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01-06-2025 09:37

Charles Aron Charles Aron

Hi All, I found this Octospora growing with liver

06-07-2025 19:36

Castillo Joseba Castillo Joseba

me mandan el material de Galicia (España) recolec

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

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Small-spored Otidea
Juuso Äikäs, 16-09-2020 05:07
There was a group of small Otideas growing in a Picea abies dominated forest on needle debris. The biggest ones were about 2 cm high and they shot spores readily after slightly drying.

Spore measurements (spore print in water):


(10) 10.5 - 11.9 (14) × 6.2 - 6.9 (8.8) µm
Q = (1.5) 1.6 - 1.78 (1.8) ; N = 20
Me = 11.2 × 6.6 µm ; Qe = 1.7


Tips of paraphyses up to 6 µm wide.


I tried to figure out the species with the aid of the Otidea monograph but didn't come to any certain conclusion. My best guess is O. nannfeldtii and second one O. formicarum.


O. nannfeldtii apparently likes to grow on nutrient-rich, often calcareous soil. This place seemed to be acidic though, not nutritious.


O. formicarum typically grows on old ant hills but apparently can also grow on just needle debris. Maybe the dark warts on the outer surface speak against it? I haven't seen any pics or descriptions that include them for that species.


The last two microphotos are from a dried fruitbody in 3 % KOH.

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Viktorie Halasu, 17-09-2020 00:12
Viktorie Halasu
Re : Small-spored Otidea
Hello,

I think the ectal excipulum (cell walls) became yellow in KOH, did you consider O. tuomikoskii? In some collections, this reaction can disappear again in ca. 20 seconds, in others it stays. Also the intensity and placement of the yellow staining is variable. In nannfeldtii the surface exudates turn reddish brown, and it should have two-layered medulla (although I have a DNA-confirmed collection of nannfeldtii with 1-layered medulla too). 

Cheers,
Viktorie
Juuso Äikäs, 17-09-2020 14:55
Re : Small-spored Otidea
I returned to the place and now the biggest apo was 3.5 cm long. There was a yellow reaction with KOH (a slice under 100X magnification in the pic)! Also when I put a drop of KOH on the apo and put a paper on it, there was yellow pigment in it. 

Because of the small size and lack of noticing the yellowing, I didn't consider O. tuomikoskii but with this new info I think you are correct! The ecology would also fit better, this one is apparently much more common and less demanding of habitat that O. nannfeldtii.

Thank you.
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