Polypodium vulgare

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Guppy
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Polypodium vulgare

Post by Guppy »

Hi

A sorus is a collection of sporangia (spore containers) on the underside of the ferns' leaves.
Here at the angelsweet (German), the thin skin, the Indusium (veil) falls off during the ripening.
In many fern species the cracked skin remains as disturbing shreds and does not allow a view of all spore containers.

Good to see are also see the stomata and some transparent "hair", whose name and function I do not know.

Image
http://files.homepagemodules.de/b649264 ... rmfLxw.jpg

Kamera: Nikon D500
Objektiv: Laowa 25mm F 2.8, 2.5-5X Ultra Macro
Belichtungszeit: Blitz
Blende: 2.8
ISO: 100
Beleuchtung: 4 Blitzgeräte
Diffusor: Schreibpapier (60g)
Aufnahmedateiformat (RAW/JPG): RAW
Beschnittsbetrag in % (Breite u. Höhe): 0, 0
Stativ: Reprostand
Artenname: Engelsüss, Polypodium vulgare
Multishot-Technik: Stack
Stacking Software / - Methode: Zerene Stacker / PMax
Abbildungsmassstab: 7:1
Objektseitige Bildbreite (mm): 3.36
Stacktiefe (mm): 0.84
Anzahl Stackschritte: 84
Durchschnittliche Stackschrittgrösse (mm) mit Cognisys StackShot: 0.01

Kurt

MarkSturtevant
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Re: Polypodium vulgare

Post by MarkSturtevant »

Very nicely done.
Mark Sturtevant
Dept. of Still Waters

micro_pix
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Re: Polypodium vulgare

Post by micro_pix »

Excellent!

Dave

Pau
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Re: Polypodium vulgare

Post by Pau »

Very nice!
This is one of my favourite subjects.
I am seeing it in a poor laptop but the white balance seems too blueish.
...and some transparent "hair", whose name and function I do not know.
They are called trichomes (the general name for plant hairs)
Pau

Guppy
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Re: Polypodium vulgare

Post by Guppy »

Hi Pau
The white balance is a bit too blue, I love it. :wink:
I was not sure if they are really trichomes and if they are called that in the fern.

Thanks a lot

Kurt
Last edited by Guppy on Wed Aug 12, 2020 1:07 pm, edited 1 time in total.

lothman
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Re: Polypodium vulgare

Post by lothman »

Hallo Kurt,
Guppy wrote:
Tue Aug 11, 2020 6:27 am

Kamera: Nikon D500
Objektiv: Laowa 25mm F 2.8, 2.5-5X Ultra Macro
....
Abbildungsmassstab: 7:1
how did you achieve 7:1 with the Laowa 2,5-5x macro lens. Did you add more extension?

regards
Lothar

Guppy
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Re: Polypodium vulgare

Post by Guppy »

Hi Lothar

I use the Laowa 25mm F 2.8, 2.5-5X Ultra Macro on the Nikon bellows PB-6,
here at 7:1 with the minimum extension of 50mm.

Image scale / approx. resolution of the object
3:1 / 320 LP/mm
4:1 / 380 LP/mm
5:1 / 450 LP/mm
6:1 / 490 LP/mm
7:1 / 530 LP/mm
8:1 / 550 LP/mm
10:1 / 560 LP/mm
Up to 7:1, the resolution increases visibly; at even higher image scales, the resolution no longer increases visibly.

Kurt

lothman
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Re: Polypodium vulgare

Post by lothman »

Hi Kurt,
very interesting (especially since I have this lens since two days)

if it can go up to 10:1 it would be interesting how far it could go down to 1:1 before vignetting/degradation starts. Of course the lens then had to be disassembled in order to place the lens closer to the sensor. On mirror-less bodies there would be the chance to do so.

iconoclastica
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Re: Polypodium vulgare

Post by iconoclastica »

Guppy wrote:
Tue Aug 11, 2020 6:27 am
the thin skin, the Indusium (veil) falls off during the ripening.
In many fern species the cracked skin remains as disturbing shreds and does not allow a view of all spore containers.
No indusia in Polypodium. The genus has for long been characterized by their absence.

The yellow colour and contrasting annulus suggest this might be P. interjectum rather than vulgare. Count the number of basal cells between the annulus and the stalk to be sure.
--- felix filicis ---

Guppy
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Re: Polypodium vulgare

Post by Guppy »

Many thanks for the correction.
"the thin skin, the Indusium (veil) falls off during the ripening."
Sorry, it's my fault.
Polypodium vulgare is the appointment of a gardener, (probably quick and dirty?).

Kurt

iconoclastica
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Re: Polypodium vulgare

Post by iconoclastica »

Image
Two or three pale cells between the coloured annulus cells and the stalk is interjectum (as above). One means vulgare. It's not the easiest, but certainly the most consistent character to tell the two species apart.
--- felix filicis ---

Guppy
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Re: Polypodium vulgare

Post by Guppy »

Can you determine the species with this picture?

Image

thanks a lot
Kurt

iconoclastica
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Re: Polypodium vulgare

Post by iconoclastica »

Guppy wrote:
Fri Aug 14, 2020 2:00 am
Can you determine the species with this picture?
Not with certainty, for I can't discern the cell walls very well. But here is my interpretation:
Untitled-1.jpg
Two to three basal cells, fitting for P. interjectum. That is corroberated by the other characters (low number of annulus cells, oval sorus, colours as said above), so it's a name given with some confidence. I expect the leaf is long-triangular (not parallel sided), with acute segments that have shallow teeth along the margins. However, these macroscopic characters are notoriously unreliable...
--- felix filicis ---

Guppy
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Re: Polypodium vulgare

Post by Guppy »

I hope I'm understanding this correctly.
1 - 2 basal cells = P. vulgare
2 - 5 basal cells = P. interjectum
Since on my picture 2 and also 3 basal cells are visible, it is probably P. interjectum!
But the maximum spore length is 77µm, which indicates P. vulgare?

Thanks a lot
Kurt

iconoclastica
Posts: 317
Joined: Sat Jun 25, 2016 12:34 pm
Location: Wageningen, Gelderland

Re: Polypodium vulgare

Post by iconoclastica »

Guppy wrote:
Fri Aug 14, 2020 5:04 am
I hope I'm understanding this correctly.
1 - 2 basal cells = P. vulgare
2 - 5 basal cells = P. interjectum
Since on my picture 2 and also 3 basal cells are visible, it is probably P. interjectum!
But the maximum spore length is 77µm, which indicates P. vulgare?

Thanks a lot
Kurt
basal cells:
vulgare 1; interjectum (1–)2–3(–4); cambricum (2–)3–4(–5). This is a reliable character and can be observed with a few sporangia.

annulus cells:
vulgare (7–)11–14(–18); interjectum (4–)7–10(–13); cambricum (2–)4–18. This is a statistic character and must be observed as an average of many sporangia. The overlap is great. As a general rule: many narrow cells: vulgare; few wide cells: cambricum; interjectum being intermediate.

spore size:
vulgare (54–)56–68(–72); interjectum (70–)74–88(–90); cambricum (60–)62–74(–78)µm. This is a statistic character and must be observed as an average of many spores. BUT: spore size varies with the treatment, especially the mounting medium. The volume increase in glycerin can easily exceed the difference in average spore size between the species. To make matters worse, in many literature the pre-measuring treatment of the spores is not reported. The figures cited here are from the best literature source I could find for this area, but I do not know the mounting medium and it still presses upon me that I will have to measure them myself using a repeatable standard procedure.
When measuring spores to distinguish between various ploidy races, which is a good thing to do!, I always recommend to measure plants from different taxa and compare the averages rather than to use literature figures.
--- felix filicis ---

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