeds
> 
> 
>> Dave,
>>
>> Thank you for the reply. I was reading Lichens of North America when I
>> got confused about seeds versus spore. I did not make clear I wanted a
>> text that explained seeds and spore.
>>
>> My difficulty is that a definiton such as yours, similar to those I
>> found elsewhere, is equivocal. I'm an amateur at this. The definitions I
>> found led me to conclude some seeds are spores and some spores are
>> seeds, and some seeds are not spores and some spores are not seeds. That
>> is, seed vs. spore is not a dichotomy.
>>
>> -- 
>> Gerald
>>
>> On 6/2/14, 20:25, David & Alison Webster wrote:
>>> Hi Gerald & All,                            June 2, 2014
>>>    Mainly a seed (at least a typical seed) is a multicellular non motile
>>> product of sexual reproduction and has differentiated structures such as
>>> cotyledons, plumule and radicle whereas spores can be single-celled or
>>> multicellular, the haploid sometimes motile participants of sexual
>>> union, or diploid cells or clusters of cells that are generated
>>> following this union or asexual diploid cells that are just shed under
>>> some conditions like a specialized single-celled botanical dandruff.
>>> Many 'primitive' organisms are able to generate resting spores,  when
>>> conditions become adverse, so they can survive otherwise lethal
>>> conditions.
>>>    The above are distinct from the various multicellular diploid
>>> packages for vegetative propagation that are split off from lichens,
>>> mosses, liverworts and some vascular plants.
>>>
>>>    Brodo, Sharnoff and Sharnoff (Lichens of North America) is a recent
>>> book with good illustrations but difficult to use because species are
>>> arranged in alphabetical order so closely related genera, that might
>>> readily be confused, are scattered.
>>> Yt, Dave Webster, Kentville
>>>
>>> ----- Original Message ----- From: "Gerald" <naturens@zdoit.airpost.net>
>>> To: <naturens@chebucto.ns.ca>
>>> Sent: Monday, June 02, 2014 6:41 PM
>>> Subject: [NatureNS] Spores vs. seeds
>>>
>>>
>>>> Hi,
>>>>
>>>> I am learning about lichens. I am starting with spores (decided they
>>>> came first). I am trying to understand the difference between a seed
>>>> and
>>>> a spore. I'm not even sure there is a difference. Answers or a good
>>>> text
>>>> suggestion welcome.
>>>>
>>>> Thanks
>>>>
>>>> -- 
>>>> Gerald
>>>>
>>>>
>>>> -----
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>>>>
>>>
>>
>>
>> -----
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> 

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