? (ID Request) - Yellow chunky asco a bit like a stubby Cudoniella

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Aciauda
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? (ID Request) - Yellow chunky asco a bit like a stubby Cudoniella

Post by Aciauda » Sat Aug 04, 2018 1:04 pm

It was very bright yellow in the woods, the colour of Bisporella citrina. The pictures here do not do justice to it. The one with dissecting microscope is nearest the correct colour. The biggest fruitbodies were 4.5 mm in diameter, growing on conifer wood.
1 Yellow asco gv 1.jpg
General view 1
1 Yellow asco gv 2.jpg
General view 2
2 Yellow asco closeup.jpg
Closeup
Cut into a section there is strong dextrinoid staining of the hymenium. It is about 50 μm thick. The asci 52 x 4 μm and Melzer positive.
3 Yellow asco section in Mlz.jpg
Section
The trama is of textura intrica hyphae.
4Yellow asco trama t intrica.jpg
Trama
The excipulum is of angular cells. At the edge they seem to be filamentous but those could be paraphyses I think.
5 Yellow asco excipulum 1.jpg
Excipulum 1
4 Yellow asco excipulum 2.jpg
Excipulum 2
The paraphyses have strong marking shown here first in water
6 Yellow asco 40 pph x 100 (1).jpg
Paraphyses in water 1
7 Yellow asco 40 pph x 100 (2).jpg
Paraphyses in water 2
and then in Melzer’s reagent; some paraphyses are forked
9b Yellow cudoniella-like pph in Mlz with ascus tip.jpg
Paraphyses in Melzer
9b Yellow cudoniella-like pph in Mlz with ascus tip.jpg
Paraphyses in Melzer

The spores have a single septum and are acute at the ends, not pointed. They measure 14-16x4-5 μm

mollisia
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Re: ? (ID Request) - Yellow chunky asco a bit like a stubby Cudoniella

Post by mollisia » Sat Aug 04, 2018 8:41 pm

Hello,

seems to be a Hymenoscyphus (Phaeohelotium) species.

best regards,
Andreas

Aciauda
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Posts: 26
Joined: Mon May 18, 2015 3:41 pm

Re: ? (ID Request) - Yellow chunky asco a bit like a stubby Cudoniella

Post by Aciauda » Sun Aug 05, 2018 1:44 pm

Many thanks for this, Andreas, I shall know where I should look again. You can see I am pretty incompetent at the keying out of ascos, so I am grateful for your help.

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