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19-01-2021 15:09

Khomenko Igor Khomenko Igor

Hi, On spruce (Picea) needles, small, white disco

09-01-2021 21:07

Khomenko Igor Khomenko Igor

Hi,Is this just a long spore variation of Hymenosc

19-01-2021 10:27

Enrique Rubio Enrique Rubio

Could this synnematous hyphomycete be a Spiropes s

14-01-2021 18:36

Edvin Johannesen Edvin Johannesen

Apothecia up to 0,5 mm, on decayed wood of Populus

18-01-2021 17:35

Andgelo Mombert Andgelo Mombert

Bonsoir, Tout d'abord, toutes mes excuses pour le

17-01-2021 17:45

Joaquin Martin

Hi, I have found this tiny Ascomycete on pinus sy

15-01-2021 20:43

Enrique Rubio Enrique Rubio

This pyrenomycete grew inconspicuously on Ulex woo

26-01-2020 09:52

Riet van Oosten Riet van Oosten

Hello, Found by Gerrit Reitsma on Juncus effusus,

17-01-2021 18:24

Archie McAdam

The asco was a small greyish disco growing on the

18-01-2021 11:34

Karl Gumbinger

Dear mushroom friends,I got a piece of bark from a

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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

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). 

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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