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01-03-2017 17:18

Enrique Rubio Enrique Rubio

Hi to everybodyCould you help me with a pdf copy o

18-09-2020 09:28

Viktorie Halasu Viktorie Halasu

Hello,this looks like Lophodermium petiolicolum, e

18-09-2020 12:45

Joaquin Martin

Hi,A colleague gave me this Pyrenomycete on Fagus

18-09-2020 10:15

Zugna Marino Zugna Marino

Buon giorno a tutti i colleghi.la specie che, a pr

18-09-2020 10:14

Zugna Marino Zugna Marino

Buon giorno a tutti i colleghi.la specie che, a pr

17-09-2020 11:07

Joop van der Lee Joop van der Lee

Normally Pilobolus are found on horse dung but thi

17-09-2020 09:19

Joop van der Lee Joop van der Lee

Found P. oedipus on horse dung yesterday.A perfect

17-09-2020 18:55

Juuso Äikäs

These were growing on a fallen trunk of a decidous

17-09-2020 19:38

Juuso Äikäs

I found these growing on a pile of dung in a fores

17-09-2020 17:53

Angel Pintos Angel Pintos

Hello anybody can provide this?Arx. Gen. Fungi Spo

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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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