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Hymenoscyphus on Picea needles IKI-, H+

Khomenko Igor, 19-01-2021 15:09

Hi,

On spruce (Picea) needles, small, white discomycete fungi.
White stipitate apothecia around 1.5mm in diameter.
8-spored asci IKI- even after KOH, croziers(+), 92.7 - 96 × 7.42 - 7.7 µm;

Spores 10.2 - 12.8 x 3.1 - 3.9 µm; Q = 2.8 - 4; N = 30, Me = 11.6 x 3.6 µm

more pictures: https://inaturalist.org/observations/61427186

Microscopy is similar to Hymenoscyphus sulphuratus, but it is pure white and it was matured. Are there any other options?

Thanks you,
Igor

Hans-Otto Baral, 19-01-2021 16:55

Re : Hymenoscyphus on Picea needles IKI-, H+

At least I can say you need to turn all spores upside down :-)

Reminds me of Hymenoscyphus lutescens but that has amyloid asci and is on conifer wood.

Khomenko Igor, 19-01-2021 21:58

Re : Hymenoscyphus on Picea needles IKI-, H+

Thank you, Zotto,
I'm going to try to remember where a tail and a head are, but it is not that clear to me.

Hans-Otto Baral, 20-01-2021 08:42

Re : Hymenoscyphus on Picea needles IKI-, H+

I helotiales it is principally always so that the broader end is the upper end - for aerodynamical reasons ecause the spores are ejected one after the other. You can check this inside the asci.

Khomenko Igor, 20-01-2021 23:58

Re : Hymenoscyphus on Picea needles IKI-, H+

Thank you for explaining.
These spores remind me of a paramecium, so I always want to place the wider side down.

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