Hymenoscyphus s.l. ? - Forum ASCOFrance

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Hymenoscyphus s.l. ?

Edvin Johannesen, 14-09-2019 18:16

Rather large apothecia (up to 12 mm) on dead wood, slightly more ochraceous than the photos indicate, excipulum whitish, scurfy/warted. Stem lacking or rudimentary. Spores 17-18 x 5 microns, with several guttules at each end (in water), paraphyses cylindrical, multiguttulate.

Suggestions?

Thanks.

Edvin Johannesen, 14-09-2019 18:20

Re : Hymenoscyphus s.l. ?

Misroscopic features.

Hans-Otto Baral, 14-09-2019 21:23

Re : Hymenoscyphus s.l. ?

oh with so few data it is difficult. Phaeohelotium epiphyllum would be my guess, because the spores look homopolar, but at least the croziers should be verified.

Edvin Johannesen, 15-09-2019 00:37

Re : Hymenoscyphus s.l. ?

Thanks, I will have a closer look tomorrow. Can Ph. epiphyllum grpw on dead wood?

Michel Hairaud, 15-09-2019 08:18

Re : Hymenoscyphus s.l. ?

Hi Edwin, and Zotto,

Are the spores actually too long for H. conscriptus ?

AMitiés. Michel

Edvin Johannesen, 15-09-2019 11:19

Re : Hymenoscyphus s.l. ?

Here are some ascus bases, in water, phase contrast.

Hans-Otto Baral, 15-09-2019 21:47

Re : Hymenoscyphus s.l. ?

I don't think H. conscriptus, the spores are not scutuloid. Asci obviously have croziers. The pustules on the outside seem to me to fit epiphyllum. The apothecial stalk probably are always very short?

P. epiphyllum may grow on leaves and fruits as well as on all kinds of wood.

Edvin Johannesen, 16-09-2019 10:33

Re : Hymenoscyphus s.l. ?

Thanks a lot, Zotto. I will study the specimen in that context :)

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