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05-06-2020 06:41

Jérôme MAFFERT

Bonjour, il semble bien que Tuber aestivum Vitt. s

06-06-2020 23:06

Garcia Susana

Hola, Estos apotecios crecian sobre un tallo de

04-06-2020 18:28

Malcolm  Greaves Malcolm Greaves

HelloCan someone help with this long necked flask

05-06-2020 13:53

Peter Thompson

Hello Everyone,I would be interested in your opini

06-06-2020 17:17

Robin Pétermann

J'ai également trouvé ce Lachnum sur Filipendula

06-06-2020 20:25

Juuso Äikäs

I know next to nothing about these kinds of fungi

06-06-2020 19:03

Robin Isaksson Robin Isaksson

Found this mycogaena on populus on smooth twigs in

06-06-2020 16:48

Robin Pétermann

Bonjour,j'ai trouvé ceci sur tige morte de Filipe

06-06-2020 07:19

Juuso Äikäs

These were growing on a dead, fallen stem of Filip

05-06-2020 19:29

Mirek Gryc

Hi! I am convinced that I have already seen these

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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.