10-06-2026 23:08
éric ROMERO
Bonjour tous, Je vous propose un Mollisia trouvé
10-06-2026 12:54
Steve ClementsBonjour encore, Pouvez-vous m'aider, s'il vous pl
09-06-2026 18:32
Camille MertensSur morceau de roseau immergé 0,5 - 0,7 mm de dia
10-06-2026 21:16
François Freléchoux
Bonsoir,Le dernier du jour, en attendant votre avi
10-06-2026 21:07
François Freléchoux
Toutes les tiges de gentianes jaunes de l'an passÃ
10-06-2026 13:41
François Freléchoux
Bonjour à nouveau, Voici une trouvaille d'hier.
10-06-2026 11:53
Steve ClementsBonjour, This disco is abundant on dead stems of
10-06-2026 10:45
François Freléchoux
Bonjour à nouveau, Encore une détermination qui
08-06-2026 10:16
Spooren Marco
I don`t have a clou about this fungus,it is not in
10-06-2026 09:24
François Freléchoux
Bonjour, J'imagine que cette détermination ne do
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
Hans-Otto Baral,
11-06-2019 07:39
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
Ethan Crenson,
11-06-2019 18:47
Re : greenish 1-septate spores, saccate asci
Here's the picture a little closer...
Hans-Otto Baral,
11-06-2019 20:21
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.
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.