Accès membres

Mot de passe perdu? S'inscrire

22-08-2019 17:34

Stefan Blaser

Dear All, This collection from Fagus has globose

23-08-2019 07:46

Josep Torres Josep Torres

Hola.Un muy diminuto hongo creciendo sobre unas ho

22-08-2019 21:26

Castillo Joseba Castillo Joseba

Del pasado lunes  en tronca caido de fagusEstaba

21-08-2019 20:42

Simon Kennedy

As the historical records are no longer available

22-08-2019 18:35

Georges Greiff

Dear all,I have been going through herbarium speci

22-08-2019 16:24

Stefan Blaser

Dear All, The following collection looks similar

05-01-2019 14:57

Edvin Johannesen Edvin Johannesen

These orange "jelly"-like apothecia grow at the ap

21-08-2019 17:04

Mirek Gryc

Hello Grew among the roots of Phragmites.Fruitbod

21-08-2019 20:49

Joop van der Lee

I am looking for the following documentsMuroi, T.

21-08-2019 08:29

Tanja Böhning Tanja Böhning

Bonjour,   Encore un asco, que m´interesse, ma

« < 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.