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16-05-2020 12:30

Hans Halbwachs

Dear all, I have found quite a few spores in Balti

18-12-2019 13:39

Peter Thompson

Hello Everyone,I have found what appears to be an

24-05-2020 22:36

Joop van der Lee

The reason why I post all these different characte

28-05-2020 11:45

Hardware Tony Hardware Tony

Found this hairless orange operculate fungi larges

28-05-2020 21:28

Marek Capoun

Hello everybody,I need help with a determination o

27-05-2020 00:13

Carbone Matteo

Dear all,my friend Emanuele Campo sent this pdf to

27-05-2020 17:31

Peter Thompson

Hello Everyone,I have found two leaves of Berberis

28-05-2020 16:23

Vasileios Kaounas Vasileios Kaounas

Found in leave of Quercus ilex. very small, less

28-05-2020 14:19

Vasileios Kaounas Vasileios Kaounas

Found 28-05-20, in forest with Quercus ilex and Pi

28-05-2020 10:46

Josep Torres Josep Torres

Hola. Aunque no es el Foro más adecuado para el t

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greenish 1-septate spores, saccate asci
Ethan Crenson, 11-06-2019 00:08
Hello all,

I found a few of these tiny black cushions on a branch last weekend in a cemetery in New York.  They grew on the same branch as the Orbilia and Barbatosphaeria barbirostris which I posted about earlier.  They are smaller than 1mm diameter, sessile, gelatinous in texture. The asci are saccate.  The spores 1-septate, greenish in color and measure 16-21 x 8-10µm.  In the photos you will see that they appear to be growing in a white subiculum, but I am not certain that it relates to these apothecia.  Any ideas?

Thank you in advance.

Ethan
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Hans-Otto Baral, 11-06-2019 07:39
Hans-Otto Baral
Re : greenish 1-septate spores, saccate asci
You need to apply diluted Lugol to see the iodine reaction (possibly lateral wall red, apical wall a thick blue cap, then it is a Dactylospora, now called Sclerococcum.
Ethan Crenson, 11-06-2019 18:46
Re : greenish 1-septate spores, saccate asci
Zotto,

Thank you.  When you said diluted Lugol's I didn't realize that it had to be very diluted.  My first three mounts were rubbish.  This series of images shows the section mounted in extremely dilute Lugol's to which I gradually added a less dilute solution.  I think I see the faint reddish tint on the ascus wall (indicated with an arrow).  The blue reaction at the apex of the ascus is hard to miss.

Ethan
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Ethan Crenson, 11-06-2019 18:47
Re : greenish 1-septate spores, saccate asci
Here's the picture a little closer...
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Hans-Otto Baral, 11-06-2019 20:21
Hans-Otto Baral
Re : greenish 1-septate spores, saccate asci
Indeed, this is a Lecanoromycete and in all lichens the reaction is very strong. But it is possible by strong squashing to see the details.
Non-lichenicolous species are difficult to identify. Are you sure with the big spore size? Usually spores are smaller.
Ethan Crenson, 11-06-2019 22:37
Re : greenish 1-septate spores, saccate asci
In fact I did read the wrong notes when I transcribed the spore size. My apologies. Spores measure: 9-11 x 4-5µm.