Re: cotyledons revisited
>I looked in several books and found pictures of germinating Peperomia
>Sagitaria Allium and Yucca (all monocots) All named the structure
>connected with the seed and ending in the haustorium, the cotyledon.
>I could not find a single picture naming it otherwise. Could you give
>me the pages Joe were you did find it.
I'm not sure just what point you are trying to make here. In Plant
Anatomy by Katherine Esau, second edition, 1965 in 726 pages of text
and pictures the word haustoria is only mentioned once. I quote:
"Some plants develop highly specialized mechanisms of food absorption.
Various cells of the embryo sac, and also the endosperm and the
suspensor, may develop haustoria that penetrate into adjacent
tissues." I don't see what this has to do with cotyledons.
On page 726 there are several pictures of onion seeds showing embryo
development. One picture is a cross section of a fully developed seed
and the cotyledon is CLEARLY labled "cotyledon" with an arrow pointing
to the structure that is the cotyledon. Nothing is labled
>Raven and others too gives good definitions: Cotyledons are the
>structures that store food in dicots (like beans ) and absorbs food
>in most monocots. Just as I stated
This is something new to me. I searched through Esau and didn't find
anything that even comes close to saying anything like this.
>Joe states that the first leaf is the cotyl as it is already
>present in the embryo. If one looks under the microscope in a
>germinating hosta seed( as I did) no trace of a leaf can be found.
A germinating hosta seed doesn't have a leaf - it has a cotyledon!
Ben, would you please read Esau's Plant Anatomy, second edition and
please show me the portions that support your point of view. I've
been searching hard to find evidence that says you are correct, but as
hard as I try I can't find anything!
Also Ben, I understand you have some view about counting pods in
hostas that was mentioned on this robin some time ago. Can you
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