A Few Sections From Old Blocks

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mrsonchus
Posts: 4175
Joined: Tue Feb 03, 2015 9:42 pm
Location: Cumbria, UK

A Few Sections From Old Blocks

#1 Post by mrsonchus » Fri Feb 08, 2019 11:55 pm

Hi all, I've been practicing my staining of late and have been sectioning some old wax-blocks I have in my boxes of Coleus and Sunflower leaves in TS.

Here is a section of a coleus (the coloured kind kept as houseplants) leaf, sectioned at 8µ (too thin really for good structure) and stained with Safranin & Fast-green stains. Mounted in 'Omnimount' resinous mountant.

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A couple of close-ups of sectioned glandular trichomes of the leaf,
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and
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Back in 2017 (June/July I think) I sectioned longitudinally more coleus through the growing-tip to show the meristem (the 'growing tip') where new cells are added to the plant's stem and the emerging leaf and branch primordia are seen developing. I thought some may find them interesting. The staining is again Safranin and Fast-green....

A whole stem-tip, LS,
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closer-in and then labelled,
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That which I've labelled branch primordia I now believe (with 2 more years under the belt) to be leaf-edges of leaves orientated at a 90 deg anfle on the stem to the obvious ones.... Still not sure though,
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The stem is quite nice as it's square, here's a section (TS) of one, a very hairy plant indeed!
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Hope you like them, great fun staining, still masses to learn though. :)

John B.
John B

ChrisR
Posts: 138
Joined: Tue Jun 14, 2016 11:01 pm
Location: Surrey, UK

Re: A Few Sections From Old Blocks

#2 Post by ChrisR » Sat Feb 09, 2019 12:18 am

Super!

Hobbyst46
Posts: 4277
Joined: Mon Aug 21, 2017 9:02 pm

Re: A Few Sections From Old Blocks

#3 Post by Hobbyst46 » Sat Feb 09, 2019 9:37 am

Very nice and interesting. What is the function of the small hairs along the stem ?

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