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01-06-2025 09:37

Charles Aron Charles Aron

Hi All, I found this Octospora growing with liver

05-07-2025 12:38

Åge Oterhals

I found this pyrenomycetous fungi in pine forest o

04-07-2025 20:12

Josep Torres Josep Torres

Hello.A fungus growing on the surface of a trunk o

20-06-2025 08:33

Josep Torres Josep Torres

Hello.Small, blackish, mucronated surface grains s

28-06-2025 16:00

Josep Torres Josep Torres

Hello.A tiny fungus shaped like globose black grai

04-07-2025 12:43

Castillo Joseba Castillo Joseba

me mandan el material seco de Galicia (España) 

03-07-2025 18:40

Castillo Joseba Castillo Joseba

me mandas el material seco de Galicia (España) re

03-07-2025 20:08

Francois Guay Francois Guay

I found this interesting yellowish asco growing on

01-07-2025 23:37

Josep Torres Josep Torres

Hello.A Pleosporal symbiotic organism located and

02-07-2025 17:26

Yanick BOULANGER

BonjourRécolté sur une brindille au fond d'un fo

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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.