Accès membres

Mot de passe perdu? S'inscrire

16-06-2019 11:54

Nicolas VAN VOOREN Nicolas VAN VOOREN

Hello.Here is a Hymenoscyphus species growing on b

16-06-2019 12:07

Riet van Oosten Riet van Oosten

Hello, Found by Theo Westra, 13-06-2019 (The Neth

14-06-2019 15:32

Malcolm  Greaves Malcolm Greaves

A small group of Perithecia on rotten (salix?) woo

14-06-2019 09:40

Per Marstad Per Marstad

I have found this in Norway, on hardwood, laying o

14-06-2019 06:40

Django Grootmyers

What is this parasite of Cantharellus minor? Found

11-06-2019 01:49

Valencia Lopez Francisco Javier

Hola amigos...Adjunto fotos de unas supuestas Para

11-06-2019 00:32

Elisabeth Stöckli

Bonsoir, Sur feuilles de ronce (Rubus/roncier à

11-06-2019 16:20

Garcia Susana

Hola, He recolectado este asco sobre estiercol, c

12-06-2019 22:42

Ethan Crenson

Hello all, A friend noticed these tiny fruiting b

11-06-2019 00:08

Ethan Crenson

Hello all, I found a few of these tiny black cush

« < 1 2 3 4 5 > »
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
  • message #58101
  • message #58101
  • message #58101
  • message #58101
  • message #58101
  • message #58101
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
  • message #58111
  • message #58111
  • message #58111
  • message #58111
Ethan Crenson, 11-06-2019 18:47
Re : greenish 1-septate spores, saccate asci
Here's the picture a little closer...
  • message #58112
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.