Observation 204143: Placidium A. Massal.
When: 2015-05-09
Who: zaca
No herbarium specimen

Notes: Growing on calcareous rock among moss.


Microscopy: Section.
Microscopy: Section displaying an immersed perithecium with legend.
Microscopy: A thicker section.

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Thanks, J-Dar,
By: zaca
2015-05-13 11:40:43 PDT (-0700)

for being so enthusiastic and, of course, by the compliment.

Good enough for a field guide!
By: J-Dar
2015-05-13 06:18:40 PDT (-0700)

Seriously, or more appropriately, a text book. Thanks for the info, that’s incredible.

Hi J-Dar,
By: zaca
2015-05-13 03:57:06 PDT (-0700)

Still there or you are out to buy a microscope … (Ahahah).
The photo of the microscopy shows a section of the thallus displaying an immature fully immersed perithecium even without visible ostiole.
Note that in the genera Catapyrenium and Placidium the perithecia don’t have Involucrellum – a typically a shield-like layer of hyphae around the ostiole of a perithecium, usually distinctly pigmented and frequently carbonized. I uploaded a new photo with a legend to the diverse parts shown in the photo where I also include other elements not shown in the first photo: a pigmented ostiole, asci and a spore.

What is the section showing?
By: J-Dar
2015-05-12 20:59:03 PDT (-0700)

Can you let us know what the microscopy section is of? It may be obvious, but those of us learning would greatly appreciate all the info you have to share. Thanks Zaca.

Created: 2015-05-10 07:03:11 PDT (-0700)
Last modified: 2015-05-13 05:37:12 PDT (-0700)
Viewed: 71 times, last viewed: 2016-10-24 11:52:27 PDT (-0700)
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