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Hymenoscyphus on Rubus
Chris Yeates,
15-11-2021 16:37
Bonjour
Continuing my work on fungi on Rubus I recently collected a small section of dead Rubus fruticosus stem with three long-stalked Hymenoscyphus apothecia.
Under the microscope at x400 these looked like typical H. scutula (H- 19.2-22.5 x 4.4-5µm), though I could see no evidence of cilia. With oil at x1000 the usual cilia one might expect were not seen, but almost every ejected spore had 2 (occasionally 3) short projections, mostly at the "tail" end but also often at both ends. I managed to find something similar in Zotto's folder:
scutula - vitellinus H- > Hymenoscyphus scutula on Impatiens, 5.X.08.jpg
So this is not an unknown feature, I was interested, though, that this was not an occasional occurrence - with careful searching most (of many) spores showed this.
Chris
Hans-Otto Baral,
15-11-2021 16:56
Re : Hymenoscyphus on Rubus
Yes, this is nothing rare. Did you look for the ascus base? Surely without croziers I assume.
You can see them in my Hymenoscyphus menthae paper in H. macroguttatus (figs 32 33 36) and in a species on Vitis (62). In H. vitellinus they tended to be longer. This is quite a difficult group and requires DNA study.
Chris Yeates,
15-11-2021 18:22
Re : Hymenoscyphus on Rubus
Ah wie dumm von mir!
I read through Dennis's and White's papers, but forgot http://www.ascofrance.fr/uploads/forum_file/Baral-2015-Hymenoscyphus-menthae-AscomyceteOrg-07-06-0001.pdf
Thanks Zotto, and yes - as I think I said before - without croziers "H-"