09-11-2025 13:20
Josep Torres
Hello.A tiny ascomycete, appearing as erupting gra
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Francois Guay
I found this species in Quebec, Canada, on herbace
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Josep Torres
Hello.A suspected Hymenoscyphus sprouting on a thi
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Edvin Johannesen
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Edvin Johannesen
These tiny (0.4-0.5 mm diam.), whitish, short-stip
Perithecia on Cytisus scoparia
Marian Jagers,
23-03-2023 10:14
Found on dead twigs of Cytisus scoparia.Alone or in small groups, slightly immersed or erumpent.
Perithecia bright colored brown to brown, subglobose, ± 150-200 µm high en 160-200 µm wide, with a 500- 800 µm long neck, apex neck white.
Spores: 8-9,6 x 5-7 µm, smooth, initially colorless, mature (grey) brown, broadly ellipsoid, somewhat thickwalled and thicker at both ends.
Asci: hard to find, ± 38 x 12 µm, thinwalled, baring 8 irregularly arranged spores, amyloidy could not checked.
Parafysen: not seen.
Excipulum: looks like textura epidermoides mixed with ?
Does somebody recognize this species or its genus?
Kind regards,
Marian Jagers (The Netherlands)
Margot en Geert Vullings,
23-03-2023 15:44
Re : Perithecia on Cytisus scoparia
Am not an expert, but reminds me very much of a Melanospora I found recently?
Margot
Marian Jagers,
24-03-2023 17:25
Re : Perithecia on Cytisus scoparia
Hallo Margot,
Thanks for the suggestion. Your find of Melanospora chionea looks indeed similar. However, I also see some differences. So I assume it's a different species.
Kind regards,
Marian
Margot en Geert Vullings,
24-03-2023 18:52
Re : Perithecia on Cytisus scoparia
True Marian, I also do not mean M. chionae, but Melanospora in general.
M.chionae has quite short "beaks", there are other species like M. caprina that also have long "beaks like yours.
Yours look like older fruiting bodies because they also seem to have some green (algae) growing on them and they don't have the white fluffy anymore?
Kind regards,
Margot
Marian Jagers,
24-03-2023 20:52
Re : Perithecia on Cytisus scoparia
Margot,
At the moment about 30 perithecia are present. They all look fresh. Many of them bear a number of spores at the outside of their neck. They all lack a white tomentum or other hair.
The bark is partly covered with algae.
Assuming that the hyphae of the neck are irregularly arranged enough for a species of the genus Melanospora I used the key to the species in Marin-Felix et. al. Melanospora (Sordariomycetes, Ascomycota) and its relatives (2018). However it yielts no possible candidate.
Marian
